Double Piston Axial Flow Control Valve

Abstract

The invention relates to a two-piston type axial flow regulating valve which comprises valve bodies. The valve bodies comprise a right valve body, a left valve body and a middle valve body. The middle valve body is arranged in a valve body shell composed of the right valve body and the left valve body. The middle valve body comprises a valve cage, a valve cylinder, a transmission valve rod, a connecting rod, a bearing, a guide sleeve, a valve seat, a sealing ring and a valve cover. The transmission valve rod is installed in the bearing, one end of the transmission valve rod is fixedly connected with the valve cylinder through the connecting rod, the other end of the transmission valve rod is inserted into the guide sleeve, and the guide sleeve is fixedly inserted into an inner hole of the middle valve body. The sealing ring installed in the valve seat and the valve cage are assembled to be a sealing assembly with which the valve cylinder is sleeved, one end of the assembly is inserted into the middle valve body, and the other end of the assembly is fixedly connected with the left valve body. A grease filling hole channel and a drainage hole channel are formed in the valve bodies, and a grease filling valve and a drainage valve are arranged respectively. The two-piston type axial flow regulating valve is good in stability, long in service life, good in sealing performance, flexible in emergency treatment and convenient to use.

Description

technical field [0001] The invention relates to a double-piston axial flow regulating valve. Background technique [0002] Control valves are mainly used in the oil and gas industry. It is connected with the actuator, by receiving the remote control signal, adjusting the opening of the valve port and other actions to realize the purpose of controlling the process parameters such as the flow rate and pressure of the medium in the transportation, storage and distribution automation system, which belongs to the field of automatic control technology . [0003] Regulatory valve technology is continuously improved in the research and development of axial flow control valves through continuous introduction and innovation, and based on rich experience in implementation. The following describes the technical advantages and disadvantages of the existing axial flow control valves: [0004] The control valve is mainly composed of valve body, sealing sleeve, valve stem, guide sleeve, ...

AI Technical Summary

Problems solved by technology

[0006] Disadvantages: 1. The sealing structure of the valve seat is similar to the grid ring, and the sealing is realized by the pre-compression force of the O-ring. It is suitable for high-pressure sealing with small and medium diameters, but not for high-pressure sealing with large diameters, that is, the high-pressure adaptability is limited; 2. . The driving valve stem transmits the thrust to the transmission valve stem relying on the slope mechanism, but the diameter of the transmission valve stem is small, and at the same time it is a semi-circular structure, the contact area with the guide sleeve is small, and the unit specific pressure is large, which is easy to cause the guide sleeve and the transmission valve stem to be damaged. Wear and tear will cause fluid leakage, that is, the service life is limited; 3. Equipped with breathing cap and oil nozzle, after fluid leakage occurs, it needs to be repaired immediately

If the valve is used in a working condition that requires no maintenance in a short period of time, it cannot meet the requirements, that is, the adaptability of the working condition is limited

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