Novel stop valve

Abstract

The invention relates to a novel stop valve. The novel stop valve comprises a valve body, and an inlet channel and an outlet channel for allowing media to circulate thereinare formed in the bottom of the valve body; a valve cover is arranged at the upper end of the valve body, a valve rod penetrating the valve cover is arranged in the valve body, the lower end of the valve rod is connected with a valve head, a step is arranged at the inner end of the outlet channel of the valve body, and a movable valve seat is arranged in the step; a sealing pair is formed through matching of the movable valve seat and the valve head, the valve head is sleeved with a guide sleeve and is located in the valve body, the lower end of the guide sleeve abuts against the movable valve seat, the upper end of the guide sleeve is provided with a locking nut, and the locking nut is in threaded connection with an inner cavity of the valve body; and a plurality of through holes are formed in the sleeve wall of the guide sleeve. The novel stop valve is simple in structure and convenient to manufacture, the movable valve seat is arranged at the inner end of the outlet channel, and after the sealing face of the movable valve seat is damaged, the movable valve seat can be conveniently replaced and maintained; and the valve head is sleeved with the guide sleeve, it is ensured that the valve head can be accurately sealed with the valve seat, the through holes are additionally formed in the sleeve, scouring of the media to the sealing pair is reduced, and the sealing effect is improved.

Description

Technical field [0001] The invention relates to a novel cut-off valve, which belongs to the technical field of valves. Background technique [0002] The cut-off valve, also called the cut-off valve, is one of the most widely used valves. The reason why it is so popular is that the friction between the sealing surfaces is small during the opening and closing process, which is relatively durable, has a low opening height, and is easy to manufacture. , Easy maintenance, not only suitable for low pressure, but also suitable for high pressure. The closing principle of the globe valve is to rely on the pressure of the valve stem to make the sealing surface of the disc and the sealing surface of the valve seat closely fit to prevent the medium from flowing. Some of the existing Y-shaped globe valves mostly use stellite alloy surfacing on the valve body. This process is cumbersome, and it is difficult to operate large-diameter globe valves. The sealing surface of the valve body is relat...

AI Technical Summary

Problems solved by technology

Some existing Y-type globe valves are mostly sealed with stellite alloy body. This process is cumbersome and difficult to operate for large-diameter globe valves. The sealing surface of the valve body is easily damaged during use, and it is difficult to Realize maintenance and replacement, which reduces the sealing effect, thus affecting the normal operation of the equipment; the disc is driven by the valve stem to move in the valve body, and sometimes the sealing surface of the disc and the sealing surface of the valve seat are easily misaligned, resulting in leakage and reducing the sealing Effect

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