Nkz41h Power Plant Steam Turbine Flanged Vacuum Gate Valve

NKZ41H Power Plant Steam Turbine Flanged Vacuum Gate Valve
NKZ41H (NKZ44H) Power Plant Steam Turbine Flanged Vacuum Gate Valve Description:
The valve body adopts traditional exterior design, reasonable design, good valve rigidity, smooth channel, and small flow resistance coefficient.
The sealing surface is made of stainless steel and hard alloy and has a long service life.
Filler with flexible PTFE, reliable sealing, light and flexible operation. .
The internal and external surfaces of the carbon steel valve are treated with corrosion protection.
Widely used in petrochemical, thermal power plants and other oil products, steam pipe online.

The vacuum gate valve is improved by ordinary manual gate valve. The difference is that the vacuum gate valve is equipped with a vacuum seal ring at the filling seal, which has self-expanding compaction effect. Better sealing performance than ordinary gate valves. The opening and closing part of the vacuum gate valve is a gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and it cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valves form wedges, and the wedge angle varies with the valve parameters, typically 5°, and 2°52′ when the medium temperature is not high. When the vacuum gate valve is closed, the sealing surface can only be sealed by means of the medium pressure, ie, the seal surface of the gate plate is pressed against the valve seat on the other side by the medium pressure to ensure the sealing of the sealing surface. This is self-sealing. Most of the gate valves are forcibly sealed, that is, when the valve is closed, it is necessary to force the gate plate against the valve seat by external force to ensure the sealing of the sealing surface. The gate of the vacuum gate valve makes a linear movement with the valve stem and is called a lifting rod gate valve (also called a bright rod gate valve). Trapezoidal threads are usually formed on the lifting rods. The nut on the top of the valve and the guide groove on the valve body convert the rotation into linear motion, that is, the operating torque becomes the operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 of the valve diameter, the channel of the fluid is completely open, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a mark, that is, a position that does not move, as its fully open position. To account for temperature changes in the phenomenon of lock-up, usually in the open to the top position, and then back 1/2 - 1 lap, as a fully open valve position.