high pressure ball valve Advantages

High pressure ball valve Advantages:
1. Fluid resistance, ball full bore little flow resistance.
2. Simple structure, small size and light weight.
3. Compact and reliable. It has two sealing surface, and  ball valve sealing surface material widely used kinds of plastic, sealing, and can be completely sealed. In the vacuum system it has also been widely used.
4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control.
5. Easy maintenance, simple ball valve, seals are generally activities, the removal replacement is more convenient.
6. In the fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface.
7. Wide range of applications, from small to a few millimeters in diameter, large meters, from high vacuum to high pressure can be applied.
8. Because there are wiping ball in opening and closing process, it can be used with suspended solids medium particles.

Basics of stainless steel ball valve

Just use stainless steel ball valves is rotated 90 degrees operation and a small torque can be closed tightly. The body cavity of full equality for the media provided little resistance, through the flow channel. The main features of valve is its own compact, easy operation and maintenance, stainless steel ball valve can be used to control the flow of air, water, steam, corrosive media, mud, oil, liquid metals and radioactive fluids and other types of media. Ball valve can be integral, it can also be modular. This type valve in the pipe should generally be installed horizontally. Stainless steel instrumentation ball valves Category: stainless steel pneumatic valve, stainless steel electric ball valves, stainless steel ball valves manually. Stainless steel ball valve material is divided into 304,316,321.

Characteristics of trunnion ball valve

Characteristics of trunnion ball valve
1, two-way or three-way design design
2, the use of high-cycle support base spring
3, long cycle life ear bearing
4, without packing
5, manual drive or pneumatic drive
Material: Stainless steel
Connection: thread
Structure: Fixed ball valves
Applications: instrument air piping, sampling, gas and compressed natural gas industries.

the use of high pressure ball valves

In Western countries, industrialized countries, the use of high pressure ball valves is on the increase year by year, in China, the ball is widely used in petroleum refining, long-distance pipelines, chemical, paper, pharmaceuticals, water conservancy, power, municipal, steel and other industries , occupies a pivotal position in the national economy.
The main features of the high-pressure valve is its own compact, reliable sealing, simple structure, easy maintenance, with the spherical sealing surface often in the closed state, not easily be eroded media, ease of operation and maintenance for water, solvents, acids, and natural gas and other general working medium, but also to poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, in various sectors has been widely used. stainless steel ball valves can be integral, it can also be modular.

Stainless steel ball works and valve structure diagram

stainless steel ball valve works
Ball works by rotating the spool to the valve flow or occlusion. Valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, with the spherical sealing surface often in the closed state, the media can not easily be eroded, in various sectors has been widely used.
Stainless steel ball valve structure diagram
Ball and proportional relief valves belong to the same type of valve, only its closure member is a sphere, the sphere rotating around the center line of the valve body to achieve the open, and close a valve.
Valve in the pipeline is mainly used for cutting, distribution and change the direction of media flow. Ball valve is a new valve is widely used.

High pressure ball valve has rapidly developed into one of the main valves

FD-LOK High pressure ball valve came in the 1950s, with the rapid development of science and technology, continuous improvement of production processes and product structure, in just 40 years, it has rapidly developed into one of the main valves.
High-pressure Ball valves is mainly used for cut off or connected line of medium, it can also be used to adjust and control the fluid, which has a strong V-shaped seal between the hard ball with its V-ball core surfacing carbide metal seat shear force, especially for fiber-containing tiny solid granule and other media. The multi-way valve in the pipe can not only control the confluence flexible medium, diversion, and flow switch, but also to close any channel leaving the other two channels are connected. This type valve in the pipe should generally be installed horizontally.

Stainless steel ball valve advantages

FD-LOK stainless steel ball valve advantages:
1, fluid resistance is small, the pipe resistance coefficient equal to the same length.
2, simple structure, small size and light weight.
3. Close and reliable stainless steel ball valves sealing surface material widely used plastic, sealing, and has also been widely used in the vacuum system.
4, easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control.
5, easy maintenance, simple ball valve, seals are generally activities, the removal replacement is more convenient.
6, in the fully open or fully closed, the sealing surface and the dielectric isolation ball and seat, through the media, will not cause erosion of the valve sealing surface.
7, a wide range of applications, from small to a few millimeters in diameter, large meters, from high vacuum to high pressure can be applied.
FD-LOK Ball valves has been widely used in various sectors of petroleum, chemical, power generation, paper, atomic energy, aviation, rockets, as well as people's daily lives.

