Pressure regulating valve

Abstract

The invention provides a pressure regulating valve which comprises a valve body, a fluid flow channel, a cylindrical flow guide screen sleeve, a piston and a piston driving mechanism, wherein the cylindrical flow guide screen sleeve is arranged in the fluid flow channel. A plurality of through holes are formed in a through-flow portion of the flow guide screen sleeve and axially extend along the flow guide screen sleeve, fluid flowing from an inlet of the pressure regulating valve flows to a downstream side through the through holes and flows out of the valve body through an outlet of the pressure regulating valve, the piston driving mechanism is used for driving the piston to axially move along the valve body, the piston can axially move along the flow guide screen sleeve, so that the piston is jointed with the inner wall of the flow guide screen sleeve, the piston axially moves along the valve body under the driving action of the piston driving mechanism, the jointed position of the piston and the inner wall of the flow guide screen sleeve is controlled, the area of the through holes for flowing of the fluid in the flow guide screen sleeve is controlled, and pressure is regulated. On the premise of wide pressure regulating range, the pressure regulating valve is small in size, simple in structure and high in accuracy, and the influence of the driving mechanism on flow of the pressure regulating valve is minimized.

Description

technical field [0001] The invention relates to a pressure regulating valve for a gas supply system, the pressure regulating valve includes a piston for regulating flow, and in particular the invention relates to a piston driving mechanism used in the pressure regulating valve. Background technique [0002] In the gas supply system, the pressure regulating valve is used to adjust the pressure of the medium and high pressure pipeline network of pipeline gas to enter the low pressure user. For example, the pressure of pipeline gas pipelines is usually medium pressure (0.2-0.4MPa), high pressure (2.5-4MPa) or sub-high pressure (0.8-1.6Mpa). For the pressure regulating valve used in the pipeline gas pipeline network, it is expected that the pressure regulating valve has a large flow capacity and a wide pressure regulating range, so that the main gas transmission pipeline network can expand the gas supply range and reduce the number of urban pressure regulating stations. ,Improv...

AI Technical Summary

Problems solved by technology

[0004] In the gas flow path of the regulating valve, the gas has two sections of 90° turning. This kind of structure itself makes this type of pressure regulating valve have the disadvantages of narrow pressure regulating range and small flow capacity.

In addition, because the butterfly valve adopts the principle of slit throttling and pressure regulation, on the one hand, the outlet gas pressure is greatly affected by the inlet gas pressure fluctuations, and the pressure regulation accuracy is poor; device

Images