Gate valve product series Cast steel flange gate valve Shoulong gate valve Cast steel flange gate valve Introduction
Gate valve refers to a valve whose closing member moves in the vertical direction along the center line of the passage. The gate valve can only be fully opened and fully closed in the pipeline and cannot be adjusted or throttled. The gate valve is a kind of valve that is widely used. It is used for cutting devices with general diameters. Sometimes gate valves are also used for cutting devices with small diameters
The gate has two sealing surfaces. Two of the most commonly used wedge gate valves are The wedge angle formed by the sealing surface varies with the valve parameters, usually when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, which is 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 is called an elastic gate. .
When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate plate to the valve seat on the other side to ensure the sealing surface sealing, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, external force is required to force the gate plate to the valve seat to ensure the sealing performance of the sealing surface.
A gate valve whose gate plate moves linearly with the valve stem is called a lifting rod gate valve. Usually there is a trapezoidal thread on the lift rod that changes the rotational motion into linear motion through the nut on the top of the valve and the guide groove on the valve body, that is, the operating torque is converted into operating thrust.
When the valve is opened, when the lift height of the gate plate is equal to times of the valve diameter, the fluid channel is completely unobstructed, but this position cannot be monitored during operation. In actual use, the top of the valve stem is used as a mark, that is, the position that does not open is used 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 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).
Cast steel flange gate valve parameters
Product model
Product diameter
Product pressure
Product material: cast steel
Used medium: water, oil, steam, gas, etc.
Cast steel flange gate valve