A kind of fixing method of nuclear grade swing check valve disc

Abstract

The invention provides a fixing method for a valve clack of a nuclear grade swing check valve. The fixing method includes the steps that a valve deck of the check valve is opened; a connecting arm of the valve clack is welded to a valve clack pull ring; a valve cavity inner wall upper pull ring is welded to the position near a valve deck flange; an elastic pull rod is made of a 304 stainless steel wire according to the model of the swing check valve, one end of the elastic pull rod is provided with a round pull ring, and the other end of the elastic pull rod is provided with a horn hook; the round pull ring of the elastic pull rod is connected with the valve clack pull ring in a buckling mode; the valve clack is pulled upwards to a preset height through the elastic pull ring, and the horn hook of the elastic pull rod is hung on the valve cavity inner wall upper ring; the valve deck of the check valve is closed. Through the method, the valve clack of the authenticated nuclear grade swing check valve is located at a preset opening position before impact of reverse fluid, the valve clack can automatically get rid of limit under the impact of the reverse fluid and successfully fall down so as to close the valve after the experiment begins, and therefore a countercurrent experiment of a function authentication experiment of the nuclear grade swing check valve is finished auxiliarily.

Description

technical field

[0001] The invention relates to the field of reverse flow test of a nuclear-grade check valve function appraisal test, in particular to a method for fixing a disc of a nuclear-grade swing check valve. Background technique

[0002] In the American ASME QME-1-2002 standard, there is a corresponding description of the reverse flow test requirements in the functional qualification test of the nuclear check valve, that is, a test that produces an instantaneous closing speed needs to be established in the reverse flow test. Under the reverse impact, it reaches the closed state instantaneously from the predetermined open state, but does not point out the specific implementation method. There are no public reports on specific implementation methods both at home and abroad. Such as figure 1 As shown, it is a structural schematic diagram of a nuclear grade swing check valve in the prior art. The swing check valve includes a valve body 1, a valve cover 2, a valve cove...

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