Stepless pressure reducing valve

Abstract

The invention relates to a stepless pressure reducing valve. A valve base is arranged in a valve body, a piston in clearance fit with the valve base is installed in the valve base, a guide sleeve is connected to the valve body, the lower end of the guide sleeve is connected with an end cover, the lower end of the piston stretches into the guide sleeve, and an ejector rod in threaded fit with the end cover penetrates through the end cover; a spring is installed in the guide sleeve, the lower end of the spring is supported by the upper end of the ejector rod, and the upper end of the spring is close to the lower end of the piston. When the stepless pressure reducing valve is used in a water supply system and the spring is in a non-compressed state, the pressure reducing ratio is a fixed value; after the two ends of the spring are pressed by rotating the ejector rod, the ejector rod continues to be rotated, the pressure, on the piston, by the spring is gradually increased, water pressure on a water outlet of the stepless pressure reducing valve will be increased gradually, and namely the pressure reducing ratio will be gradually reduced along with gradual increase of the compression degree of the spring. Therefore, the pressure reducing ratio can be adjusted steplessly by adjusting the ejector rod.

Description

technical field [0001] The present invention relates to pressure reducing valves for use in water supply systems. Background technique [0002] The existing structure of a pressure reducing valve used in a water supply system mainly includes: a piston is arranged in the valve body, and the piston is in clearance fit with the valve seat inside the valve body. This kind of pressure reducing valve realizes decompression in a certain proportion by the pressure area difference of the piston itself. Its shortcoming is that each pressure reducing valve can only realize decompression according to a certain ratio, while in the water supply system , often requires multi-stage decompression. To achieve multi-stage decompression using the above-mentioned pressure reducing valve, it is necessary to use a combination of multiple pressure reducing valves. Therefore, one increases the cost of use, and the other increases the complexity of installation and use. Contents of the invention ...

AI Technical Summary

Problems solved by technology

This kind of pressure reducing valve realizes decompression in a certain proportion by the pressure area difference of the piston itself. Its shortcoming is that each pressure reducing valve can only realize decompression according to a certain ratio, while in the water supply system , often requires multi-stage decompression. In order to achieve multi-stage decompression using the above-mentioned pressure reducing valve, it is necessary to use a combination of multiple pressure reducing valves. Therefore, one increases the cost of use, and the other increases the complexity of installation and use.

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