Pneumatic high vacuum valve has the following advantages:

1, fluid resistance, FD-LOK Trunnion ball valves is the smallest of all valves in a fluid resistance, even reduced diameter valve, the fluid resistance is quite small.
2, valve switch quickly and easily, as long as the stem is rotated 90 °, Ball completed fully on or off action, it is easy to open and close fast.
3, good valve sealing performance. three way ball valves seat seals are generally manufactured using an elastic material such as polytetrafluoroethylene, easy to guarantee the seal, and valve sealing force with increasing media pressure increases.
4, valve stem seals and reliable. When the valve opening and closing the valve stem rotates only, so the stem packing seal can not easily be damaged, and the stem back seal sealing force increases media pressure increases.
5, ball valves open and close only 90 ° rotation, it is easy to achieve automatic control and remote control, stainless steel ball valve can be configured pneumatic devices, electrical equipment, hydraulic equipment, gas-liquid interaction devices or electro-hydraulic linkage.

Pneumatic valve material selection:

1, the metal material; material is a critical factor, such as material properties, creep, thermal expansion coefficient, oxidation resistance, wear resistance, abrasion resistance and thermal heat treatment temperature, which is a matter first of all should pay attention to. At high temperatures, creep and rupture is one of the main factors in material damage, particularly carbon steel, when long-term exposure to 425 ° C above the steel carbide phase may be converted to graphite, and for austenitic stainless steel Only when the carbon content exceeds 0.4%, it can be used more than 528 ° C. Therefore, when used at high temperatures should be calculated separately body material tensile strength, creep, high temperature aging and other parameters. As for the trim design, it should also consider the additional material at high temperature hardness, thermal expansion coefficient with the member, the guide member hot hardness difference, elastic deformation, plastic deformation. In the design, should be given appropriate safety factor and reliability factor to ensure avoidance of damage in a multi-factor generated. And to be familiar with the material under high temperature creep rate to select the appropriate stress, bringing the total creep material within the range of normal life does not extend to allowing it to produce micro cracks or deformation without affecting the normal use of the guide member.
To avoid the pneumatic valve internals (FD-LOK Monoflange needle valve, valve seat) surface abrasion, erosion and cavitation, high temperatures hot hardness of the material to be considered to prevent metal hardness change. In the high differential pressure, most of the energy of the fluid concentrated in trim were released, the inner parts of the valve that might have excessive load, and the high temperature mechanical properties of most materials deteriorate, material softens greatly affect the valve life member. Therefore, the correct choice of appropriate materials, to extend the life of the valve. Also, consider the effect of high temperature aging on the physical properties of materials, such as between toughness and corrosion changes. When the temperature reaches or exceeds the heat treatment temperature, the trim will have annealed, hardness decreased and other issues, in order to prevent changes in hardness of the material, the maximum temperature limit must be selected within a safe range. The same media, at high temperatures, the molecular activity is relatively active, some media have generally corrosive to the body and may trim metal serious corrosion damage, state media with high-speed ion penetration metal interior, so characteristic of the material changes, such as thermal expansion, intergranular corrosion, etc. Therefore, the choice of materials, in addition to cost, should also consider the failure of the multi-factor generated.
High differential pressure at high flow rates, even if the temperature is normal, it should assess the characteristics of the material, and the material to meet the conditions. In general, at room temperature, when the pressure exceeds 15bar, it should spool valve seat material 316 is adjusted to Stellite surfacing alloy or higher requirements, for weak corrosive media, the choice 420QT (quenching and tempering), 440QT like. High differential pressure, high flow rates can lead to serious erosion or cavitation, which is the trim material damage is very large, therefore, the material requirements of the valve body and trim is very high, the spool should consider using stainless steel surface nitriding (HRC70) process, so that it has a strong resistance to erosion, improve accuracy and service life of the valve flow. Oxidation resistance at high temperatures the material, but also a very important parameter. In the temperature cycling, and the choice of materials should avoid repeating material surface oxidation, producing oxide and other issues. Under normal circumstances, the Department of austenitic stainless steel, carbide Department and the Department of special alloy material has good temperature stability, the choice of suitable materials depending on the temperature conditions.
2, non-metallic materials
General non-metallic materials can not withstand high temperatures (300 ° C or more), but flexible graphite can withstand temperatures above 700 ° C, and therefore high-temperature conditions, both static seal or dynamic seal, generally can choose flexible graphite or composite materials, it should be noted that the coefficient of friction increases.

