Valve Construction

- Apr 18, 2017-

The headstock mechanism comprises the disc (also called the valve disc, spool), the stem and the driving device (handwheel). trapezoidal screw threads screw on the bonnet, handwheel and disc are fixed at the bottom and lower ends of the stem, turn the wheel, the stem can be raised or landed to drive the disc close or out of the seat to close and open, and the disc is closely matched with the seat, and the valve is pressed against the valve stem to tighten the valve on the seat, when the valve is completely shut down, and the valve is strictly not leaking.