An easy-to-observe valve stem anti-retraction device and method for high-pressure valves

Abstract

The invention discloses an easy-to-observe device and method for preventing the valve stem from retreating for a high-pressure valve, comprising a valve body, a valve cover, a valve stem, and a hand wheel. The valve body is connected with a base; A sleeve is connected to the top surface, and an inner rod is provided for sliding inside the sleeve, and a first spring is connected between the bottom of the inner rod and the top surface of the turntable; the sleeve is transparent, and scales are provided on the outer wall; the side wall of the inner rod There is a pointer on the top; the bottom surface of the hand wheel is provided with a card hole that matches the inner rod; it also includes a limit mechanism, including a friction head, which is hinged on the bracket, and the bracket is fixedly connected to the base; the valve body is also provided with a column, A rocker arm is hinged on the side wall of the column, and the rocker arm is connected with the friction head through a wire rope; the column has a first through hole, and a limit rod is pierced in the first through hole, and the rocker arm is clamped on one side of the limit rod. The invention has simple structure and reasonable design, can effectively prevent the valve stem from retreating, and can observe and judge the anti-retreating effect at the same time, so as to find problems in time.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a valve stem anti-return device and method for a high-pressure valve that is easy to observe. Background technique [0002] The high-pressure valve is one of many valves. When the high-pressure valve is in use, it is exposed to the outside world. Due to the lack of obstruction of the valve stem, and the handwheel connected to the valve stem, there is no limit set. Accidental touch, or due to the high pressure of the fluid in the valve, the valve stem is prone to retreat, resulting in fluid leakage. After searching, in the current prior art, the invention patent with the authorization announcement number CN109931430B discloses a valve stem anti-return device for high-pressure valves that is easy to observe. Although it can solve the problem of valve stem back There are also the following problems: (1) The above-mentioned authorized patent can only be used in a specific state. In t...

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Problems solved by technology

[0002] The high-pressure valve is one of many valves. When the high-pressure valve is in use, it is exposed to the outside world. Because the valve stem is not blocked, and the handwheel connected to the valve stem has no limit, non-operators may turn incorrectly or Inadvertent touch, or due to the high pressure of the fluid in the valve, the valve stem is prone to retraction, resulting in fluid leakage

After retrieval, in the current prior art, the invention patent with the authorized announcement number CN109931430B discloses an easy-to-observe valve stem anti-retraction device for high-pressure valves. Although it can solve the problem of valve stem retraction, its There are still the following problems: (1) The above-mentioned authorized patent can only be used in a specific state. In this specific state: since the handwheel is only provided with limiting grooves on both sides, and the movable round rod cannot move along the circumferential position, only Only when the limit groove and the movable round rod are aligned in the vertical direction can the movable round rod be inserted into the limit groove, which has certain limitations in use. When the high-pressure valve is opened, the position of the handwheel is uncertain. When the limit groove and the movable round rod cannot be aligned in the vertical direction, the limit of the hand wheel cannot be realized, and the problem of accidental touch or wrong rotation by non-operators cannot be solved; When positioning, the operation steps are too cumbersome, moving the connecting bar-inserting the movable round rod into the limit slot-inserting the pin into the through slot, it is time-consuming and laborious, the efficiency is low, and the pin is easy to lose, which needs to be improved

(3) The anti-rollback effect of the above-mentioned authorized patents is not easy to reflect. Once there is a problem with the anti-rollback, it is difficult for the staff to find out, which will lead to subsequent troubles

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