An Active Proportional Pressure Relief Valve
A technology of pressure relief valve and proportional relief valve, which is applied in fluid pressure actuators, servo motors, servo motor components, etc., can solve the problems of high processing cost, poor performance consistency, and many parts, and achieve reliable working performance , good performance consistency, and easy processing
Active Publication Date: 2016-06-29
ZHEJIANG UNIV
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Problems solved by technology
In the process of use, the above-mentioned invention patent has the following disadvantages: First, the above-mentioned proportional pressure relief valve has a complex structure, many parts, high processing costs, and poor performance consistency; secondly, the gap between the pressure relief ports of the above-mentioned proportional pressure relief valve is small (0.01mm) is prone to failures such as spool stuck
Finally, the above-mentioned proportional pressure relief valve only achieves pressure relief by letting go of the hydraulic oil at the first oil port. It is impossible to realize the pressure recovery adjustment at the first pressure relief port, and it is impossible to realize the proportional pressure relief of multiple proportional pressure relief valves
Method used
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Embodiment Construction
[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] Such as figure 1 As shown, the active proportional pressure relief valve 8 of the present invention includes a valve body 9, a proportional relief valve 7 and a reversing valve 11, and a first oil passage 5, a second oil passage 6, and a third oil passage are opened in the valve body 9. Road 10 and fourth oil passage 12. Wherein, one end of the first oil passage 5 communicates with the oil outlet of the proportional relief valve 7, the other end of the first oil passage 5 is the output oil port 3 of the active proportional relief valve 8, and the output oil port 3 is connected to the external oil tank. connected. One end of the second oil passage 6 communicates with the oil inlet of the proportional relief valve 7, and the other end of the second oil passage 6 is installed with a flow control valve 4, and the inlet of the flo...
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The invention discloses an active proportional pressure relief valve, which comprises a valve body, a proportional overflow valve and a reversing valve, and a first oil passage, a second oil passage, a third oil passage and a fourth oil passage are opened in the valve body; One end of the first oil passage communicates with the oil outlet of the proportional relief valve, and the other end of the first oil passage communicates with the external oil tank; one end of the second oil passage communicates with the oil inlet of the proportional relief valve, and the second oil passage communicates with the oil inlet of the proportional relief valve. The other end of the flow control valve is installed with a flow control valve, and the inlet of the flow control valve is connected with an external control oil source; one end of the third oil passage is connected with the second oil passage, and the other end of the third oil passage is connected with one of the reversing valves. The oil port is connected; one end of the fourth oil passage is connected with the other oil port of the reversing valve, and the other end of the fourth oil passage is the pressure relief oil port of the active proportional pressure relief valve. The invention has the advantages of simple structure, convenient processing, good performance consistency, reliable working performance and the like.
Description
technical field [0001] The invention relates to a hydraulic valve, in particular to a pressure relief valve used in a hydraulic system to realize the pressure relief function. Background technique [0002] At the end of the pressure holding process of the hydraulic system, it is usually necessary to use a pressure relief circuit to slowly release the huge energy accumulated due to the elastic deformation of the frame, hydraulic cylinders and pipelines and the compressibility of the oil, so as to prevent the hydraulic pressure caused by the sudden release of energy. Shock, vibration, and even rupture of pipelines and valves, the pressure relief circuit is an important safety circuit for large equipment such as hydraulic presses, and the pressure relief valve is the main hydraulic component of the pressure relief circuit. The high-pressure proportional pressure relief valve described in Chinese invention patent CN201110288908.3 consists of a proportional pressure reducing valv...
Claims
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IPC IPC(8): F15B13/02F15B11/16
Inventor 魏建华王刚田启岩张强
Owner ZHEJIANG UNIV