Combined ball valve element

Abstract

The invention relates to a combined ball valve element. The combined ball valve element comprises a spherical valve element body and orifice plates. The top end of the valve element body is a valve stem joint, the middle part of the valve element body is a circular passage, one side of the passage is a small-hole spherical adjustment pair, and one orifice plate is arranged along the flow path in the circular passage of the valve element body. Throttle holes are formed in the lower portions of the orifice plates. One or more orifice plates are arranged in the upper space of the orifice plate and the circular passage, and no orifice plates are arranged in the lower space. The valve element is suitable for both small flow and high pressure differential conditions as well as for large flow andsmall differential pressure conditions, and a valve has a wide application range.

Description

technical field [0001] The invention relates to a combined ball valve core, which is suitable for working conditions where small flow and high pressure difference coexist with large flow and small pressure difference, and is used for ball valves in thermal power, nuclear power and petrochemical fields. Background technique [0002] The existing spools for ball valves with adjustable flow rate are "V"-shaped spools, small throttle holes + throttle orifice combined spools or circular through-hole spools. The adjustment accuracy of the circular through-hole spool is low; the "V"-shaped spool has a high adjustment accuracy for liquid media, but the adjustment effect for steam media is not ideal, especially in the case of high-pressure differential media, which is prone to erosion; The throttle hole + throttle orifice combined valve core is only suitable for high pressure differential conditions. However, at present, thermal power, nuclear power, and petrochemical equipment have...

AI Technical Summary

Problems solved by technology

The adjustment accuracy of the circular through-hole spool is low; the "V"-shaped spool has a high adjustment accuracy for liquid media, but the adjustment effect for steam media is not ideal, especially in the case of high-pressure differential media, which is prone to erosion; Throttle small hole + throttle orifice combined valve core is only suitable for high pressure differential conditions

However, at present, thermal power, nuclear power, and petrochemical equipment have working conditions where small flow and high pressure difference coexist, and large flow and small pressure difference coexist. The spool is not suitable for the above complex working conditions

Under the condition of high pressure difference, the "V"-shaped valve core and the circular through-hole valve core are prone to erosion, and the service life of the valve is short; the throttle hole + throttle orifice combined valve core is not suitable for large flow and small pressure difference Working conditions, the flow capacity of the spool is insufficient

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