果冻久久尤物

US standard bevel gear cut valve J541W

American Standard cut-off valve in the pipeline is mainly used for cutting, distribution and change the flow direction of the medium. American Standard cut-off valve is widely used in recent years, a new type of valve, which has the following advantages:

1. The fluid resistance is small, the resistance coefficient and the same length of the pipe segment equal.

2. Simple structure, small size, light weight.

3. Close and reliable, the current valve sealing surface material widely used plastic, sealing, and in the vacuum system has also been widely used.

4. Easy to operate, open and close quickly, from full open to fully closed as long as the rotation 90 °, easy remote control.

5. Easy maintenance, gate valve structure is simple, the seals are generally active, the demolition of replacement are more convenient.

6. In the fully open or fully closed, the ball and seat sealing surface and medium isolation, the media through, it will not cause corrosion of the valve sealing surface.

7. Wide range of applications, from small to a few millimeters in diameter, large to a few meters, from high vacuum to high pressure can be applied, the ball rotated 90 degrees, in the import and export should be spherical all appear to cut off the flow.

working principle

A, the opening process

1 In the closed position, the valve body is pressurized by the valve stem and pressed against the valve seat.

2 When the handwheel is turned counterclockwise, the stem moves in the opposite direction, and the bottom angular plane causes the ball to disengage from the seat.

3 The stem continues to lift and interact with the guide pins in the stem groove, causing the sphere to start rotating without friction.

4 until the fully open position, the valve stem lifted to the limit position, the ball rotated to full open position.

B, close the process

1 When closed, rotate the handwheel clockwise, the stem begins to descend and the sphere begins to rotate away from the seat.

2 continue to rotate the hand wheel, the stem is embedded in its spiral groove on the role of the guide pin, so that the stem and the gate at the same time rotating 90 °.

3 is about to close when the gate has no contact with the valve seat in the case of rotation 90 °.

4 The last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the ball and presses it tightly against the valve seat for complete sealing.