Water stroking-proof switch valve

Abstract

The invention relates to a water hammer preventing switch valve which is used in fields of oil extraction in an oil field and mechanical fluid transportation. The invention as a switch valve for actively preventing water hammer comprises a valve sleeve, a spherical valve core with an operating handle; the valve core is provided with a semi-elliptical or semi-rectangular combined fluid pylome; when the switch valve is opened clockwise, the semi-elliptical pylome of the valve core is communicated with an inlet of the valve sleeve first in order to help to prevent producing direct water hammer at certain opening amount; in the late stage of the opening, the semi-rectangular pylome is communicated with the inlet of the valve sleeve to realize rapid opening and help to ensure the total openingtime unchanged; otherwise, when the switch valve is closed, the semi-rectangular pylome of the valve core is communicated with an outlet of the valve sleeve; and the closing is implemented first so that the rising value of the water hammer pressure of a system is the smallest or is less than a pre-given value. The water hammer preventing switch valve with the structure can actively prevent the damage of water hammer, reduce preventive measure and has the advantages of simple structure, low cost, small occupied area, remarkable pressure limiting effect and the like.

Description

technical field [0001] The present invention relates to an anti-shock switch valve, in particular to a switch valve with semi-elliptical and semi-rectangular combined fluid through-holes through the valve core, so that the rise value of the fluid water hammer pressure generated by it is minimal or less than a predetermined value. Value, used in oil field oil recovery, mechanical flow field. Background technique [0002] The opening and closing of the normal on-off valve, flow adjustment or personnel misoperation in the fluid delivery system will cause the fluid in the system to be in a hydraulically unstable flow process, thereby forming a reciprocating transient pressure wave in the system. This hydraulic transient process is also called water hammer, which may cause the pressure of the flow system to rise or fall suddenly, so as to cause damage to the structure or performance of the system and cause operational accidents. The production system of the oil field is characte...

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