Opening and closing a gate valve, gate valve) is ram, ram movement direction perpendicular to the direction of flow and the valve can only be fully open and close, unwell door parameter varies, usually for 5 °, medium temperature is not high for 2 ° 52 . To improve the manufacturability, make up for the sealing surface Angle in the process of our processing deviation, this damper is called elastic disc.

Exercise:

The ram, as with the stem straight line

Material classification:

Metal materials, valve lining, non-metallic materials

Gate valve is closed, sealing surface can only rely on medium pressure to seal, that only depend on the medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the seal face seal, this is the seal. Most is adopt compulsory seal gate valve, the valve is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface sealing.

Exercise: gate valve gate, as a straight line with the stem

Z41H flange wedge gate valve, also called rising stem gate valves. Usually in lifting lever on the trapezoidal thread, through the valve at the top of the nut and guide groove on the valve body, the rotation movement into linear motion, which is the operating torque thrust into operation. Open valve, when the gate hoisting height is equal to valve size 1:1 times, fluid channels open completely, but at runtime, the position cannot be monitored. Actual use, is the stem apex as a sign, that is fixed position, as its full open position. To consider locking phenomenon in a temperature change, usually in the open to the vertex positions, pour 1/2-1 ring back, as the full open position of the valve. Valve in full open position, therefore, according to the location of the damper (namely the trip >. Some gate valve stem nut is located in the gate, the hand wheel rotate to drive the stem, and make the disc, the valve is called rotating lever gate or non-rising stem gate valves.

Main categories: domestic manufacturer of gate valve, connection size are not unified.

Rigid single disc gate valves, gate valves can be divided into:

Valve metal materials: such as carbon steel, alloy steel, stainless steel valve, cast iron valve valve, the titanium alloy valve and monel valve, copper alloy, lead alloy valve, etc.

Metal valve body lining: such as rubber lining, fluorine-butterfly valves, lead lined valves, valve lining plastic valves, valve lining enamel.

Valve non-metallic materials: such as ceramic, glass, plastic valve valve.