Low-voltage triggering type compression bar unstability wellhead shutdown valve
A low-pressure trigger and shut-off valve technology, which is applied to wellbore/well valve devices, wellbore/well parts, earthwork drilling and production, etc., can solve the problem of the reliability drop of the shut-off valve system, and achieve movement reliability and The effect of high sealing reliability, high triggering accuracy and short operating time
Inactive Publication Date: 2013-12-25
JIANGSU RELIABLE MECHANICAL EQUIP CO LTD
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Problems solved by technology
These factors will cause the reliability of the entire shut-off valve system to decline
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[0016] A low-pressure triggered pressure rod instability wellhead shut-off valve, its main components include a piston 1, a valve body 2, a valve disc 3, a valve seat 4, a stopper 5, a valve stem 6, a valve cover 7, a spring 8, and a spring stopper Sheet 9, slender rod 10, rod cage 11, rod cap 12, reset bolt 13. Such as figure 1 shown. Among them, the slender rod 10 is the trigger component of the low-pressure trigger type pressure rod instability wellhead shut-off valve, and the joint action of it and the spring 8 replaces the hydraulic control system of the traditional wellhead shut-off valve functionally.
[0017] The specific embodiment of the present invention is: the upper end of the valve rod 6 is connected with the slender rod 10, while the valve rod 6 passes through the spring 8, the block 5 and the valve disc 3, and is connected with the piston 1 at the lower end. The upper surface of the piston 1 bears the medium pressure in the cavity of the valve body 2, and the...
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The invention relates to a low-voltage triggering type compression bar unstability wellhead shutdown valve, which comprises the following main components of a piston, a valve body, a valve clack, a valve seat, a stop dog, a valve bar, a valve deck, a spring, a spring catch, a thin and long bar, a bar cage, a bar nut, a rest bolt and the like. The shutdown valve is provided with a piston structure communicated with the outside, and the shutdown triggering mechanism of the shutdown valve is designed according to the compression bar unstability principle; when the pressure in a pipeline is higher than a specific point, axial force borne by the thin and long bar is lowered than the compression bar unstability critical load, the compression bar is kept stable, fluid can flow through a cavity between the valve clack and the valve bar, and the valve is under the opening state; when the pressure in the pipeline is lowered than the specific point, the load borne by the thin and long bar exceeds the compression bar unstability critical load, the compression bar is unstable, the effective length of the compression bar is reduced instantaneously, the valve bar upwards moves under the thrust action of the spring, and the valve clack enters the valve seat to shut down the valve to cut off the fluid. The valve has the advantages of simple structure and higher reliability, and the valve is only provided with two movement components.
Description
technical field [0001] The invention relates to a low-pressure trigger wellhead safety shut-off valve for ensuring the safety of site equipment or gas pipelines in natural gas production and transportation well sites. Background technique [0002] A low-pressure triggered wellhead safety shut-off valve to control the output of natural gas is installed on the ground of the natural gas production and transportation well site. This is because the failure or fracture of downstream pipelines, valves or equipment will cause the pressure in the pipeline to drop. loss. The function of this safety shut-off valve is to close the natural gas passage when the pipeline pressure drops to a certain value, thereby reducing the leakage of natural gas, reducing air pollution, reducing fire hazards and economic losses. [0003] At present, most wellhead safety shut-off valves are composed of two parts: shut-off valve and hydraulic control system. Usually, the various functional components o...
Claims
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IPC IPC(8): E21B34/02
Inventor 刘海亮王磊王福凯
Owner JIANGSU RELIABLE MECHANICAL EQUIP CO LTD