Structure and thermal conductivity of the pneumatic valve component selection:

High temperature and high pressure differential FD-LOK instrument check valve design, it must carefully consider the impact of thermal expansion of the different components of the trim operation. When the high temperature medium flows through the valve, since the coefficient of linear expansion of the valve body is often smaller than the linear expansion coefficient of the valve seat, the valve seat so that the valve body limits the radial expansion of the inner diameter of the expansion valve can only, at a high temperature so that the valve working gap between the core and the valve seat is less than the gap between the standard design at room temperature, resulting trim stuck. Spool and the guide sleeve will produce the same phenomenon. Thus, when the valve used in high temperature, room temperature design space standard valves (including inter-valve, valve seat; guide sleeve, between the stem) should be appropriately increased, so that it will not work stuck phenomenon occurs at high temperatures . Therefore, the gap design is very important because confirm material, size and temperature parameters on poor design staff is very important, at present, the corresponding data can be obtained from "ASME Boiler and Pressure Vessel Code Material D Part Ⅱ Performance" in.
Request a higher amount of leakage occasions valve and valve seat as far as possible the same alloy steel, and a single seat or cage structure, try to avoid using the valve seat structure, but also in the sealing surface hardening process, so as to avoid high temperature dramatically increasing the amount of valve leakage. It should also consider the body, bonnet and connectors withstand damage caused due to the additional load caused by high temperatures.
Cyclic changes in temperature cause the seat and the guide sleeve is loose, it must be sealed lap welding and welding to locking or clamping structure. Seat gasket seal is greater than the yield limit gasket sealing force to be able to get, but at a high temperature, high pressure and thermal cycling conditions, the sealing material creep arising from leakage, the seat can be used as a whole, by a valve made directly on the body and hardened valve seat. For large diameter valves, welding seat on the body, removing shims to avoid unnecessary leaks. Depending on the temperature level of the medium, but also consider the stuffing box packing can withstand temperatures and actuators can withstand temperatures.

Fully welded ball valve installation:

1, the valve lifting. Lifting should be the right way valve, in order to protect the valve stem, do not sling tied to the hand wheel, gear box or actuator. Protective cap sleeves at both ends of the valve not removed prior to welding.
2, the valve welding process. Buried fully FD-LOK Mini needle valve and trunk pipeline connection to take welding. Weld quality must meet the "disc flexor fusion welded joints radiography" (GB3323-2005) Ⅱ grade sheet standard, usually once a weld does not fully ensure that all qualified, so when ordering valves at both ends of the valve should require manufacturers to increase 1.0m long sleeves, welds failed once there is enough length to cut off defective weld and re-welded ball valve and pipe welding time, the valve should be at 100% full open position, so as not to damage the valve ball welding slag splashing, while ensuring internal valve seal temperature up to 140 degrees Celsius, cooling can take appropriate measures when necessary.
3, install valve well cast. FD-LOK bellows seal valves using a special design, with maintenance-free features, buried on the outside of the valve before coating Pu special anti-corrosion coating, while the three were urgent grease the seat and stem injection tubes, Cavity appropriate to extend the vent pipe and valve stem according to Huang to depth, so that staff can be on the ground to complete the operation. To achieve buried after laying a small hand valve shaft can be, and for conventional non-welded ball valve can not be directly buried, and need a large masonry valve well, the result is the formation of a dangerous confined space, is not conducive to safe operation . At the same time the body itself and the bolt body and the pipe joints will be electrical corrosion, affecting the life of the valve.

