You don’t even know about gate valves
Introduction of gate valve
The opening and closing part of the gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.
Gate valve construction
It is generally composed of valve body, valve seat, valve stem, gate plate, valve cover, and sealing ring. It can be transformed into a variety of electric gate valves and pneumatic gate valves by equipping the transmission device and gate valve.
The difference between rising stem gate valve and dark stem gate valve：
The open stem gate valve is different from the dark stem gate valve in terms of transmission mode. The open stem gate valve is driven by the handwheel to rotate the nut in situ, and the valve stem rises and falls in a straight line to complete the switch; for the dark stem gate valve, the handwheel drives the valve stem to rotate. The thread (equivalent to a nut) moves up and down to complete the switch.
- The open rod gate valve can see the lead screw, but the dark rod can not see the lead screw;
- The open stem gate valve lifts or lowers the valve disc through the threaded transmission of the valve stem and the steering wheel; the dark stem gate valve is connected with the steering wheel and the valve stem when it is switched on and off, and it is rotated by the valve stem at a fixed point. Drive the valve disc to lift up and down to complete the opening and closing;
- The transmission thread of the dark stem gate valve is located inside the valve body. During the opening and closing process, the valve stem only rotates, and the gate moves up and down in the valve body; the stem of the open stem gate valve drives the gate to rise and fall together, and the The drive thread is outside the valve body, and the opening and closing and position of the gate can be visually judged according to the movement direction and position of the valve stem;
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