Circulating pressure supplement type cartridge valve

Abstract

Provided is a circulating pressure supplement type cartridge valve. The circulating pressure supplement type cartridge valve comprises a bonnet connected with one end of a valve body, wherein a slidable ejector rod and a valve plug are arranged in the valve body, the ejector rod is connected with the valve plug, the bonnet is connected with a cover plate, an oil cylinder is defined by the bonnet and the cover plate together, a piston is arranged in the oil cylinder, one end of the ejector rod extends into the oil cylinder to be connected with the piston, the middle portion of the ejector rod penetrates through the valve plug, a first through hole is formed in the other end of the valve body, the other end of the ejector rod is connected with a sealing mechanism which is used for sealing the first through hole, and is provided with a first conical face used for sealing, a second conical face is correspondingly arranged on the first through hole, and is used for sealing, the first conical face is connected to the second conical face in a pressed mode, one end of the ejector rod is connected with the piston in a threaded mode, the oil cylinder is divided into a first piston chamber and a second piston chamber by the piston, and a third hole channel which is communicated with the first piston chamber is formed in the cover plate. The circulating pressure supplement type cartridge valve has the advantages of being simple and reasonable in structure, flexible in operation, small in size, low in manufacturing cost, capable of carrying out a small amount of pressure supplement, and wide in range of application.

Description

technical field [0001] The invention relates to a cartridge valve, in particular to a circulating pressure supplementary cartridge valve. Background technique [0002] When the accumulator of the die-casting machine is storing energy, the oil pressure of the accumulator will be slightly lower than the system pressure due to the pressure loss of the valve. However, some demanding molds require precise pressure. When the traditional die-casting machine is storing energy, if the attached figure 1 As shown, the system pressure is often increased for energy storage. Although this method is relatively simple, it is generally not recommended. The reason is that when it comes to the control program and debugging, the pressure of other branch oil circuits may be affected by the adjustment of the system pressure. [0003] Chinese Patent Document No. CN201061823Y disclosed on May 21, 2008 an injection oil circuit device for a hot chamber die-casting machine, which includes an inject...

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Problems solved by technology

This injection oil circuit device has a complex structu

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