Compact rising stem gate valve

Abstract

The invention discloses a compact-type rising-stem gate valve which comprises a hand wheel, a screw rod, a valve-stem nut and a support. The cross section of a screw cap of the valve-stem nut is polygonal and the longitudinal section of the same is wedged, a sunken platform matched with the screw cap of the valve-stem nut in shape is arranged at the position where the hand wheel is matched with the valve-stem nut, a triangular boss protruding outwards is arranged at the bottom edge of the valve-stem nut, and a triangular groove matched with the triangular boss in shape is arranged at the position where the support is matched with the valve-stem nut. The compact-type rising-stem gate valve has the advantages that torque the hand wheel passes to the valve-stem nut is increased since the screw nut of the valve-stem nut is polygonal, and the triangular boss structure arranged at the bottom edge and protruding outwards get rid of connecting pieces of check head screws, fine threads and the like, therefore the compact-type rising-stem gate valve is low in cost, simple in structure, easy to assemble, reliable in work and long in service life; friction vibration between the hand wheel and the support can be alleviated through a gasket, and abrasion between the hand wheel and the support is avoided; made of aluminum bronze, the valve-stem nut is high in strength and good in abrasion performance and corrosion resistance.

Description

technical field [0001] The present invention relates to a rising stem gate valve, in particular to a compact rising stem gate valve. Background technique [0002] At present, gate valves are widely used in pipelines in petroleum, chemical, pharmaceutical, metallurgy, coal, power industry, urban water supply and drainage and other industries to control the flow and cut-off of pipeline media, and are the most widely used in various fluid conveying projects. one of the valves. The gate valve is an opening and closing part, the valve plate moves in the vertical direction of the center, the upward movement is the open valve, and the downward movement is the closed valve. When the handwheel drives the nut to make a circular motion, the valve stem drives the valve plate to move in a straight line, so as to achieve the opening and closing of the valve plate, so that the gate valve can meet the opening and closing function. [0003] The driving part of the rising stem gate valve is...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the assembly relationship between the existing valve stem nut and the handwheel is complicated, and connecting parts such as fine teeth need to be used, the assembly steps are cumbersome and the cost is high. In addition, the valve stem nut has a large volume and a short service life. The structure is not compact, so a compact rising stem gate valve is provided

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