Views: 234 Author: Site Editor Publish Time: 2021-09-15 Origin: Site
Hydraulic sequence valve is used in a hydraulic pump with hydraulic pump adapter and hydraulic pump spline adapter to supply more than two reusable hydraulic fittings, and in accordance with a certain sequence of action of the occasion of a pressure valve (pressure can be referring to their own pressure or external oil pressure). Its structure and operating principle are very similar to the relief valve. It differs from the relief valve in that the outlet of the High Pressure Hydraulic Ball Valve is directly connected to the actuator and there is a special drain port.
The hydraulic oil enters the hydraulic sequence valve from the inlet and ACTS on the lower end of the spool through the channel; the spool moves to the left until the pressure acting on the spool is balanced with the spring force. When the pressure reaches the set pressure through pressure gauge for ball, the hydraulic sequence valve will be opened. The hydraulic oil enters the hydraulic actuator behind through the sequence valve, thus realizing the sequential motion control of the components.
We set a reverse check valve between the inlet and outlet of the hydraulic sequence valve, and that is a one-way sequence valve. The hydraulic oil enters the one-way sequence valve (forward) from the inlet. When the pressure is adjusted by the pressure gauge ball valve, the spool moves upward, and the oil connected with the inlet and outlet can flow from the inlet to the outlet, playing the role of sequence control. When the hydraulic oil enters the one-way sequence valve from the outlet (reverse), the yellow valve core moves down under the action of the hydraulic oil pressure, the outlet is connected with the inlet, and the hydraulic oil passes through the check valve. The sequence valve does not work this time, and the sequence control does not work at this time either.
If the upper body is rotated 180° so that the drain hole of the spring chamber is connected with the oil outlet and connected to the oil tank after the outlet, then the hydraulic sequence valve will become the unloading valve.
Hydraulic sequence valves and one-way valves are often used together to form a one-way sequence valve. In the hydraulic power transmission system, according to the different load, we generally need to enter the working state in a certain order, then need to use the sequence valve for control.
In the hydraulic circuit of the supporting leg of the car crane, the hydraulic oil controls two supporting legs before and after work. In order to maintain the stability of the machine, we extend the back leg (cylinder 2) and then the front leg (cylinder 1) through the control of sequence valve. When the support leg is retracted, the front leg (cylinder 1) is retracted and then the back leg (cylinder 2) is retracted.
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