![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
The basic principles of American Standard valve has the following two procedures: I. American Standard valve opening procedures: 1 until the fully open position, the valve stem to the limit position, the ball rotates to the fully open position. 2 In the closed position, the valve body is pressurized by the stem's [...] mechanical action and pressed against the seat. 3 When the handwheel is turned counterclockwise, the stem moves backwards and the bottom angled plane disengages the ball from the seat. 4 The stem continues to lift and interact with the guide pin in the helical groove of the stem to allow the ball to spin without friction. II. American Standard Gate Valve Closing Procedure: 1 The last few turns of the handwheel, the angular plane at the bottom of the stem mechanically wedges the ball and presses it tightly against the valve seat to achieve a complete seal. 2 When closed, turn the handwheel clockwise, the stem begins to descend and the ball leaves the seat and begins to rotate. 3 Continue to rotate the handwheel and the stem is guided by the guide pin embedded in the helical groove on it, causing the stem and gate to rotate 90 ° at a time. 4 When it is about to close, the body has rotated 90 ° without contact with the seat.