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The movement mode of the gate valve
- Categories:Industry Knowledge
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- Time of issue:2016-01-15 14:40
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(Summary description)Thegatevalveisagateforopeningandclosing.Themovementdirectionofthegateisperpendiculartothedirectionofthefluid.Thegatevalvecanonlybefullyopenedandfullyclosed.Theparametersofthegatevalvevary,usually5°,wh
The movement mode of the gate valve
(Summary description)Thegatevalveisagateforopeningandclosing.Themovementdirectionofthegateisperpendiculartothedirectionofthefluid.Thegatevalvecanonlybefullyopenedandfullyclosed.Theparametersofthegatevalvevary,usually5°,wh
- Categories:Industry Knowledge
- Author:
- Origin:
- Time of issue:2016-01-15 14:40
- Views:
Information
The gate valve is a gate for opening and closing. 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. The parameters of the gate valve vary, usually 5°, when the medium temperature is not high. It is 2°52'. Improve its manufacturability and make up for the deviation of the sealing surface angle during processing. This kind of gate is called an elastic gate.
The movement mode of the gate valve
When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, only rely on the medium
The pressure presses the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, the gate must be forced against the seat by external force to ensure the sealing performance of the sealing surface.
Movement mode: The gate of the gate valve moves linearly with the valve stem, which is also called the rising stem gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed 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 is equal to 1:1 times the valve diameter, the fluid passage is completely unblocked, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as the mark, that is, the unmovable position, as its fully open position. In order to take into account the locking phenomenon caused by temperature changes, it is usually opened to the top position, and then rewind 1/2-1 turn, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate (that is, stroke). Some gate valve stem nuts are installed on the gate, and the rotation of the handwheel drives the rotation of the valve stem to lift the gate. This kind of valve is called Rotating stem gate valve or dark stem gate valve.
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