American Standard ball rolling thread less susceptible to shear forces and require less friction torque.

Rolling Thread can also benefit long-term. To save space parallel to the valve can be made compact, short structure. These three way ball valves are sometimes referred to as "clip-gate" in this, "WAFER", is used to mean "thin." These valves are not as literal as lazy thinking sandwiched between two pipe flanges. But the flange machined directly on the boring body length of the valve is reduced. Flange simply refers flange, stud or bolt and nut with two nuts can not be used.
For those who have not may disassemble the valve assembly, the American Standard ball valve connecting surface can be equipped with studs, you must use the substitutability of bolts.

Floating ball valve

The FD-LOK High pressure ball valve is floating at medium pressure, the ball can produce a certain displacement and pressed on the sealing surface of the outlet end, to ensure that the outlet end seal.
Simple floating ball valve structure, good sealing, but the ball all bear the load of the working medium to pass the exit ring, so to consider the ring material can withstand the work load media sphere. This structure is widely used in the low-pressure valve.

Fixed ball valve

The FD-LOK high pressure ball valves manufacturers is fixed, no movement after compression. Fixed ball valve comes with a floating valve seat, by medium pressure, the valve seat to move, so that seals pressed onto the ball, in order to ensure the seal. Usually with the ball, the lower shaft with bearings, operating torque, suitable for high pressure and large diameter valves.
To reduce the valve operating torque and increase the reliability of the seal, valve seals in recent years has emerged, both pressure injection of a special lubricant between the sealing surface to form a layer of film that enhances the tightness, but also reduce operating torque more suitable large diameter FD-LOK High pressure ball valve

Elastic ball valve

The ball valve is elastic. FD-LOK Ball valves seat rings are metal materials, sealing pressure than the large, rely on the pressure medium itself has reached less than the requirements of the seal, must apply force. This valve is suitable for high temperature and high pressure medium.
Elastic sphere is a sphere at the lower end wall to open a resilient groove, and access flexibility. When closing the channel, with the stem of the wedge-shaped head with the ball to open up the valve seat seal. Loosen before turning the ball first wedge-shaped head, the ball along with restoration of the original prototype, make small gap, sealing surface can reduce friction and operating torque between the ball and seat.
Ball can be divided according to their channel positions straight-through, tees and right angle. After Instrumentation ball valves for dispensing the media and change the flow of the medium.

Instrument valve

Instrument valve manifolds valve is a pipeline accessory. It is used to change the channel section and flow direction of medium, control of a device for conveying medium flow.  The sealing performance of Instrument manifolds valve instrument valve refers to the part of the sealing ability to prevent media leaks, it is the technical performance index of instrument valve is the most important. Sealing parts instrument valve has three parts: opening and closing parts at the contact and valve seat sealing surface between the two; filler stem and the stuffing the distribution and office; valve connection with the valve cover. The first one is called the leak within the leak, which is usually known as Guan lax, it will affect the ability of instrument valves truncated medium. For the truncated valve, the internal leakage is not allowed. Leakage after the two called the leakage, that media leaks from the valve to the valve outside. Leakage will result in material loss, pollution of the environment, can also cause serious accidents. The explosive, toxic or radioactive medium, leakage is allowed, and thus the instrument valve must have a reliable sealing performance.

The main features of Stainless steel needle valve

Stainless steel needle Instrument valve in the closed position, the valve is still there inside the pressurized fluid prior to maintenance, lift the front line pressure Instrument needle valve in the open position Instrument manifolds and make repairs before disconnecting the power or gas supply service, the actuator and bracket must first check out on the next ball, after removing the pressure downstream pipeline has indeed only exploded assembly operation and care must be taken to prevent damage to the decomposition of the sealing surface again when the parts assembly, especially the non-metallic parts. Stainless steel needle valve seal reliable, simple structure, easy maintenance, regular spherical surface and seal in the closed state, the media can not easily be eroded, easy operation and maintenance for water,Double ferrule fitting solvents, acids, and natural gas work in general media, and Stainless steel needle valve is also suitable for harsh working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, etc., in various sectors has been widely used. Widely used in petroleum refining, long-distance pipelines, chemical, paper, pharmaceutical, water, electricity, municipal, steel and other industries.

