Introduction of working principle of unloading valve
Classification:
Release Time：2021-05-21
The working device control system is supplied by two oil pumps. The main pump is the P7600-F100 pump, which is used to control the movement of the boom and the bucket cylinder. The pilot pump is P124-G16, which is used to control the proportional pilot valve and then control the main reversing valve. The displacement of the core achieves the working speed of the boom and bucket cylinder. The oil of the pilot pump first enters the brake valve. In addition to ensuring the brake oil, it provides a control oil source to the pilot system. This oil enters the control oil circuit after being reduced to the control pressure required by the pilot control system through the pressure reducing valve., Control the action of the working device.
Introduction of working principle of unloading valve
1. System composition:
In different working conditions, the basic composition of the control system is different.
2. Hydraulic system working principle:
The working device control system is supplied by two oil pumps. The main pump is the P7600-F100 pump, which is used to control the movement of the boom and the bucket cylinder. The pilot pump is P124-G16, which is used to control the proportional pilot valve and then control the main reversing valve. The displacement of the core achieves the working speed of the boom and bucket cylinder. The oil of the pilot pump first enters the brake valve. In addition to ensuring the brake oil, it provides a control oil source to the pilot system. This oil enters the control oil circuit after being reduced to the control pressure required by the pilot control system through the pressure reducing valve., Control the action of the working device.
Pull the operating handle to move backward, the pilot oil enters the proportional pilot pressure reducing valve, and the pilot oil from the proportional pilot pressure reducing valve controls the movement of the main reversing valve spool, so that the oil from the working pump enters the boom cylinder to realize the boom rise. The greater the output pressure of the proportional pilot pressure reducing valve, the greater the displacement of the main reversing valve spool, the greater the flow through the main reversing valve, and the faster the boom rises. When the operating handle is pulled to the limit position, the limit electromagnet in the handle is energized, and the handle is attracted in the limit position. The boom rises at the maximum speed. When it rises to the position defined by the upper limit switch of the boom, the limit electromagnet of the operating handle is powered off, the handle automatically returns to the neutral position, and the boom can be kept in the defined position. In the process of boom rising, if the boom needs to stay in a certain position, the operating handle needs to be returned to the neutral position.
During lifting and other operations, the valve core of the pilot control unloading valve is closed, and the oil from the steering pump opens the one-way valve to join the working system, thus increasing the hydraulic oil of the working device, meeting the requirements of low pressure and large flow required for the operation, improving the operation speed of boom lifting and shortening the operation cycle. It is an advanced hydraulic system with extremely significant high efficiency performance.
Related News
2026/02/28
Contact Information
+86 27-8970 8339
Address: No.5, Zhengjie, Shuangliu Street, Xinzhou District, Wuhan City, Hubei Province