Gate valve is a kind of valve for medium connection and shut- off but not suitable for regulating. Compared with other valves, gate valves have a wider range of combined applications for pressure, service fluid, design pressure and temperature. According to the screw position of the stem, the gate valve can be divided into rising stem gate valves and Non-rising stem gate valve (NRS).
Stem nut for open stem gate valve is on its cover. Rotation of stem nut drives stems up and down when opening or closing gate valve. It opens and closes the disc connected to the stem by lifting or lowering the thread between the handwheel and the stem and fully open position does not disrupt the flow. This design is favorable to the lubrication of the valve stem and has been widely used. The wedge is rubber coated and It is not used as a check valve and flow rate adjustments.
The advantages disadvantages of rising stem gate valve:
Non-Rising Stem means outside stem, also referred to as the rotary stem gate valve or blind stem wedge gate valve. In an NRS valve, the stem will turn to open and close the gate, but the stem does not move up or down as it turns. As the stem turns, it moves into or out of the valve, which also moves the gate to open or seal the valve.
The advantages and disadvantages of non-rising stem gate valve:
What’s the difference between rising stem gate valve and non-rising stem gate valve?
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