Using method of scraper stop valve

Abstract

The invention relates to a using method of a scraper stop valve. The using method comprises the following steps: from an open state to a closed state, lifting a positioning pin till the two ends of the positioning pin are clamped into a concave seam allowance respectively, clockwise rotating a small hand wheel to drive an internal valve rod and a scraper assembly to rotate, outwardly moving a cutter head, and moving an upper scraper to a valve clack sealing surface; anticlockwise and outwardly rotating a big hand wheel to drive a valve clack, the scraper assembly, a plug head and other components to move downward till a lower scraper contacts a valve seat sealing surface, continuing rotating the small hand wheel for a round clockwise, then anticlockwise rotating the small hand wheel till the head of an inclined rod contacts a baffle block, continuing rotating the small hand wheel anticlockwise to drive the cutter head to move inward, moving the upper scraper and the lower scraper away from the valve clack sealing surface and the valve seat sealing surface respectively, and stopping rotating the small hand wheel; moving the positioning pin away from the concave seam allowance, moving downwardly, and clamping the two ends of the positioning pin into a clamping slot; continuing rotating the big hand wheel anticlockwise till the valve clack sealing surface presses against the valve seat sealing surface, and closing the valve. The using method of the scraper stop valve is simple; by the using method, wear of sealing surfaces is low and the service life of the scraper stop valve is prolonged.

Description

technical field [0001] The invention relates to a cut-off valve, in particular to a method for using a cut-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 solid p...

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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