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Expansion flat gate valve

A flat gate valve, expansion type technology, applied in the direction of sliding valve, valve device, engine components, etc., can solve the problems of easy leakage, valve cover sealing ring and valve stem sealing pressure, etc., to improve sealing performance, sealing performance Good, prevent leakage effect

Inactive Publication Date: 2011-01-19
BOTELI VALVE GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: in the open state of the valve, there is a non-sealed fit between the gate and the valve seat, the medium in the channel is filled with the entire valve cavity, and the medium in the valve cavity cannot be released when the valve is open, which has a negative effect on the sealing ring of the bonnet and the valve stem. The seal bears heavy pressure and is easy to leak

Method used

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Embodiment Construction

[0007] Such as figure 1 The expansion slab gate valve shown includes a valve body 1, a valve seat 2, a valve stem 7 and a gate plate. The gate plate is composed of a main gate plate 5 and a secondary gate plate 6. The upper end of the main gate plate 5 is fixedly connected to the lower end of the valve stem 7. , There is a V-shaped matching slope between the contact surfaces of the main gate 5 and the slave gate 6, and a lever lock mechanism is provided on the side planes of the master gate 5 and the slave gate 6. Described lever lock mechanism is made up of lever arm 4 and pendulum block 10, and pendulum block 10 is fixedly connected on the lower end of lever arm 4 by connecting pin 9, and the upper end of lever arm 4 is shaped on left and right two positioning grooves, left, right The two right locating grooves are movably installed on the main ram 5 and the slave ram 6 respectively by the pin shaft 8, wherein the left locating groove is movably positioned on the main ram 5 ...

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Abstract

The invention relates to an expansion flat gate valve which comprises a valve body, valve seats, a valve rod and gates, wherein the gates comprise a main gate and a slave gate; the upper end of the main gate is fixedly connected with the valve rod; a V-shaped matching inclined plane is arranged between the contact surfaces of the main gate and the slave gate; a lever lock mechanism is arranged on the side planes of the main gate and the slave gate; and guide plates are symmetrically installed on the outer walls of the two valve seats on the left and right of the valve body. When the valve is in a fully closed or fully open state, the gates and the valve seats are in the hermetic matching state, and a middle cavity of the valve body is isolated from the medium pressure of a passage, thereby improving the sealing property of the valve cap and the valve rod communicated with the middle cavity of the valve body and preventing leakage. In the process of opening and closing the valve, the gates and the valve seats are in a disengaged state all the time, thereby reducing the friction of a sealing pair, and having the advantages of small wear, good sealing property and the like. The expansion flat gate valve is especially suitable for a flat gate valve of a large-diameter pipeline.

Description

technical field [0001] The invention belongs to valves, in particular to a wedge-shaped expansion flat gate valve. Background technique [0002] The structure of the wedge-shaped slab gate valve includes a valve body, a valve stem, left and right gates, and wedge blocks. For example, the retractable slab gate valve whose patent number is ZL99246370.X, its gate adopts a retractable double gate structure, and the middle section of the two gates is made into a figure-eight slope, and a wedge-shaped block is arranged in the middle of the slope. When opening, the wedge-shaped block is lifted first, so that the left and right gates are separated from the valve seat and then lifted; when closing, the left and right gates move to the position first and then stretch out to seal with the valve seat, which can reduce the wear of the sealing pair. Its disadvantages are: in the open state of the valve, there is a non-sealed fit between the gate and the valve seat, the medium in the chan...

Claims

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Application Information

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IPC IPC(8): F16K3/18F16K3/312F16K3/30
Inventor 金克雨秦永亚缑志奇
Owner BOTELI VALVE GROUP
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