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2020.06.18

Conventional valve product design standards

GB/T4213-2008 Pneumatic regulating valve GB/T8464-2008 Iron and copper threaded connection valves GB/T10869-2008 Power station regulating valve GB/T12232-2005 Universal valve flange connection iron gate valve GB/T12233-2006 General valves Iron stop valves and lift check valves GB/T12234-2007 Steel gate valve with stud connected bonnet for petroleum and natural gas industry

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Conventional valve product design standards

2020.06.10

Basic standards for valves

Valve standards are divided into mandatory national standards (GB) and recommended national standards (GB/T). The number of the latest standard for valves consists of the code name of the first standard, the sequence number of the first standard released and the year number (year of release) of the first standard. The national standard for valves includes two parts: one is to regulate the manufacturing, structural length, material, etc.; the other is to conduct a standardized search for the structure, size, etc. of each type of valve. Users can look at the corresponding Valve standards. This standard mainly provides a brief explanation of the general standards and technical condition standards for valves.

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2020.06.03

Solutions to poor stability of electric control valves

Electric regulating valves, also known as control valves, are the final control components in the field of industrial automation process control that use power operation to change process parameters such as medium flow, pressure, temperature, and liquid level by receiving control signals output from the regulating control unit. Generally composed of an actuator and a valve. Because of its heavy weight, it is difficult to pinpoint the problem and is often thankless. It also involves system operation, system completion, adjustment quality, environmental pollution, etc.

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Solutions to poor stability of electric control valves

2020.05.28

Basis for selecting valves

1. The purpose, operating conditions and operation control method of the selected valve. 2. The nature of the working medium: working pressure, working temperature, corrosion performance, whether it contains solid particles, whether the medium is toxic, whether it is a flammable or explosive medium, the viscosity of the medium, etc. 3. Requirements for valve fluid characteristics: flow resistance, discharge capacity, flow characteristics, sealing grade, etc. 4. Installation dimensions and overall dimension requirements: nominal diameter, connection method and connection size to the pipeline, overall dimensions or weight limit, etc. 5. Additional requirements for the reliability, service life of valve products and the explosion-proof performance of electric devices.

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2020.05.21

Features to note when selecting valves

Usage characteristics: It determines the main performance and scope of use of the valve. The usage characteristics of the valve include: valve category (closed-circuit valve, regulating valve, safety valve, etc.); product type (gate valve, globe valve, butterfly valve, ball valve, etc.) ; Materials of the main parts of the valve (valve body, valve cover, valve stem, valve disc, sealing surface); valve transmission mode, etc.

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2020.05.13

Gate valve pressure test method

The strength test of gate valves is the same as that of stop valves. There are two methods for gate valve sealing test. ① Open the gate to raise the pressure in the valve to the specified value; then close the gate, take out the gate valve immediately, check whether there is leakage at the seals on both sides of the gate or directly inject the test medium into the plug on the valve cover to the specified value , check the seals on both sides of the gate. The above method is called intermediate pressure test. This method is not suitable for sealing tests on gate valves with nominal diameters below DN32mm. ② Another method is to open the gate to increase the valve test pressure to the specified value; then close the gate, open the blind plate at one end, and check whether the sealing surface is leaking. Turn the head back again and repeat the above test until it passes the test. The sealing test of the pneumatic gate valve packing and gasket should be carried out before the gate sealing test.

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2020.05.08

Comprehensive pressure testing methods for various valves!

Under normal circumstances, industrial valves do not undergo strength tests when in use, but the valve body and valve cover after repair or those damaged by corrosion should undergo strength tests. For safety valves, their set pressure, backseat pressure and other tests should comply with the instructions and relevant regulations. The strength and tightness test should be carried out before the valve is installed. 20% of low-pressure valves shall be randomly inspected. If they are unqualified, 99.99% shall be inspected; medium and high-pressure valves shall be inspected 99.99%. Commonly used media for valve pressure testing include water, oil, air, steam, nitrogen, etc. The pressure testing methods for various industrial valves including pneumatic valves are as follows:

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Comprehensive pressure testing methods for various valves!

2020.04.29

Valve structural terms

The distance between the inlet and outlet end faces of the valve; or the distance from the inlet end face to the outlet axis. 阀门进、出口端面之间的距离；或进口端面至出口轴线的距离。

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2020.04.22

The uses and characteristics of pneumatic control valves! Worth a look!

Pneumatic control valve is one of the industrial process control instruments widely used by industrial enterprises such as petroleum, chemical industry, electric power, and metallurgy. According to the working principle of the pneumatic control valve, compressed air is used as the power source, the cylinder is used as the actuator, and the valve is driven with the help of electrical valve positioners, converters, solenoid valves, positioning valves and other accessories to achieve switching or Proportional adjustment receives control signals from the industrial automation control system to adjust various process parameters of the pipeline medium: flow, pressure, temperature, etc. The characteristics of pneumatic control valves are simple control, fast response, and intrinsic safety, without the need for additional explosion-proof measures.

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The uses and characteristics of pneumatic control valves! Worth a look!

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