Stainless steel needle valve of the course

Stainless steel needle valve refers to the amount of relying on its own motion and automatic referral opening and closing the valve, check valve lift amount has stopped mediated backflow valve. Check valves are an automatic valve, its tail to be mediated by impulse is to stop the amount back, stop the pump and drive motor reversal,High pressure ball valve the war put a container full amount of referrals. Stainless steel needle valve refers to the amount of relying on its own motion and automatic referral opening and closing the valve, check valve lift amount has stopped mediated backflow valve. Check valves are an automatic valve, its tail to be mediated by impulse is to stop the amount back, stop the pump and drive motor reversal, Valve manifolds the war put a container full amount of referrals. Stainless steel needle valve of the valve disc-shaped, around the shaft for rotational movement of the seat channel, due to internal valve passage into a streamlined, smaller than a liter of active resistance butterfly valve for low flow rates and infrequent events changes in large-caliber place, but not for pulsatile flow, the sealing performance is less than lift.

Stainless steel needle valve exterior feature presentation

Stainless steel needle valve simple structure, small size, resistance to fluid flow is small, the disadvantage is turned on or off too quickly, it will produce water hammer (when a sudden change in the flow velocity in the pipe pressure will rise) in the pipeline.Instrument needle valve Therefore should not be used in the main pipe valve, available in dry, or the end of the branch pipe for wash-use, flushing sewage effect. Including the development of iron and steel, sealing materials, and mechanical processing industries will have a significant impact on the level of technical parameters of the valve. Stainless steel needle valve of strength, ductility,High pressure ball valve corrosion resistance, resistance to high pressure directly affects the valves, corrosion resistance; production level determines the valve sealing material applicable to medium and can withstand the pressure; precision machining is the impact of the interface seal, the valve head and an important factor in seating levels.

Stainless steel needle valve structure in the form of presentation

Stainless steel needle valve pneumatic device safe, reliable, low cost, easy maintenance, the structure of the valve drive a big branch. World Valve Network Xiaobian for you Instrument needle valves in detail the structure of the valve pneumatic device technology requirements and performance requirements for reference. Structural technical requirements valve pneumatic device: the pneumatic cylinder by means opening indication, stroke limit, pneumatic components, manual mechanism, signal feedback and other components. Pneumatic device with a buffer mechanism, the stroke length of the buffer mechanism can refer to Table l requirements. Buffering mechanism with adjustable pneumatic devices, there should be external to adjust its buffer cylinder body. Stainless steel needle valve with Instrument valve manifolds manual mechanism in the gas supply is interrupted, the valve should open and close operations can be performed manually institutions, while facing the hand wheel, hand wheel or handle counterclockwise rotation of the valve should open the valve clockwise turn off. Rod ends for the inner and the outer thread, there should be a standard spanner wrench applicable mouth. Piston seals should be easy to replace and repair. Stainless steel needle valve when the main line in the pipeline and gas pipeline buried in the ground in the need, the need to use full bore welded ball valve.(Double ferrule fitting)  in the wider application of irrigation systems, mainly used in the branch entrance. Ball simple structure, small size, resistance to fluid flow is small, the disadvantage is turned on or off too quickly, it will produce water hammer (when a sudden change in the flow velocity in the pipe pressure will rise) in the pipeline. Therefore should not be used in the main pipe valve, available in dry, or the end of the branch pipe for wash-use, flushing sewage effect.

