Shrinking-drawing gate valve

Abstract

The invention discloses a shrinking-drawing gate valve which is composed of a valve body (13), a valve rod (12), a flash board (10), a hand wheel (1) and a bearing cover (11). The shrinking-drawing gate valve is characterized in that the cavity of the valve body (13) is provided with enough space so that the flash board can extend into the middle of the cavity of the valve body (13) from a water inlet flange mouth (18) and incline upwards to be perpendicular to a medium drift diameter tube; screw threads are arranged at the upper part and lower part of the valve rod (12) along the opposite directions; and the hand wheel (1) is equipped with two or more than two locking holes (32), and the bearing cover (11) or a valve cover (28) is equipped with a lock hole. In the invention, by means of the method of driving the flash board (10) to go up and down by the designed valve rod (12) and the designed hand wheel (1), the efficiency of the valve rod (12) for driving the flash board (10) is greatly improved, and the speed is accelerated by over 2 times; by adopting the designed valve body (13), part of the fabrication cost of the valve cover (28) and a gland cover (29) is saved; and the designed anti-theft lock of the valve has simple structure and low fabrication cost.

Description

technical field [0001] This invention relates to a retractable gate valve, which is composed of a valve body, a valve cover, a gate plate, a valve seat, a valve stem and a hand wheel, and the valve stem is driven by the hand wheel to make the gate lift up and down along the sealing surface of the valve seat sports. Background technique [0002] Gate valves can be divided into two types according to the thread of the valve stem. One is the open rod type, and the other is the dark rod type. The bright rod type is commonly known as the pull rod type. The fixed rotation of the rod will drive the lifting nut to lift the gate, but the common disadvantage of these two methods is that the lifting speed is slow. Because the gate valve is used in a wide range, such as large sewage plants, oil plants, shipyards, urban construction pipelines and Gate valves are generally used for fire protection, etc. If an emergency occurs and the inlet and outlet need to be closed or opened immediate...

AI Technical Summary

Problems solved by technology

[0002] Gate valves can be divided into two types according to the thread of the valve stem. One is the open rod type, and the other is the dark rod type. The bright rod type is commonly known as the pull rod type. The fixed rotation of the rod will drive the lifting nut to lift the gate, but the common disadvantage of these two methods is that the lifting speed is slow. Because the gate valve is used in a wide range, such as large sewage plants, oil plants, shipyards, urban construction pipelines and Gate valves are generally used for fire protection, etc. If an emergency occurs and the inlet and outlet need to be closed or opened immediately, the slow speed of the gate valve will cause undue losses. Of course, electric devices have also appeared to replace manual operations. However, the added cost sometimes greatly exceeds the loss that should not be incurred in emergencies.

Among the existing valves, there are already various kinds of anti-theft locks on the valves, but the tie-rod valve greatly increases the difficulty of setting anti-theft locks, and the cost also increases accordingly.

[0003] The Chinese invention patent application number is: 200910179231.2 has announced a kind of anti-theft speed rotary valve, and it is to be provided with valve stem, gate plate and valve seat in the valve body, and it is that gate valve is stretched into installation from bore opening, and in valve body There are first bumps, second bumps and third bumps on the gate and the gate, and the valve stem is very easy to get stuck during operation. Secondly, it has a spiral track on the valve stem, and the amplitude of the spiral track is that of the valve stem. It is easy to appear the phenomenon of sliding bar

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