C4 steel gate valves (gate valve) of the opening and closing is ram, ram movement direction and perpendicular to the direction of flow of C4 steel gate valves can only be fully open and close, not to adjust and throttling. C4 steel gate valve gate direction perpendicular to the direction of flow and the C4 steel gate valves can only be fully open and close, not to adjust and throttling. Sealing face has two gate, two of the most commonly used mode gate valve sealing surface form a wedge, the wedge Angle vary with the valve parameters. Classification C4 steel gate drive mode: manual gate valves, pneumatic gate, electric gate valves.

Structure classification of C4 steel gate structure classification, there are many different ways adopted by the sealing element is the main difference between different structure forms, according to the structure of the sealing element, often the gate valve is divided into several different types, and is the most common form of parallel type gate valve gate and deed; According to the structure of the valve stem can be divided into rising stem gate valves and non-rising stem gate valves

C4 steel gate valve installation points

1, installation location, altitude, direction must comply with the design requirements of imports and exports, connection should be firmly connected.

2, all kinds of manual valves installed on the thermal insulation pipe, handle shall not down.

3, a visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards "universal signal valve" GB 12220. For the working pressure is greater than 1.0 MPa and valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5 min, shell and packing shall be no leakage of valve shall be qualified. Leak test, the test pressure is 1.1 times the nominal pressure; The duration of the test pressure in the test should comply with the standard of GB 50243 requirements, qualified for damper seal face no leakage.

The working principle of C4 steel gate:

According to the sealing surface configuration can be divided into wedge type gate valve and parallel sluice gate valve gate, wedge gate valve gate can be divided into: single gate type, double disc and flexible disc; Parallel slide gate valve can be divided into single ram and double ram. According to the threads of the valve stem position, can be divided into rising stem gate valves and dark bar gate valve two kinds.

C4 steel gate is closed:

Sealing surface can only rely on medium pressure to seal, that is, to rely on medium pressure to press the sealing face of gate to the other side of the seat to ensure sealing 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.

The gate valve gate, as a straight line with the stem, called lifting lever 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 the 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 travel > to determine.

Some C4 steel gate valve, the valve stem nut located in ram, the hand wheel rotation drive the valve rod rotation, and make the disc, the valve is called rotating lever gate or non-rising stem gate valves.

A, the manual valve working principle:

Turn the handwheel by hand wheel and screw thread of the valve stem of the advance and retreat, lifting or lowering the valve plate connected to the valve stem, reach the role of opening and closing

C4 steel gate has the following advantages:

Fluid resistance is small. Open and close more effort. Medium flow direction is not restricted, disturbed flow, reduce the pressure.

Shorter form, simple structure, good manufacturing technology, wide application scope.