Stainless steel needle valve is the instrument to measure the pipeline system is an important part of

Its function is turned on and off the pipeline path. Good sealing needle valve, needle Instrument needle valve long service life, even after the needle valve sealing surface damage, needle valves only need to replace wearing parts, needle valves can continue to use.Needle valve should be installed so that the flow is consistent with the direction of the arrow on the valve body medium. Needle valves are often used with pressure transmitters, (Trunnion ball valves) flow meters and other ancillary equipment. Stainless steel needle valve is used to adjust the carrier gas flow rate, and some instruments use it to control the flow of gas and air. Adjustment handle on a connection in a straight shaft, which stem in the lower end of the shaft that was pointed cone valve needle 5, by changing the relative position of the valve needle valve to control the flow. When adjusting the handle rotated in a counterclockwise direction,(Instrument needle valve) the gap increases with the valve needle valve, gas resistance decreases, thus increasing the outflow from the needle valve gas flow. When adjusting the handle is turned clockwise, the valve needle valve seal will hold him down, the needle valve is closed. Embed a fluorine rubber gasket groove in the middle of the stem. I.e., the seal ring 4, and its surface is coated with silicone vacuum grease, the stem moves when the seal ring is always in close contact with the inner wall of the valve body, the valve body to maintain a sealed state when the needle valve is not working, the needle valve should be full (this point and the regulator valve opposite) to prevent the valve needle stuck in the valve inlet seal also prevents the spring prolonged pressure and failure.

Fixed ball valve

Fixed ball Instrument valve, is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipeline, its strength, safety, resistance to harsh environments and so on in the design of special consideration, suitable for all kinds of corrosive and non corrosive media. It is compared, and the floating ball work force, fluid pressure before the Instrument valves is generated in the sphere of all transferred to the bearing, not to move the ball to the seat, which seat would not put too much pressure, so the torque of the fixed ball valve seat seal small, small deformation, stable performance, long service life, suitable for high pressure, large caliber occasions. Advanced spring pre seat assembly, self tight characteristic, and the upstream seal. Each valve has two valve seats, each direction can be sealed, so the installation does not restrict the flow is bidirectional. This valve is usually installed horizontally.
Fixed ball valve has two style and three type two body structure, the flange bolts, sealed with PTFE inserts into the stainless steel ring, steel ring is arranged at the rear part of the spring to ensure the seat close to the ball, keep the seal. The upper and the lower valve rod are provided with PTFE bearings, reducing friction, labor-saving operation, a small shaft bottom is provided with an adjusting plate, ensure the ball and the sealing ring is connected with a position. Full size: the valve flow aperture consistent with the pipeline diameter, for pipeline cleaning.

High pressure ball valve

High pressure ball valve is rotated 90 degrees with the action, the cock body is a sphere, a circular through-hole or channel through its axis. The direction of the flow valve in the pipeline is mainly used to make cutting, changes in media distribution, it only needs to rotate 90 degrees rotation of the operation and a small torque can be closed tightly. The most suitable valve do switch, shut-off valve, but the recent development has been designed so that it has a throttle valve and flow control purposes, such as V type ball Instrument needle valve.
The main features of high pressure of the valve itself is compact in structure, reliable sealing, simple structure, convenient repair, sealing surface and spherical often in the closed state, can not easily be medium erosion, easy to operate and repair, and is suitable for water, solvents, acids and natural gas general working media, but also applies to poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, widely used in various industries. Ball valve can be integral, it can be modular.
The advantages of high pressure ball valve:
1 fluid resistance small, full bore ball valve little flow resistance.
2 has the advantages of simple structure, small volume, light weight.
3 close and reliable. It has two sealing surface, and the current valve sealing surface material is widely used in all kinds of plastic, good sealing performance, and can be completely sealed. In the vacuum system has also been widely used.
4, the operation is convenient, quick open and close, from fully open to fully closed as long as the rotation of 90 DEG, facilitate remote control.
5 ball valve has the advantages of simple structure, convenient maintenance, seals are generally activities, the removal of the replacement is more convenient.
6 in the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, through the media will not cause erosion of the valve sealing surface.
The 7 is suitable for a wide range, from small diameter to a few millimeters, a few meters from the large, high vacuum high pressure can be applied.
8 because the ball in the opening and closing process of wiping, it can be used with suspended solid particles of the medium.

