Hidden stem valve opening indicator

Abstract

The invention relates to a hidden stem valve opening indicator which comprises a sleeve. A cavity is formed in the sleeve. A cavity head is placed in the sleeve. A thread is arranged on the inner wall of the cavity head. A transmission rod is screwed into the cavity head. The transmission rod is connected with a connecting column which extends out of the sleeve and is provided with an inner square head. A through hole is formed in the portion, at the other end of the cavity head, in the sleeve and is an indication hole. An indicator rod is inserted into the indication hole of the sleeve and connected with the cavity head. A locating key groove is formed in the outer wall of the cavity head. A locking screw is inserted into a locating hole formed in the sleeve. The lower end of the locking screw abuts against the locating key groove. By the adoption of the technical scheme, opening and closing of a valve can be judged fast and easily, time for a site operator to judge the opening and closing state of the valve is shortened, under the emergency circumstances, risks and hidden danger are reduced, and construction safety is further guaranteed.

Description

technical field [0001] The application relates to an indicating device for indicating the valve seat switch of a dark rod flat valve. Background technique [0002] There are two main types of plate valves, one is the rising stem valve, and the valve can be judged by observing the rise and fall of the valve stem during the opening and closing process. The other is the hidden stem valve, the valve stem keeps the overall height unchanged during the valve operation process, and the switch of the valve cannot be observed through the lifting and lowering of the valve stem. The on-site operators often need to judge the opening state of the valve by testing the switch. Using the oil production wellhead to carry out testing operations such as replacing nozzles and measuring static pressure requires frequent switching and switching of valves. Due to the design of the dark stem valve itself, the switching status of the valve cannot be quickly judged, which brings safety hazards to the ...

AI Technical Summary

Problems solved by technology

The other is the hidden stem valve, the valve stem keeps the overall height unchanged during the valve operation process, and the switch of the valve cannot be observed through the lifting and lowering of the valve stem. The on-site operators often need to judge the opening state of the valve by testing the switch. Using the oil production wellhead to carry out testing operations such as changing the nozzle and measuring the static pressure requires frequent switching and switching of the valve. Due to the design of the dark stem valve itself, the switching status of the valve cannot be quickly judged, which brings safety hazards to the operation.

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