The working principle of three-way ball valve is to rotate the valve love to make the valve open or closed. Ball valve switch lightweight, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and the ball surface is often in the closed state, is not easy to be eroded by the media, in various industries have been widely used.
Three-way ball valve in the pipeline is mainly used to do cutting, distribution and change the direction of flow of media. Three-way ball valve is a relatively new type of ball valve category, it has its own structure unique to some of the advantages, such as switching without friction, sealing is not easy to wear, opening and closing torque is small. This can reduce the specifications of the matching actuator.
Three-way ball valves have T-type and L-type. T-type can make three orthogonal pipeline interconnection and cut off the third channel, play the role of shunt, merge. L-type three-way ball valves can only be connected to each other orthogonal to the two pipelines, can not keep the third pipeline at the same time connected to each other, and only play the role of distribution.
1, three-way ball valve in the structure of the integrated structure, 4-sided seat sealing type, less flange connection, high reliability, design to achieve a lightweight
2、Three way ball valve has long service life, large flow capacity and low resistance.
3, three-way ball valve according to the role of single-acting and double-acting two types, single-acting type is characterized by once the power source failure, the ball valve will be in the control system requirements of the state
Ball valves and gate valves are the same type of valve, the difference is that its closing member is a sphere, the sphere around the center line of the valve body for rotation to achieve open, close a valve. Ball valve in the pipeline is mainly used to do cut off, distribution and change the direction of flow of media. Ball valves are widely used in a new type of valve, it has the following advantages:
a. Fluid resistance is small, and its resistance coefficient is equal to that of the pipe section of the same length.
b. Simple structure, small volume, light weight.
c, tight and reliable, the sealing surface material of the ball valve is widely used plastic, good sealing, in the vacuum system has also been widely used. 4.
d, easy to operate, open and close quickly, from fully open to fully closed as long as the rotation of 90 °, to facilitate remote control.
e, easy maintenance, ball valve structure is simple, the sealing ring is generally active, disassembly and replacement are relatively convenient.
f, in fully open or fully closed, the ball and seat sealing surface and media isolation, media through, will not cause valve sealing surface erosion.
g, a wide range of applications, from small diameter to a few millimeters, up to several meters, from high vacuum to high pressure can be applied.
2、Working principle
A. Opening process
a, in the closed position, the ball by the valve stem mechanical pressure, tightly pressed on the valve seat.
b. When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and the angular plane at the bottom of the valve makes the ball disengage from the valve seat.
c. The valve stem continues to lift and interacts with the guide pin in the spiral groove of the valve stem so that the ball begins to rotate without friction.
d. Until it reaches the fully open position, the valve stem lifts to the limit position and the ball rotates to the fully open position.
B. Closing process
a. When closing, rotate the handwheel clockwise, the valve stem will start to descend and make the ball leave the valve seat and start to rotate.
b, continue to rotate the handwheel, the valve stem is embedded in the role of the guide pin in the spiral groove, so that the valve stem and the ball at the same time rotated by 90 °.
c. When the valve is about to close, the ball has rotated 90° without contact with the seat.
d, the last few turns of the handwheel rotation, the bottom of the valve stem angular plane mechanically wedge to the compression of the ball, so that it is tightly pressed on the valve seat, to achieve complete sealing.
3、Precautions for installation and maintenance
a, to leave the valve handle rotation position.
b, can not be used as a throttle.
c. The ball valve with transmission mechanism should be installed upright.