A Negative Pressure Regulating Valve with New Spool Structure

Abstract

The invention provides a negative pressure adjusting valve of a novel valve element structure. The negative pressure adjusting valve of the novel valve element structure comprises a valve seat, a mainbody, an upper cover, an outer shade, a rotary knob, an adjusting screw, a valve rod, a diaphragm baffle, a diaphragm press plate, a rubber diaphragm, a pressure adjusting spring and a spring. The side face of the middle portion of the valve rod is provided with external threads. The lower side of the external threads are provided with an annular platform. The side face of the bottom of the valverod is provided with a fourth groove. A balance hole is arranged in the valve rod in the length direction of the valve rod and penetrates through the valve rod. During installation, the lower end ofthe valve rod penetrates through a bottom opening of the main body and extends into the valve seat, the upper end of the valve rod extends into a blind hole of the adjusting screw, and a balance cavity is formed between the upper end of the valve rod and the bottom of the blind hole. The diaphragm press plate, the rubber diaphragm and the diaphragm baffle are sequentially arranged in the middle ofthe valve rod in a sleeving manner. The annular platform limits downward movement of the diaphragm baffle. A nut is connected with the external thread on the valve rod in a threaded manner and used for clamping and fixing the diaphragm press plate, the rubber diaphragm and the diaphragm baffle. By the adoption of the negative pressure adjusting valve of the novel valve element structure, the pressure difference between the upper side and the lower side of the valve rod is zero, and control over the output pressure is more accurate.

Description

technical field [0001] The invention relates to a negative pressure regulating valve, in particular to a negative pressure regulating valve with a new valve core structure. Background technique [0002] In the field of medical clinical treatment, the currently commonly used method of sewage or body fluid removal is the method of negative pressure suction. Negative pressure suction devices are widely used as supporting equipment for medical center suction systems, especially in operating rooms, emergency rooms and ICUs. necessary. The negative pressure suction device will set and stabilize the negative pressure source in the central suction system introduced through the negative pressure gas terminal to the negative pressure value required by medical clinics. It is usually used for clinical liquid and dirt suction after forming a suction system with a waste liquid bottle use. Due to the particularity of the application field and use requirements of the negative pressure suc...

AI Technical Summary

Problems solved by technology

At the same time affect the outlet pressure P 2 The change is also the valve port area A 1 and diaphragm area A 2 , limited by the processing technology, the valve port area A 1 It cannot be made too small, limited by the size and cost, the diaphragm area A 2 Can't do too much

Images