The classification of ball valve

One, floating ball valve
Ball Valve manifolds ball is floating in the medium under pressure, can produce some displacement of the sphere, and pressed in the export side of the sealing surface, to ensure that the exit seal. Floating ball Valve manifolds structure is simple, good sealing, but the ball under the load of all media work to export ring, so to consider the ring material can withstand the work load of the media sphere. This structure, widely used in low-pressure valve.
Two, fixed ball valve
The ball valve is fixed, no movement after compression. Fixed with a floating ball valve ball valve seat, by the media pressure, the valve seat have a mobile, so that the sealing ring is pressed on the sphere, in order to ensure the sealing. Usually with the ball in the upper and lower shaft with bearings, operating torque, suitable for high pressure and large diameter of the valve. In order to reduce the valve operating torque and increase the reliability of the seal, valve seal has emerged in recent years, both pressure lubricating oil special note in the sealing surface, to form a layer of oil film, which enhances the sealing, and reduce operating torque, more suitable for large-diameter high-pressure valve.
Three, elastic ball valve
The ball valve is flexible. Ball and valve seat rings are made of metal materials, sealing pressure than the large, rely on the media itself can not seal the pressure has reached the requirements must be imposed by external forces. This valve is suitable for high temperature and high pressure medium. Elastic sphere is a flexible open slot in the sphere of the bottom wall, and get flexible. When the closed channel, with the stem of the wedge-shaped head to open up the ball with the valve seat to seal compression. In the rotating sphere before loose wedge head, ball the subsequent restoration of the original prototype, so that a small gap between the ball and the valve seat sealing surface can reduce friction and operating torque.

Trunnion ball valve preservation method described

Trunnion ball valve body's first anti-corrosion, the main choice of stainless steel, carbon steel. Although anti-corrosion materials is very rich, but whether the election was appropriate or not an easy thing, because the corrosion problem is very complex.Valve manifolds Choose body material difficulties, lies not only consider the corrosion problem, but must consider the ability to withstand temperature, whether economically justified, is it easy to buy and other factors. Followed Trunnion ball valve liner take measures, such as lead-lined, Instrument needle valve lining aluminum, plastic lining, the lining of natural rubber and synthetic rubber and the like. The medium conditions permit, This is an economical way. Again, under pressure, the temperature is not high,Check valve made with non-metallic valve body materials can often be very effective corrosion prevention and control. In addition, Trunnion ball valve has an outer surface exposed to atmospheric corrosion, general steel materials to paint to protect.

Features Trunnion ball valve is constructed

Trunnion ball valve stem through the flat keys or splines or square convergence deed with the handle, versatile,Trunnion ball valve convenient disassembly. Stainless steel ball valve stem with anti-blown construction. High-pressure valve packing selection knitting, flexible graphite seals or tetrafluoroethylene-ene ring, so that to achieve robust stainless steel ball valve stem seals must be smooth in the case. Based on need, high-pressure valve can be planned into the anti-static structure, providing a conductive spring between the ball and the Double ferrule fitting stem and the valve, to prevent static sparking extinguish flammable materials to ensure system safety. Trunnion ball valve seal vice situation varied. Trunnion ball valve task truth is by reversing valve love to make valve dredge or occlusion. Valve switch light, small size, can be made very large caliber, reliable sealing, simple structure, convenient maintenance,(Instrument needle valve) regular spherical surface and seal in the closed condition, can not easily be eroded media, in all sectors lost universal use.

