Types and principles of hydraulic valves

Hydraulic valve is a device that regulates liquid flow and pressure, which can play a very important role in the hydraulic system. According to the different control functions of hydraulic valves, they can generally be divided into several types such as direction control valves, pressure control valves, flow control valves, proportional control valves and safety valves. The following will specifically introduce the principle and application of various types of hydraulic valves.
1. Direction control valve
A directional control valve is a valve that controls the flow of liquid in a hydraulic system. It is usually used to change the direction of liquid flow in the hydraulic system to control the movement of hydraulic components. Direction control valve is mainly composed of valve block, valve core, spring, sealing ring, etc., it can also be added according to the specific control requirements, some special structures, such as electromagnets, etc., to achieve automatic control.
Direction control valves are widely used in hydraulic machinery, engineering machinery, aerospace, rail transit, machine tools, metallurgy and other fields to control the movement direction of liquid action or various executive components. According to different control requirements, direction control valves are also divided into one-way valves, reversing valves, split valves, cartridge valves and so on.
Two, pressure control valve
Pressure control valve is a valve that can control the pressure in the hydraulic system. It plays the role of pressure control and safety protection in hydraulic system. Pressure control valves can usually be divided into pressure reducing valves, safety valves, direct acting pressure regulating valves and other types according to the mode of action.
The pressure reducing valve is mainly used to stabilize the high-pressure liquid and reduce it to a working pressure lower than that required by the system to ensure the normal operation of the system. Pressure reducing valves usually have two forms: intermittent pressure regulator and continuous pressure regulator.
Safety valve is a valve that can be opened in the case of abnormal high pressure in the system to protect the hydraulic system and the safety of the operator. Safety valves are usually divided into several types according to the mode of operation, such as manual, automatic and proportional.
The direct acting pressure regulator is usually used to control the stable pressure of the hydraulic system, adjust the dynamic pressure of the system, limit and analyze the pressure fluctuation and other operations.
Three, flow control valve
Flow control valve is a valve that can change the liquid flow, which can realize the adjustment of the liquid flow in the hydraulic system. According to its different application scenarios, it can usually be divided into several types such as throttle valve, reversing throttle valve, quantitative throttle valve and so on.
The throttle valve is usually used to throttle the liquid in the hydraulic system to achieve the purpose of flow control. The reversing throttle valve is usually used to change the flow direction of the liquid, and at the same time to control the flow. A quantitative throttle valve is a valve that allows the flow of a liquid to be maintained.
Four, proportional control valve
Proportional control valve is a valve that can adjust the flow and pressure of liquid according to electrical or mechanical signals. It is often used where precise control of speed, force, or position is required. The proportional control valve usually consists of a spool, an electromagnet, a adjusting hole, and an inclination control valve.
The main applications of proportional control valves usually include CNC machine tools, aerospace, automotive industry, plastic forming machinery and other fields, which greatly improves the accuracy and efficiency of the production process.
5. Safety valve
Safety valve is a valve to protect the safe operation of the hydraulic system unit, it is usually used in the pressure system to avoid accidental damage. Safety valves are one-way valves that usually limit the peak pressure in the system. When the system safety pressure is exceeded, the valve is opened to avoid unnecessary damage.
In short, the types and principles of hydraulic valves are different, but their unified purpose is to control the flow and pressure of the liquid in the hydraulic system, so as to achieve the operation and protection of the system. Various types of hydraulic valves have different roles in different application fields, and there are their own advantages and disadvantages. For different application scenarios, we need to choose the most suitable hydraulic valve, and according to the use of maintenance and maintenance, to ensure the normal work of the machine equipment.