Flow channel port surface structure of high flow coefficient valve body

Abstract

The invention relates to a flow channel port surface structure of a high flow coefficient valve body, being a port surface structure of a flow channel formed in the valve body. The cross-section shapeof the flow channel port of the flow channel is of a bilateral symmetrical structure, the cross section of the flow channel port of the flow channel is wide at the upper end and narrow at the lower end, and the corners of the cross section of the flow channel port of the flow channel are cambered. The flow channel structure of the valve body is optimized. The flow channel structure has no dead angle which is possible to deposit a medium, and therefore the flow capacity of the valve is increased. Meanwhile, based on the optimization of the flow channel structure, the sealing area of the part needing to be sealed of the valve is increased, and the safety and reliability of sealing of the valve are improved. The valve body structure eliminates a pressure relief groove in the sealing surfaceof the valve body, and the pressure relief groove is transferred onto a diaphragm assembly, so the difficulties of the design and process of the pressure relief groove in the valve body are avoided, the stress concentration of a valve body notch on a diaphragm is eliminated, the possibility of diaphragm wear and damage is reduced, and the service life of the diaphragm is prolonged.

Description

technical field [0001] The invention relates to a valve body structure, in particular to a flow passage opening surface structure of a high flow coefficient valve body. Background technique [0002] The nuclear-grade M-type straight-through diaphragm valve is one of the most commonly used diaphragm valves in domestic nuclear power plants. This series of valves adopts no stuffing box structure. The diaphragm is used as the middle flange seal and valve sealing component, and also as a barrier to isolate the valve body and bonnet. , The seal is safe and reliable. [0003] The Chinese patent with the publication number CN103527812A discloses a nuclear-grade M-type pneumatic straight-through diaphragm valve, including a valve body, a diaphragm, a valve disc, a valve cover, a valve stem, an adjusting screw, a handwheel rod, a handwheel, a cylinder, a bracket, an indication Rod and guide plate; the valve body is connected with the valve cover to form a space to accommodate the val...

AI Technical Summary

Problems solved by technology

[0005] However, at present, M-type straight-through diaphragm valves generally have problems such as low flow coefficient, large flow resistance, and short service life of the diaphragm.

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