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The basic principle of electric stop valve

2018-08-28

The cut-off valves produced by Henan Shangvalve Co., Ltd. can be divided into electric cut-off valves, manual cut-off valves, pneumatic cut-off valves, hydraulic cut-off valves, etc. The following is a brief introduction to the basic knowledge of electric cut-off valves.

Structure of electric stop valve

The opening and closing parts of the electric stop valve are plug-type valve discs. The sealing surface is flat or conical. The movement forms of the valve stem include lifting type and lifting rotating rod type. The stop valve is suitable for full opening or full closing and cannot be used as regulating throttling. Globe valve is a forced seal valve, cut-off valve medium flow from the top of the valve into the valve cavity, then under the action of medium pressure, close the valve force is small, and open the valve force, the diameter of the stem can be reduced accordingly. Under the action of the medium, this form of valve is also more tight. Globe valve is the most widely used a valve, very popular, due to the opening and closing of the sealing surface between the friction is small, more durable, open height is not, easy to manufacture, easy maintenance, both suitable for low pressure, but also suitable for high pressure. The closing principle of the globe valve is to rely on the pressure of the valve lever to make the valve clack sealing surface and the valve seat sealing surface closely fit to prevent the medium from circulating. The cut-off valve only allows the medium to flow in one direction and is directional when installed.

Advantages of electric stop valve: A, simple structure. B, small working stroke, short opening and closing time. C, good sealing performance, small friction between sealing surfaces and long service life. D, straight-through type is the most common structure, DC and right-angle type, straight-through type, but its fluid resistance is the largest, DC fluid resistance is small, and it is mostly used for fluids containing solid particles. Right-angle type is suitable for smaller diameter, globe valves for higher pressures.

Disadvantages of electric stop valve: a, fluid resistance, opening and closing when the force required is larger. B, not suitable for with particles, viscosity, easy to coking medium, c, poor regulation performance. D, the type of stop valve according to the position of the stem thread of the external thread type, internal thread type. According to the flow direction of the medium, it is divided into straight, straight and angle type. Cut-off valve according to the sealing form of packing seal globe valve and bellows seal globe valve.

For more knowledge of stop valve, please consult Henan Shangvalve Co., Ltd. at the total telephone number of 13703820603/15551530000.