Mechanical ultra-high pressure and ultra-low pressure emergency shut-off valve

Abstract

The invention relates to the technical field of gas field well opening valve maintenance, and particularly discloses a mechanical type ultra-high pressure and ultra-low pressure urgent intercepting valve. The urgent block valve comprises a valve body, a main valve core, a shifting fork, a sliding block, an air cylinder, an air cylinder spring and a straight line push rod motor. The shifting fork is arranged at the end of a push rod of the straight line push rod motor, the main valve core is provided with an open self-locking neck and a close self-locking neck which correspond to the position of the shifting fork, the air cylinder, the sliding block and the air cylinder spring are connected in sequence, the extension direction of the air cylinder is perpendicular to the extension direction of the straight line push rod motor, the sliding block is provided with a sliding groove and an circular arc-shaped notch, the push rod of the straight line push rod motor penetrates through the sliding groove of the sliding block, a sliding wheel is arranged on the push rod of the straight line push rod motor, the sliding wheel is matched with the notch of the sliding block in a contact mode, and the sliding block is provided with positioning necks which are arranged at two ends of the notch. It is achieved that the intercepting valve can be closed automatically in a mechanical control mode with no need for power under the ultra-high pressure and out-of-pressure conditions of a gas field well opening.

Description

technical field [0001] The invention relates to the technical field of gas field wellhead valve maintenance, in particular to a mechanical ultra-high pressure and ultra-low pressure emergency shut-off valve. Background technique [0002] At present, there are generally problems such as remote location and inconvenient transportation of gas field wellheads, and with the increase of gas field production and construction scale, the number of gas field wells is also increasing, so there are problems such as large maintenance workload of on-site wellhead valves, etc. Manual switch well can no longer adapt to this situation. [0003] In the prior art, the following two methods are usually used to solve the above problems: one is to control and adjust through the solenoid valve to adjust the opening and closing of the air inlet and the unloading port, and under the force of the main spring of the valve core, the valve can be reached. On and off, the ultra-low pressure protection f...

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Problems solved by technology

[0002] At present, there are generally problems such as remote location and inconvenient transportation of gas field wellheads, and with the increase of gas field production and construction scale, the number of gas field wells is also increasing, so there are problems such as large maintenance workload of on-site wellhead valves, etc. Manual switch well can no longer adapt to this situation

[0003] In the prior art, the following two methods are usually used to solve the above problems: one is to control and adjust through the solenoid valve to adjust the opening and closing of the air inlet and the unloading port, and under the force of the main spring of the valve core, the valve can be reached. On and off, the ultra-low pressure protection function is to increase the self-diagnosis function on the RTU on the wellhead radio station, set the overpressure and underpressure ranges, and the RTU will automatically command the solenoid valve to close after the oil pressure sensor signal changes to the overvoltage or undervoltage value. Both the valve body and the valve cover of the solenoid valve need to process air intake holes and unloading holes (the diameter is basically about 6mm), which greatly increases the difficulty and cost of processing, and the valve cannot be closed without electricity; One is to control the opening and closing of the valve through hydraulic means, mainly including hydraulic actuators, manual hydraulic pumps, control components and a reverse gate valve. The pressure pilot valve senses the pipeline pressure, and shuts off when the pipeline pressure exceeds or falls below the specified control range. This system adds a hydraulic control part, the price of the device is slightly higher, and attention should also be paid to the antifreeze of the hydraulic oil

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