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The Working Principle And Movement Mode Of The Gate Valve

Jun 20, 2017

    When the valve is closed, the sealing surface can only rely on the media pressure to seal, that is, relying on the media pressure to press 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 forced to seal, that is, when the valve is closed, to rely on external force forced to the gate pressure to the valve seat to ensure that the sealing surface of the seal. Movement: gate valve with the stem with a straight line for the movement, also known as the pole gate valve.Gate Valve  Usually in the lifting rod on the trapezoidal thread, through the top of the valve nut and the valve body on the guide groove, the rotary motion into a linear motion, that is, the operating torque into the operating thrust. When the valve is opened, when the height of the gate is equal to 1: 1 times the diameter of the valve, the fluid channel is completely open, but this position can not be monitored during operation. The actual use of the stem is the vertex as a sign, that is, the location of the open, as its full open position. In order to consider the temperature changes appear locking phenomenon, usually in the open to the vertex position, and then back 1 / 2-1 lap, as the full valve position. Therefore, the valve fully open position, according to the position of the gate (ie stroke to determine.) Some gate valve stem nuts on the gate, hand wheel rotation to drive the stem rotation, leaving the gate to lift, this valve called Rotary lever valve or called dark bar gate valve.Gate Valve

    Domestic production gate valve manufacturers are more connected to the size of most are not unified. Mainly divided into the following categories: JB / T2203-1999 "gate valve structure length" based on the general category. At present, most of the domestic safety valve manufacturers are designed and manufactured according to this standard. Manual gate valve works: turn the hand wheel, through the hand wheel and the stem of the thread into, back, lift or drop the stem connected to the valve plate, to open and close the role. According to the shell / body material classification, the gate valve can be divided into: metal materials valves: such as carbon steel valves, alloy steel valves, stainless steel valves, cast iron valves, titanium valves, Monel valves, copper alloy valves, lead alloy valves. Metal valve lining valve: such as rubber lined valve, lining fluorine valve, lining the lead valve, lining plastic valve, lining enamel valve. Non-metallic materials valves: such as ceramic valves, glass valves, plastic valves.Gate Valve