Hydraulic valves play a vital role in hydraulic systems, they are automation elements that operate with pressure oil, often in combination with solenoid pressure matching valves, to control fluid pressure, flow, and direction. The following is a detailed introduction to the hydraulic valve:
1. Definition and classification of hydraulic valves
Hydraulic valves are components used in hydraulic transmissions to control the pressure, flow, and direction of liquids. According to different control methods and functions, hydraulic valves can be divided into many types:
Classified by control method: manual, electronically controlled, hydraulic-controlled, etc.
Classification by function:
Pressure control valves: such as relief valves, pressure reducing valves, sequential valves, etc., which are used to control the pressure of the system.
Flow control valves: such as throttle valves, speed control valves, diverter collector valves, etc., which are used to regulate the flow of fluids in the system.
Directional control valves: such as solenoid directional valves, manual directional valves, check valves, etc., which are used to control the on-off and flow direction of fluids in the control system.
Classified according to installation method: plate valves, pipe valves, stacking valves, threaded cartridge valves, cover valves, etc.
Classified according to the mode of operation: manual valves, motorized valves, electric valves, hydraulic valves, electro-hydraulic valves, etc.
Second, the main types and functions of hydraulic valves
Pressure Control Valves:
Relief valve: It can control the hydraulic system to maintain a constant state when the pressure is set, and play a role in safety protection.
Pressure Reducing Valve: It can make the branch circuit get a stable pressure lower than the oil pressure of the main circuit.
Sequential valve: It can make one actuator act, and then make other actuators act in order.
Flow Control Valves:
Throttle valve: After adjusting the area of the throttle, the movement speed of the actuator can be basically stable.
Speed control valve: It can keep the flow rate through the throttle valve unchanged, so that the movement speed of the actuator is stable.
Diverter and Manifold valves: respectively used to make two actuators of the same oil source equal or proportional flow rate.
Directional Control Valve:
Check valve: only allows the fluid to be connected in one direction in the pipeline, and the reverse is cut off.
Reversing valve: change the on-off and off-off relationship between different pipelines to realize the on-off of the liquid path or the change of the direction of the liquid flow.
Third, the application range of hydraulic valves
Hydraulic valves are widely used in various machinery and equipment, such as construction machinery, mining machinery, hydraulic lifts, packaging machines, coking plants, coal mines, injection molding machines, bending and stamping equipment, foundries, balers, steel mills, CNC machine tools, agricultural machinery, etc.
Fourth, the selection principle of hydraulic valves
When choosing a hydraulic valve, the following principles should be considered:
1. Determine the type of hydraulic valve according to the functional requirements of the system.
2. According to the actual installation situation, choose different connection methods, such as tubular or plate connection.
3. Select the rated pressure of the hydraulic valve according to the maximum working pressure of the system design, and select the flow specification of the hydraulic valve according to the maximum flow through the hydraulic valve.
4. Consider the control mode of hydraulic valve, such as manual, electric, hydraulic, etc., to meet the automation degree and control performance requirements of the system.
5. Precautions for hydraulic valves
When using and maintaining hydraulic valves, the following points should be noted:
1. Correctly select the hydraulic valve to ensure that it meets the specific working conditions and requirements.
2. When installing the hydraulic valve, attention should be paid to the position of the valve, the smoothness and cleanliness of the pipeline to avoid leakage and impurities.
3. The start and stop of the hydraulic valve should be smooth and slow to avoid the impact of fast start and stop on the valve and hydraulic system.
4. Regularly maintain and maintain the hydraulic valve to ensure its normal operation and prolong its service life.
5. Follow the operating procedures and safety standards to ensure personal safety during use and maintenance.
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