Adjustable high-flexibility low-pressure and stable-pressure pressure reducing valve

Abstract

The invention discloses an adjustable high-flexibility low-pressure and stable-pressure pressure reducing valve, which comprises a valve body and a valve core component, wherein the valve body is provided with an inlet and an outlet; the valve core component is arranged in the valve body; a medium passage for communicating the inlet with the outlet is formed in the valve body; a throttling port is formed in the medium passage; the valve core component corresponds to the throttling port and is used for changing the medium pressure in front of and behind the throttling port; the valve core component comprises a valve core rack, a valve rod and a valve flap; the valve core rack is fixedly arranged in the valve body; the valve rod is arranged in the valve core rack; the valve flap is arranged at the lower end of the valve rod to change the flow rate of the medium passage; a sealing device is arranged between the valve rod and the valve core rack to isolate the upper part of the valve core rack from the lower part of the valve core rack; a pressure chamber in front of the valve is formed between the lower part of the valve core rack and the sealing device; the upper end of the valve core rack has a thin film structure, and a pressure chamber after the valve is formed between the upper end of the valve core rack and the upper part of the valve core rack; and a pressure adjusting structure is also arranged above the thin film structure. The valve has a simple and rational structure, is convenient to manufacture and mount, has high flexibility in pressure adjustment and has certain pressure stability, and the pressure adjustment range is adjustable.

Description

technical field [0001] The invention relates to a valve, especially a pressure reducing valve. Background technique [0002] The pressure reducing valve in the prior art basically has two principles: the first one is to let the medium from the inlet flow through the valve core of the main valve and the valve cone of the pilot valve to open the main valve port under the main valve core through the pressure of the spring. The pressure is adjusted in a way to stabilize the pressure by the size of the opening; the second is to allow the high-pressure medium to flow into the inlet of the valve body with the piston, diaphragm and main and auxiliary valve discs, and the pressure is formed by the different areas of the media acting on these parts. The balance relationship between the pressure difference and the spring force adjusts the size of the disc opening to adjust the pressure. [0003] The utility model patent with the patent number CN201020300767.3 discloses a pressure redu...

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Problems solved by technology

[0008] The problem to be solved by the present invention is to provide an adjustable high-sensitivity low-pressure stabilized pressure reducing valve, which has a simple and reasonable structure, and is convenient to manufacture and install. According to the second pressure reducing valve principle, the pressure adjustment range can be adjusted. It can quickly and automatically adjust the balance relationship, and has high sensitivity of pressure adjustment. When the inlet pressure is low, the outlet pressure and flow fluctuate within the allowable range, and it has certain pressure stability.

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