Function of hydraulic check valve,relief valves

- Sep 17, 2018 -

Hydraulic locks, hydraulically controlled check valves, what are the two functions in the hydraulic system? What is the difference between the pressure relief valve and the relief valve? What is the speed control valve used for? Adjust the flow? Is the flow rate of the pump adjusted?

 

Modular hydraulic check valve

Modular hydraulic check valve


Hydraulic relief valve

Hydraulic relief valve

The function of the relief valve: overflowing the excess hydraulic oil in the hydraulic system and maintaining a certain pressure on the oil in the hydraulic system. It can also be used to prevent the system from being overloaded and to provide safety protection.

The role of the pressure reducing valve: used to reduce the pressure of a part of the hydraulic system, so that this part gets a lower steady pressure.

The hydraulic lock is often used in combination with two hydraulic control check valves, which are respectively in the oil inlet and outlet, and the control direction is opposite. Generally, the position of the hydraulic cylinder is strictly locked in the system. The hydraulic control check valve can only control the oil passage in one direction; the relief valve controls the inlet pressure, the pressure reducing valve controls the outlet pressure, and the difference between the working principle of the hydraulic control check valve and the one-way valve

Check valves are divided into two categories: ordinary check valves and pilot operated check valves. Ordinary check valves only allow liquid flow in one direction. Hydraulically controlled check valves have the function of a common check valve and are only controlled remotely. The mouth is controlled by a certain pressure, and the flow can be reversed. In the engineering application, two hydraulic control one-way valves are commonly used to form a hydraulic lock.

The opening of the hydraulic pressure control valve is mainly used in the reverse direction.

Mainly the forward direction can pass, when the reverse pass, the check valve needs to be opened by the reverse control oil circuit control, so that it can pass in the reverse direction.

A check valve is generally a valve that allows a single flow of liquid to pass through, but not in the reverse direction. The main pump outlet is used to prevent backflow of hydraulic oil and damage the pump. Sometimes it is combined with other single valves to form valves with special functions, such as discharge relief valve; our pump In fact, it is also the simplest example, but his medium is gas instead of hydraulic oil. In order to make the hydraulic fluid flow backward under the permission of a certain license, combined with the characteristics of the hydraulic pressure, the pressure oil of another oil circuit is used. Control is performed, and when the reverse control pressure is greater than its set value, the spool is opened, and the main oil passage realizes reverse oil flow. Mainly used in front of hydraulic actuators for pressure protection.