High-stability self-operated pressure regulating valve

Abstract

The invention discloses a high-stability self-operated pressure regulating valve, and belongs to pressure regulating valves. The high-stability self-operated pressure regulating valve comprises a valve body, the two ends of the valve body are fixedly connected with water pipes through flanges, and a first pressure transmission pipe, a second pressure transmission pipe, a third pressure transmission pipe and a fourth pressure transmission pipe are additionally mounted on the two sides of the valve body and the two sides of the water pipes correspondingly. A valve rod is controlled through a first pressure regulating case and a second pressure regulating case, and the precision that the valve rod shifts according to pressure is improved. Small water stop valves for controlling water flow arearranged on the sides of the first pressure transmission pipe, the second pressure transmission pipe, the third pressure transmission pipe and the fourth pressure transmission pipe, and the pressuredifference in the first pressure regulating case and the second pressure regulating case is controlled conveniently. A pressure regulating mechanism at the top of the second pressure regulating case has the function of directly controlling the valve rod, the alternative scheme is achieved under the situation that the first pressure regulating case and the second pressure regulating case are not serviceable, and the application range of the valve body is widened.

Description

Technical field [0001] The invention relates to the technical field of valves, and more specifically, to a highly stable self-operated pressure regulating valve. Background technique [0002] Regulating valve is also known as control valve. In the field of industrial automation process control, it accepts the control signal output by the adjustment control unit and uses power operation to change the final control element of process parameters such as medium flow, pressure, temperature, and liquid level. Generally composed of actuators and valves. The self-operated pressure regulating valve is divided into three series of self-operated pressure, differential pressure and flow regulating valve. According to the position of the pressure point, it is divided into two types: valve front and valve. When the pressure point is in front of the valve, it is used to adjust the valve front When the pressure is constant, when the pressure point is behind the valve, it is used to adjust the p...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the object of the present invention is to provide a highly stable self-operated pressure regulating valve, which adds a first pressure delivery pipe, a second pressure delivery pipe, a The third pressure delivery pipe and the fourth pressure delivery pipe control the valve stem through the first pressure adjustment box and the second pressure adjustment box, which improves the accuracy of the displacement of the valve stem according to the pressure. The side parts of the pressure delivery pipe, the third pressure delivery pipe and the fourth pressure delivery pipe are provided with small water stop valves to control the water flow, which is convenient to control the pressure difference inside the first pressure regulation box and the second pressure regulation box, and the second pressure regulation box The pressure adjustment mechanism on the top of the pressure adjustment box has the function of directly controlling the valve stem. It has a backup solution when the first pressure adjustment box and the second pressure adjustment box cannot be used, and strengthens the scope of use of the valve body.

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