Assembling method of scraper stop valve

Abstract

The invention relates to an assembling method of a scraper stop valve. The assembling method comprises the following steps: a, cleaning components by using clean water, and blow-drying by using a dryer; b, assembling a valve body and a valve seat; c, assembling an external valve rod, a valve clack and other components; d, assembling an internal valve rod, a scraper assembly, a plug head and other components; e, assembling an assembly obtained in the step c and an assembly obtained in the step d; f, assembling a valve cover assembly, and integrally assembling; g, assembling a valve rod nut, a limiting sleeve, a big hand wheel and other components; h, assembling a small hand wheel and other components; i, performing a pressure test; j, blow-drying the scraper stop valve passing the test, then painting, performing lead sealing, and storing. The assembling method has the advantages of convenience in mounting, high accuracy and high qualified rate.

Description

technical field [0001] The invention relates to a shut-off valve, in particular to an assembly method for a shut-off valve with a scraper. Background technique [0002] As an extremely important cut-off valve, the globe valve is sealed by applying torque to the valve stem, and the valve stem exerts pressure on the valve disc in the axial direction, so that the sealing surface of the valve disc and the sealing surface of the valve seat fit closely, preventing The medium leaks along the gap between the sealing surfaces. The sealing pair of the globe valve is composed of the disc sealing surface and the valve seat sealing surface. The valve stem drives the valve disc to move vertically along the center line of the valve seat. When the valve is used in viscous ore slurry containing solid particles, the medium is easy to stick to the sealing pair, so that the sealing surface of the valve disc and the seat sealing surface cannot be tightly combined, resulting in leakage, and the s...

AI Technical Summary

Problems solved by technology

[0002] As an extremely important cut-off valve, the globe valve is sealed by applying torque to the valve stem, and the valve stem exerts pressure on the valve disc in the axial direction, so that the sealing surface of the valve disc and the sealing surface of the valve seat fit closely, preventing The medium leaks along the gap between the sealing surfaces. The sealing pair of the globe valve is composed of the disc sealing surface and the valve seat sealing surface. The valve stem drives the valve disc to move vertically along the center line of the valve seat. When the valve is used in viscous ore slurry containing solid particles, the medium is easy to stick to the sealing pair, so that the sealing surface of the disc and the seat cannot be tightly combined, resulting in leakage. At the same time, the solid particles contained in the medium are trapped On the sealing pair, it is easy to damage the sealing pair and the service life is short

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