Trunnion ball valve elastic ball valve

The ball valve is elastic. Ball and seat ring are made ??of metal materials, sealing pressure than large, rely on the media itself has reached less pressure sealing requirements must apply force. This valve is suitable for high temperature and pressure medium. Elastic sphere is the sphere in the lower end of the inner wall of the opening of a resilient groove, Instrument valve and access flexibility. When closing the channel, wedge-shaped head with a stem so that the ball up on and the valve seat seal. Before turning the ball first release wedge-shaped head, the ball followed by restoration of the original prototype, so there is very small gap sealing surface can reduce friction and operating torque between the ball and the valve seat. Ball position can be divided according to their straight-channel, three-way and the right angle. After two ball valves for dispensing media and change the flow of the medium. Ball O-Ball and V-ball points. O type ball floating structure, ball core for precision castings, hard chrome plated exterior,Double ended cylinder seat with PTFE material, the same stream crossings and pipe diameter, maximum flow capacity, flow resistance is extremely small, closed without leakage, generally do switch valve, especially suitable for high viscosity, fibrous, granular media; V-ball with a fixed structure, opened a V-notch ball core, can achieve proportional control, flow characteristics such as the approximate percentage. Depending on the choice of process equipment pneumatic or electric actuators, pneumatic valve and were composed of electric valve, which pneumatic valve as required to achieve the proportional control valve with positioner, electric valve as required to achieve the selected electronic proportional control electric actuator or with servo amplifiers.

Advantages of manual ball valve

High pressure needle valve is a relatively new type of ball category , it has its own unique structure of some advantages, such as switches without friction , sealing easy to wear, a small opening and closing torque . Such actuators can be reduced with the specifications. With multi-turn electric actuators , can be realized on media regulation and tight cut . Widely used in petroleum, chemical, water supply and drainage and other cities demanding cutting conditions.
Manual valve in the pipeline is mainly used for cutting, distribution and change the flow direction of the medium. Ball is a new type of valve is widely used in recent years , it has the following advantages:
1 . Fluid resistance , its drag coefficient with the same pipe length equal.
2 . Simple structure, small size, light weight.
3 . Close and reliable valve sealing surface material widely used plastic , sealing, has also been widely used in the vacuum system .
4 . Easy to operate, opening and closing rapidly , from fully open to fully closed as long as the rotation of 90 °, to facilitate remote control .
5. Easy maintenance , simple High pressure ball valve, seals are generally activities , removal replacement is more convenient.
6. When fully open or fully closed, the sealing surface and the dielectric isolation ball and seat , through the media , will not cause erosion of the valve sealing surface.
7 . Wide range of applications , from small diameter to a few millimeters to a few meters from the high vacuum to high pressure can be applied . When the ball is rotated 90 degrees , in the import and export of office should be fully rendered sphere , thus cutting off the flow.

Instrument valve

Instrument valve manifolds valve is a pipeline accessory. It is used to change the channel section and flow direction of medium, control of a device for conveying medium flow.  The sealing performance of Instrument manifolds valve instrument valve refers to the part of the sealing ability to prevent media leaks, it is the technical performance index of instrument valve is the most important. Sealing parts instrument valve has three parts: opening and closing parts at the contact and valve seat sealing surface between the two; filler stem and the stuffing the distribution and office; valve connection with the valve cover. The first one is called the leak within the leak, which is usually known as Guan lax, it will affect the ability of instrument valves truncated medium. For the truncated valve, the internal leakage is not allowed. Leakage after the two called the leakage, that media leaks from the valve to the valve outside. Leakage will result in material loss, pollution of the environment, can also cause serious accidents. The explosive, toxic or radioactive medium, leakage is allowed, and thus the instrument valve must have a reliable sealing performance.

Stainless steel needle valve of the course

Stainless steel needle valve refers to the amount of relying on its own motion and automatic referral opening and closing the valve, check valve lift amount has stopped mediated backflow valve. Check valves are an automatic valve, its tail to be mediated by impulse is to stop the amount back, stop the pump and drive motor reversal,High pressure ball valve the war put a container full amount of referrals. Stainless steel needle valve refers to the amount of relying on its own motion and automatic referral opening and closing the valve, check valve lift amount has stopped mediated backflow valve. Check valves are an automatic valve, its tail to be mediated by impulse is to stop the amount back, stop the pump and drive motor reversal, Valve manifolds the war put a container full amount of referrals. Stainless steel needle valve of the valve disc-shaped, around the shaft for rotational movement of the seat channel, due to internal valve passage into a streamlined, smaller than a liter of active resistance butterfly valve for low flow rates and infrequent events changes in large-caliber place, but not for pulsatile flow, the sealing performance is less than lift.