Groove Non Rising Stem Gate Valve
Introduction
The opening and closing part of the non rising stem gate valve is the 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, but cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the commonly used model gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50°, and 2°52'''' when the medium temperature is not high. The gate plate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce slight deformation to improve its craftsmanship and compensate for the deviation of the sealing surface angle during the processing. This kind of gate The plate is called an elastic gate.
Non rising stem gate valve is also called rotating stem gate valve (also called non rising stem wedge gate valve). The valve stem nut is set on the gate plate. The rotation of the handwheel drives the valve stem to rotate, which lifts the gate plate. There is usually a trapezoidal thread at the bottom of the valve stem. The rotating movement is carried out through the thread at the bottom of the valve and the guide groove on the valve disc. It changes into linear motion, that is, the operating torque is changed into operating thrust. When the valve is opened, when the lift height of the gate plate is equal to 1:1 times of the valve diameter, the fluid channel is completely unobstructed, but during operation, this position cannot be monitored. In actual use, the top of the valve stem is used as a mark, that is, the position that does not open, as its fully open position. In order to consider the locking phenomenon caused by temperature changes, the valve is usually opened to the top position and then retracted 1/2 to 1 turn as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (i.e. stroke).
Advantages
Product Specifications
Features
Light weight: The body is made of high-grade ductile black cast iron, which is about 20% to 30% lighter than traditional gate valves and is easy to install and maintain.
Flat-bottomed gate seat: Traditional gate valves often have foreign objects such as stones, wood blocks, cement, iron filings, debris, etc. accumulated in the groove at the bottom of the valve after the pipe is washed with water, which can easily lead to leakage due to inability to close tightly. The bottom of the elastic seat seal gate valve adopts the same flat bottom design as the water pipe machine, which is not easy to cause debris accumulation and allows the fluid to flow smoothly.
Overall rubber coating: The gate uses high-quality rubber for the overall inner and outer coating. Europe's first-class rubber vulcanization technology enables the vulcanized gate to ensure precise geometric dimensions, and the rubber and ductile cast gate are firmly connected and are not easy to fall off and Good elastic memory. water
Precision cast valve body: The valve body is precision cast, and the precise geometric dimensions ensure the sealing of the valve without any finishing work inside the valve body.
Product display
Applications
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