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2014年10月30日星期四
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.
2014年5月8日星期四
Advantages of manual ball valve
Manual ball 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.
Trunnion ball valves 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 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.
Trunnion ball valves 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 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.
2014年4月24日星期四
Trunnion ball valves
Two-axis ball belongs to the high-pressure Trunnion ball valve series, the compact features of the structure of the valve, appearance, maximum flow rate, low operating torque, enabling 2-way and 3-way path, enabling the panel installation, enabling pneumatic and electric actuators, important about seeking law instructions, ball unused for some time may have a higher initial torque to open all series ball valves are bi-directional test using nitrogen at the factory. The maximum allowable leakage test pressure the ball for the simple task can not be detected leaks.
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