Back pressure valve

Abstract

The present invention discloses a back pressure valve, comprising a back pressure valve cylinder, wherein the upper and lower ends of the back pressure valve cylinder are respectively provided with an upper plug and a lower plug, and a back pressure valve piston body is arranged in the back pressure valve cylinder. The side surface of the upper plug is provided with a fluid inlet which communicates with the inner cavity of the cylinder, the central part of the upper plug is provided with a valve core with an overflow hole, and the lower plug is provided with a variable pressure adjusting hole which exerts pressure to the lower end of the back pressure valve piston body by adding fluid. The back pressure valve piston body is in the form of an inner hollow cavity, and the bottom of the hollow cavity communicates with an inner cavity of the back pressure valve cylinder, and the back pressure valve piston body and the contact surface between the back pressure valve piston body and the back pressure valve cylinder are each provided with upper and lower sealing gaskets. A through hole communicating with the inner hollow cavity of the piston body is arranged between the upper sealing gasket and the lower sealing gasket on the back pressure valve piston body. The back pressure valve has a reasonable structure, good operation stability and excellent working performance.

Description

technical field [0001] The invention relates to a back pressure valve for maintaining pipeline fluid pressure in industries such as petroleum. Background technique [0002] The existing pipeline fluid pressure in petroleum and other industries is not easy to maintain the pressure during the entire pipeline process and needs to be improved. Chinese patent CN203594845 U discloses a back pressure valve, which overcomes some of the defects of the prior art, but the movement stability of the piston is not good and needs to be further improved. SUMMARY OF THE INVENTION [0003] The purpose of the invention is to provide a back pressure valve with reasonable structure and good running stability. [0004] The technical solution of the present invention is: [0005] A back pressure valve comprises a back pressure valve cylinder, upper and lower plugs are respectively provided at the upper and lower ends of the back pressure valve cylinder, a back pressure valve piston body is arr...

AI Technical Summary

Problems solved by technology

[0002] The existing pipeline fluid pressure in petroleum and other industries is not easy to maintain pressure in the whole pipeline process, so it needs to be improved

Chinese patent CN203594845 U discloses a back pressure valve, which overcomes some defects of the prior art, but the motion stability of the piston is not good, and needs to be further improved

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