Self-operated differential pressure control valve

Abstract

The invention discloses a self-operated differential pressure control valve for fluid medium control. The self-operated differential pressure control valve is composed of a valve body, a valve cover,a spring cylinder, an exhaust screw, an opening and closing mechanism, a balance device, a differential pressure adjusting device and a pressure guide device, wherein the valve body, the valve cover and the spring cylinder form a shell portion of the differential pressure valve, the opening and closing mechanism comprises a pressure sensing element, a main spring and a valve plug, and is arrangedin the valve body, the pressure sensing element and the valve cover form a pressure sensing element cavity, the balance device comprises two balance springs, a circlip for a hole and a floater, and isarranged in the valve plug, the differential pressure adjusting device is composed of a pressure regulating valve body, a pressure regulating valve rod, a sealing gasket and a display panel, and is tightly pressed on the valve cover through screws, and the pressure guide device comprises a copper ball valve, a pressure guide pipe seat, a pressure guide pipe, a sleeve, an O-shaped ring and a locknut, and is also installed on the valve cover.

Description

technical field [0001] The present invention relates to the technical field of fluid control valves, in particular to a self-operated differential pressure control valve (hereinafter referred to as differential pressure valve) for fluid medium control. Background technique [0002] Most of the differential pressure valves at home and abroad use diaphragms and springs as the opening and closing mechanism in the prior art to drive the valve plug (spool) to change the flow area between it and the valve seat hole, so that the pressure at the water inlet of the differential pressure valve and the distance between the water supply pipe The pressure difference between them is a fixed value, which is called the control pressure difference in the industry. JG / T383-2012 "Self-operated pressure difference control valve for heating and air conditioning" stipulates that the control pressure difference error should be ≤ 8%, which is difficult for many enterprises to achieve. [0003] 1. I...

AI Technical Summary

Problems solved by technology

[0014] The present invention provides a self-operated differential pressure control valve (hereinafter referred to as: differential pressure valve) for fluid medium control to solve the existing problems in the prior art, such as large control differential pressure error, stuck automatic valve plug, and unsupported system active change. The function of the flow rate, gas storage in the cavity of the pressure sensing element, the seal between the pressure guiding tube and the pressure guiding tube seat is easy to break, the range of the control pressure difference is small, and there are no technical problems in controlling the display value of the pressure difference

Images