BS190
Classification：
Key words：
Features
When the gate valve opens, the passage of fluid is completely free when the height of the gate lift is equal to 1:1 times the diameter of the valve, but this position cannot be monitored during operation. In actual use, it is the apex of the valve stem as a sign, that is, the position of open motionless, as its fully open position. In order to take into account the temperature changes in the phenomenon of locking, usually open to the apex of the position, and then back 1/2-1 turn, as the fully open position of the valve. Therefore, the valve's fully open position, according to the position of the gate (i.e., travel) to determine.
Product Details
Gate valve closed, the sealing surface can only rely on media pressure to seal, that is, relying on the media pressure will be the sealing surface of the gate to the other side of the valve seat to ensure that the sealing surface of the seal, which is self-sealing. Most of the gate valve is a mandatory seal, that is, when the valve is closed, to rely on external forces to force the gate to the valve seat to ensure that the sealing surface of the seal.
Gate valve gate with the stem together for linear movement, called the lifting stem gate valve (also called open stem gate valve). Usually on the lifting stem has trapezoidal threads, through the nut at the top of the valve and the valve body on the guide groove, the rotary motion into a straight line, that is, the operating torque into the operating thrust.
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