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.