Pilot-operated type solenoid valve for gas well wellhead and valve plug lifting mechanism

Abstract

The invention discloses a lifting mechanism for a valve plug of a solenoid valve. The lifting mechanism comprises a supporting plate arranged above a valve cap, wherein the upper end of a lifting rod of a main valve plug penetrates through the supporting plate; a rack extending along the length direction of the lifting rod is arranged on the lifting rod; a connector I is arranged on the upper surface of the supporting plate; a transmission shaft is rotatably arranged on the connector I; a gear which is engaged with the rack is arranged on one end of the transmission shaft; a ratchet wheel is arranged on the other end of the transmission shaft; the lifting rod is vertically arranged on the upper surface of the supporting plate; a long lever which is horizontally distributed is rotatably connected on the upper end of the supporting rod; the connection point of the supporting rod and the long lever deviates from the centre in the length direction of the long lever; the long lever is arranged above the ratchet wheel; and a pawl which is matched with the ratchet wheel is fixedly arranged on the long lever. The invention further discloses a pilot-operated type solenoid valve for a gas well wellhead adopting the valve plug lifting mechanism. The pilot-operated type solenoid valve for the gas well wellhead and the valve plug lifting mechanism can greatly increase the opening height of the solenoid valve main valve plug, increases the yield and prevents throttling.

Description

technical field [0001] The invention relates to a pilot solenoid valve and a valve core lifting mechanism, in particular to a pilot solenoid valve and a valve core lifting mechanism for a wellhead of a gas well. Background technique [0002] At present, solenoid valves are widely used as safety shut-off valves at wellheads of gas wells. However, the opening height of the spool of the traditional solenoid valve is limited, and throttling often occurs, which affects the production efficiency of the gas well. Or increase the opening height of the main spool of the solenoid valve by means of emptying, which will pollute the environment and cause potential safety hazards. In addition, when the pressure fluctuation of the gas source output by the gas well is too large, such as when the gas source pressure is too high, the gas source with too high pressure is easy to damage the solenoid valve. When the gas source pressure is too low and the solenoid valve needs to be closed, the t...

AI Technical Summary

Problems solved by technology

However, the opening height of the spool of the traditional solenoid valve is limited, and throttling often occurs, which affects the output efficiency of the gas well

Or increase the opening height of the main valve core of the solenoid valve by emptying, which will pollute the environment and cause safety hazards

In addition, when the pressure fluctuation of the gas source output by the gas well is too large, such as when the gas source pressure is too high, the gas source with too high pressure is easy to damage the solenoid valve. When the gas source pressure is too low and the solenoid valve needs to be closed, the traditional The cut-off valve cannot be closed in time according to the pressure of the air source, and it cannot play the role of emergency cut-off under the condition that the installation of Arai digital transmission is not in place, the remote transmission control fails, and the power supply is insufficient, which greatly limits the scope of use of the solenoid valve

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