Valve rod anti-back-off device and method for high-pressure valve convenient to observe

Abstract

The invention discloses a valve rod anti-back-off device and method for a high-pressure valve convenient to observe. The valve rod anti-back-off device comprises a valve body, a valve cover, a valve rod and a hand wheel, and further comprises a limiting mechanism, wherein a base is connected on the valve body; a rotary disc is rotatably connected above the base; the top surface of the rotary discis connected with a sleeve; an inner rod is arranged in the sleeve in a sliding mode; a first spring is connected between the bottom of the inner rod and the top surface of the rotary disc; the sleeveis transparent, and scales are arranged on the outer wall of the sleeve; a pointer is connected on the side wall of the inner rod; a blocking hole which is adaptive to the inner rod is formed in thebottom surface of the hand wheel; the limiting mechanism comprises a friction head; the friction head is hinged on a bracket; the bracket is fixedly connected with the base; the valve body is furtherequipped with a stand column; the side wall of the stand column is hinged with a rocker arm; the rocker arm is connected with the friction head through a steel wire rope; a first through hole is formed in the stand column; a limiting rod is arranged in the first through hole in a penetrating mode; and the rocker arm is blocked at one side of the limiting rod. The valve rod anti-back-off device issimple in structure, is reasonable in design, can effectively prevent the valve rod from backing off, and further can observe and judge the anti-back-off effect, so that problems are timely found.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to an easy-to-observe device and method for preventing back-off of a valve stem 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. 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 o...

AI Technical Summary

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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