Double-pressure control proportional valve and control method

Abstract

The invention relates to a double-pressure control proportional valve. The double-pressure control proportional valve comprises a main valve body, a main proportional valve and a servo proportional valve; the main proportional valve comprises a main proportional valve body provided with a spacing ring whose upper end communicates with a main intake way, a main proportional valve element inserted in the spacing ring and provided with a main proportional stopper opposite to the upper end of the spacing ring by the upper end, a pressure spring base connected with the lower end of the main proportional valve element, a main proportional leather film provided with a support plate opposite to the lower end of the pressure spring base and connected with the side periphery of the main proportionalvalve body by the outer edge, and a main proportional pressure spring whose two ends are correspondingly pressed at the lower end of the spacing ring and the upper end of the pressure spring base oneto one; a side hole communicating with the main exhaust way is formed in the side periphery of the spacing ring; the main valve body is provided with a servo intake way communicating with the main intake way by one end, and an exhaust way whose one end is positioned on the lower side of the main proportional valve leather film and other end communicates with an outlet of the servo proportional valve; and the other end of the servo intake way communicates with an inlet of the servo proportional valve and the main exhaust way. The double-pressure control proportional valve is flexible in outputpressure adjustment and better in pressure stabilization effect in short-time fluctuation of the gas pressure.

Description

technical field [0001] The invention relates to the field of gas valves, in particular to a dual pressure control proportional valve and a control method. Background technique [0002] The utility model of Chinese patent application number: CN201620201556.1 discloses a gas proportional valve. The gas proportional valve includes: a valve body, a valve core assembly and a drive reset member, wherein a first valve chamber, a second Valve cavity and valve port, the lower end of the valve port is connected to the first valve cavity and the upper end is connected to the second valve cavity, the first valve cavity is connected to the air inlet, and the second valve cavity is connected to the air outlet; the valve core assembly is opened in the up and down direction It is movably arranged on the valve body between the position of closing the valve port. The valve core assembly includes a valve core and a seal. The seal is arranged on the valve core. When the valve core assembly clos...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of the current gas proportional valve, which are not sensitive enough to adjust the output pressure, and the effect of stabilizing the gas pressure is poor when the gas pressure fluctuates for a short time; Dual pressure control proportional valve with better pressure effect and its control method

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