Large-diameter nuclear-grade M-shaped straight-through type electric diaphragm valve

Abstract

The invention relates to a large-diameter nuclear-grade M-shaped straight-through type electric diaphragm valve. The large-diameter nuclear-grade M-shaped straight-through type electric diaphragm valve comprises a valve body, a valve deck, a valve rod, a valve clack, an electric device and a diaphragm; the outer side of the valve clack is provided with a guiding key in the axial direction, the inner side of the valve deck is provided with a guiding groove, and the guiding key is embedded into the guiding groove; the outer edge of the diaphragm is clamped between the valve body and the valve deck; and the middle of the diaphragm is provided with a pressure relieving groove. Compared with the prior art, the structure is simple and compact, the gravity center is low, and the shock resistanceis good; maintenance is convenient, and disassembling and assembling can be completed without special tools; the electric device and a bushing can achieve online disassembling and assembling while thevalve position is kept; a metal-to-metal connecting sealing structure is adopted, therefore, the stress brought by the outside to the diaphragm is avoided, and the service life of the diaphragm is prolonged; and the diaphragm is provided with the pressure relieving groove, the problem that the valve can not be opened due to the fact that pressurizing is conducted when the valve is closed can be well solved, the casting / machining technology requirements are reduced, and batch production can be better achieved.

Description

technical field [0001] The invention belongs to the technical field of diaphragm valves, and relates to a large-diameter nuclear-grade M-type through-type electric diaphragm valve. Background technique [0002] The diaphragm valve uses the diaphragm as the opening and closing part, and the valve stem is driven by the handwheel or electric drive device to move up and down along the axis, and the driving part is isolated from the medium. The main function is to connect or cut off the medium in the pipeline and control the medium. Flow opening and closing device. [0003] Since the diaphragm is a key part of the opening, closing and sealing of the diaphragm valve, its quality directly affects the sealing performance and service life of the valve. Therefore, the structure and material of the rubber diaphragm will play an important role in the sealing performance and service life of the diaphragm valve. Crucial role. [0004] In addition, when the diaphragm valve is opened, a l...

AI Technical Summary

Problems solved by technology

However, the problem with this method is that the notch of the valve body causes the stress concentration effect of the fluid on the diaphragm, which reduces its service life. At the same time, it also improves the casting / machining process requirements and increases the scrap rate.

[0005] At present, the nuclear grade diaphragm valve with the largest diameter (DN150) at home and abroad is a weir structure, and its design parameters are lower than that of the straight-through structure, which cannot meet the higher requirements of the use site.

Images