What are the structural forms of three-way solenoid valve? For what occasion? Three way solenoid valve can be divided into ordinary type, waterproof type, explosion-proof type and so on. According to its action mode, it can be divided into direct acting type and pilot type. In the direct acting type, the coil pulls in the iron core to directly drive the stop valve to switch the gas path; in the
What is the principle of caliber calculation? In different automatic control systems, the flow, medium, pressure, temperature and other parameters vary greatly, and the flow coefficient of the control valve is tested under the pressure difference of 100KPA and the medium is normal temperature water. It is not possible to compare the actual flow with the flow coefficient of the valve (because of the different conditions of pressure difference and
Diaphragm valve The structure of diaphragm valve is very different from that of general valve. It is a new type of valve and a special type of block valve. Its opening and closing part is a diaphragm made of soft material, which separates the inner cavity of the valve body from the inner cavity of the valve cover and the driving parts. It is widely used in various fields. The
Gasket is a mechanical seal between two objects, which is usually used to prevent pressure, corrosion, and pipeline natural thermal expansion and contraction leakage. Since the machined surface cannot be perfect, the irregularity can be filled with a gasket. 1. The correct selection of sealing gasket is the key to ensure no leakage of valve. For the same working condition, there are several kinds of pads Notes on Selection Correct
Valve is used to control the medium in the pipeline, with a movable mechanism of mechanical products. Its basic function is to connect or cut off the flow of pipeline medium, change the flow direction of medium, adjust the pressure and flow of medium, and protect the normal operation of pipeline and equipment. Valve type With the development of modern science and technology, valves are widely used in T industry,
1. Valve selection and setting location: (1) Valves used on water supply pipelines are generally selected according to the following principles: 1. When the pipe diameter is not more than 50mm, a stop valve should be used; when the pipe diameter is more than 50mm, a gate valve or butterfly valve should be used 2, when the flow and water pressure need to be adjusted, a regulating valve and a
The high temperature working conditions mainly include sub-high temperature, high temperature class I, high temperature class II, high temperature class III, high temperature class IV, and high temperature class V, which will be introduced separately below. 1. Sub-high temperature Sub-high temperature means that the operating temperature of the valve is in the region of 325 to 425°C. If the medium is water and steam, WCB, WCC, A105, WC6 and WC9
Common materials for valves (1) Cast iron 1. Gray cast iron, such as HT200, HT lung 0, etc., is suitable for the nominal pressure not greater than PN16, and the working temperature is -10~100℃. For oils and general liquid media (water, steam, petroleum products, etc.) between C, the nominal pressure is not greater than PN10. The working temperature is -10~200℃. Mediums such as steam, general gas, coal gas, ammonia gas
