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Seven points of attention for the selection of hydraulic control valves
The specifications and models of the various hydraulic control valves can be based on the maximum pressure of the system and the actual flow through the valve (from the working condition map and the system diagram) and considering the control characteristics of the valve, the stability and the size of the oil port, the size of the shape, the way of installation and connection, the mode of manipulation, etc., from the sample or the catalogue of the product.
time：2018-05-25 15:46:51
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Installation and maintenance of hydraulic control valve
The hydraulic control valve mainly uses its own pressure in the pipeline to control the movement of the main valve disc through the pressure difference of the upper and lower chamber control chamber, and then produces various series of valves through the bypass pipe and various different structure guide valves, thus achieving the purpose of various requirements.
time：2018-05-25 15:46:51
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Structure and working principle of liquid controlled one-way valve
When the control oil outlet does not pass the pressure oil, the oil can only go from PA to PB. When the oil pressure is passed through the oil outlet, the positive and reverse oil can be freely passed. One-way valve cover: right angle check valve, one-way valve function, controllable one-way valve, low pressure one-way valve.
time：2018-05-25 15:46:50
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Type, performance and working principle of hydraulic control valve
The hydraulic control valve is a hydraulic pressure control valve. It consists of a main valve and its attached conduit, pilot valve, needle valve, ball valve and pressure gauge.
time：2018-05-25 15:46:50
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Select the attention point of the hydraulic control valve
The specifications of various hydraulic control valves, the maximum pressure of the system and the actual flow through the valve, and the control characteristics of the valve, the stability and the size of the port, the size of the shape, the mode of installation, the mode of manipulation, etc., are selected from the sample or catalogue of the product.
time：2018-05-25 15:46:50
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Common valve faults and preventive measures
This is the main aspect of leakage, often seen in factories.
The reasons for the leakage of the packing letter are the following points:
(1) the packing is not suitable for the corrosion, temperature and pressure of the working medium; (2) the filling method is not correct, especially the whole packing is placed in the coil, which is the most easy to produce leakage; 3. The machining precision of the stem or the surface finish is not enough, or has the ellipticity, or there is a mark; (4) the valve rod has been pitting or rusty because of the lack of protection in the open air; 5 The valve stem is bent; 6. The packing has been used too long, and it has been aging.
time：2018-05-25 15:46:50
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Standard technical requirements for multifunctional pump control valves
This standard is applicable to multifunctional pump control valves with nominal pressure of PN1.0MPa - PN4.0MPa and nominal diameter of DN50mm - DN1200mm.
The standard technical requirements are introduced as follows:
1. pressure - temperature degree
The pressure temperature level of the multi-function pump control valve is determined by the pressure of the shell, the internals and the material of the control pipe system. The maximum allowable working pressure of a multi-function pump control valve at a temperature to take the small value of the maximum allowable working pressure value at the temperature of the shell, inner part and control pipe system material at the temperature
time：2018-05-25 15:46:50
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Definition and classification of valves
Valve is the control part of the fluid conveying system. It has functions such as cut-off, regulation, diversion, prevention of countercurrent, steady pressure, diversion or overflow pressure relief. Valves used for fluid control systems, ranging from the simplest cut-off valves to the most complex automatic control systems, have a wide range of valves and specifications. Valves can be used to control the flow of various types of fluids such as air, water, steam, corrosive media, mud, oil, liquid metal and radioactive medium.
time：2018-05-25 15:46:50
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Standards for manufacture, installation and acceptance of valves manufactured by our factory
Standards for manufacture, installation and acceptance of valves manufactured by our factory
time：2018-05-25 15:46:50
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How to install the flanged valve
1, valve and piping flange surface should be free of damage, scratches, etc., and keep clean. In particular, when the metal washer is used, the grooves of the flanges should be in agreement with the gaskets, and they should be coated with red lead to ensure the sealing condition is good.
2. The error between the flange surface of the piping and the center line of the piping and the bolt hole of the flange should be within the allowable value. Valve and piping center line should be consistent before installation.
time：2018-05-25 15:46:50
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