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Low temperature flange gate valve

Label: low temperature flange gate valve: Wenzhou low temperature flange gate valve: stainless steel low temperature flange gate valve added time: May 25, 2021 click 72 second

 Low temperature flange gate valve

low temperature Gate valve According to the sealing surface configuration, it can be divided into wedge gate valve and parallel gate valve. Wedge gate valve can also be divided into single gate pole type, double gate plate type and elastic gate type; Parallel gate valve can be divided into single gate plate and double gate plate. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and Non rising stem gate valve.
Low temperature gate valve When closing, the sealing surface can only rely on the medium pressure to seal, that is to rely on the medium pressure to press 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 are forced to seal, that is to rely on external force to force the gate to the valve seat to ensure the sealing of the sealing surface.
The gate valve of low temperature gate valve moves along with the valve stem in a straight line, which is called rising stem gate valve (also known as rising stem gate valve). Generally, there are trapezoidal threads 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 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 fluid passage is completely unblocked, 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 where it can not be opened is taken as its full open position. In order to consider the locking phenomenon of temperature change, the valve is usually turned back 1 / 2-1 turn after opening to the top position. Therefore, the full open position of the valve is determined according to the position of the gate (i.e. stroke >).
In some gate valves, the stem nut is set on the gate, and the hand wheel turns to drive the valve stem to rotate, and the gate is lifted. This kind of valve is called rotary rod gate valve or Non rising stem gate valve.
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