Independent pilot-operated type flow control valve

Abstract

The invention discloses an independent pilot-operated type flow control valve, comprising a main valve. An actuator part is arranged on the main valve and consists of a hydraulic control element manifold block and a pilot-operated type overflow valve, wherein the hydraulic control element manifold block is fixed on an upper valve cover of the main valve, the pilot-operated type overflow valve is fixed on the hydraulic control element manifold block which is connected with an inlet front pipeline of the valve through a medium collecting inlet pipe fitting assembly, and the pilot-operated type overflow valve is connected with an outlet rear pipeline of the valve through an outlet pipe connector assembly. The hydraulic actuating element of the control valve is composed of the manifold block and the independent pilot-operated type overflow valve which are in linkage with each other, and the action execution and the adjustment control are stable and agile. A piston type valve core resists high pressure and has a good sealing property and a long service life. The independent pilot-operated type flow control valve can be automatically closed in a low pressure state, has a check function when applied to an oil extraction system, has a fireproofing and obstruction functions when applied to an oil transmission system of an oil depot, and effectively overcomes the defects in the prior art.

Description

technical field [0001] The invention relates to a flow control valve, in particular to a self-operated pilot type flow control valve. Background technique [0002] Flow control valves play a very important role in the process automatic control of modern oil production wells and petrochemical oil depot oil delivery systems. For example: the oil production well area injects water into the ground to pressurize the oil to be forced out of the oil production point, which requires a low-pressure check that is normally closed and a pipeline system that is automatically closed for safety protection at high pressure; The automatic shutdown at low pressure is used to prevent accidental fires in series, and the automatic shutdown of the pipeline system safety protection at high pressure, and to ensure the stable value of the output pressure. Especially the self-operated pilot flow control valve can realize the effective action and adjustment control of the process parameters only by t...

AI Technical Summary

Problems solved by technology

However, in the existing technology, the hydraulic control element of the self-operated pilot flow control valve is assembled by multiple single-piece pipe connections, the coordination between action control and adjustment control is poor, and the quality and reducibility of single-piece replacement cannot be guaranteed. difficult process

The layout of hydraulic components and pipe joints on the surface of the valve body is complex and inconvenient to install

The spool in the main valve is driven by a diaphragm. The diaphragm has a limited service life under pressure, and the pressure resistance is not high, so it can only adapt to low pressure.

Moreover, it does not have automatic shutdown under low pressure, lacks the check function in the oil production system, and lacks the fire barrier function in the oil delivery system of the oil depot.

The control valve has a short service life and is replaced frequently

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