A device and method for anti-rollback of a valve stem for a high-pressure valve

Abstract

The invention discloses a device and method for preventing a valve stem from retreating for a high-pressure valve, comprising a valve body, a valve cover, a valve stem, and a hand wheel. There is a sleeve, inside the sleeve there is an inner rod that cooperates and slides, and the first spring is connected between the bottom of the inner rod and the top surface of the turntable; the bottom surface of the hand wheel is provided with a card hole that matches the inner rod, and the top of the inner rod is inserted into the In the card hole; it also includes a limit mechanism, including a friction head, the friction head is connected with a moving rod, and the end surface of the moving rod is arranged on an inclined surface; it also includes a vertically arranged slide rail, which is fixedly connected to the valve body, and the slide rail One side is slidingly connected with a wedge, and the wedge is adapted to the end of the moving rod; the top surface of the base is hinged with a rocker, and the rocker is in contact with the top of the wedge; the slide rail is slidingly connected with a limit rod, and the rocker is clamped on the Bottom of stop bar. The invention has simple structure and reasonable design, can effectively prevent the valve stem from retreating, saves time and effort, and has small limitations.

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. 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. Although it can solve the problem of valve stem retraction, it still has the following problems in the use process. Problems: (1) The above-mentioned authorized patents can only be used in a specific state. In this specific ...

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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 searching, in the current prior art, the invention patent with the authorized announcement number CN109931430B discloses a valve stem anti-retraction device for high-pressure valves. Although it can solve the problem of valve stem retraction, it still has the following problems during use: Problem: (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 the limiting grooves When the movable round rod is vertically aligned, the movable round rod can 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 When the groove and the movable round rod cannot be aligned in the vertical direction, the position limit of the hand wheel cannot be realized, and the problem of accidental touch or wrong rotation by non-operators cannot be solved; (2) when the above-mentioned authorized patent is limited by the hand wheel, 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

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