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A pilot-operated precision overflow valve

An overflow valve and pilot-operated technology, applied in the direction of fluid pressure actuators, servo motor components, mechanical equipment, etc., can solve the problems of restricting wide application, increased overflow pressure, poor flow characteristics, etc., and achieve good flow characteristics , high voltage regulation accuracy, and good voltage regulation characteristics

Inactive Publication Date: 2009-10-07
蔡茂林
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

When the flow through the relief valve increases, the opening of the valve port increases, and the compression of the spring also increases. According to Hooke's law, the force generated by the compression spring also increases accordingly, resulting in an increase in the overflow pressure. , that is, the traditional direct-acting relief valve has low pressure stabilization accuracy and poor flow characteristics, which limit its wide application in pneumatic systems

Method used

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  • A pilot-operated precision overflow valve
  • A pilot-operated precision overflow valve

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Embodiment Construction

[0013] The present invention will be further described below.

[0014] 1. Setting of overflow pressure

[0015] Under the condition that the upstream pressure of the relief valve is stable, the upstream pressure is p set , the outlet pressure of precision pressure reducing valve (2) is p 2 (pilot pressure), the action area of ​​the upper diaphragm (3) is A 1 , the action area of ​​the lower diaphragm (4) is A 2 . The force produced by spool (7) gravity and soft spring (6) offsets substantially, and its size can be ignored.

[0016] From the force balance equation of the double-layer diaphragm structure:

[0017] p set A 1 =p 2 A 2

[0018] have to: p set = A 2 A 1 p 2

[0019] p set That is, the set value of the overflow pressure, which is determined by p 2 Sure. Set p by adjusting t...

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Abstract

The present invention pertains to the field of energy conservation of pneumatic system and realizes a pilot-operated precision overflow valve. The content of the invention mainly relates to adopting a pilot-operated differential diaphragm structure under the circumstance of varying pipeline flow and fluctuating pressure in the downstream of the overflow valve to realize precision pressure stabilization before the valve. The present invention adopts a pilot-operated differential diaphragm structure. The pilot pressure is supplied by a precision pressure relief valve. Comparing with conventional direct-acting overflow valve, the present invention overcomes the shortcoming that the overflow pressure of the overflow valve increases with the increase of the opening degree of the valve port caused by flow increase, and has high accuracy of pressure stabilization and optimized flow characteristics. This overflow valve is characterized by stable pressure, simple structure, low cost and convenient use.

Description

[0001] The invention belongs to the field of energy saving of pneumatic systems, and relates to a pilot type precision overflow valve. Background technique [0002] Pneumatic relief valves are widely used in pneumatic systems, especially in the high and low pressure transformation of pneumatic system energy saving projects. When the high and low pressure transformation of the pneumatic system is carried out, in order to make the most effective use of the energy carried by the gas, higher requirements are put forward for the precision of the pressure stabilization of the pneumatic relief valve. [0003] The traditional direct-acting relief valve adopts a spring structure, and the relief pressure is set by compressing the spring, and the valve core is balanced under the two forces of the relief pressure and the force generated by the compression spring. When the flow through the relief valve increases, the opening of the valve port increases, and the compression of the spring al...

Claims

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Application Information

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IPC IPC(8): F15B13/02
Inventor 蔡茂林
Owner 蔡茂林
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