Self operated nitrogen sealing valve

1Self operated nitrogen sealing valveOverview

ZYVP, Shangzhou, HenanSelf operated nitrogen sealing valveComposed of a control valve, actuator, and commander, it is an energy-saving product that does not require external energy and uses the pressure of the regulated medium as a power source to automatically adjust the pressure to a constant level. This valve has high control accuracy, about twice as high as general self regulating valves, and is suitable for situations where high control accuracy is required.ZZYVP pressure regulating valve with controller does not require external energy. It uses the energy of the regulated medium itself as the power source and introduces the controller of the pressure valve to control the position of the pressure valve core, change the flow rate of the medium passing through the valve, and maintain a constant pressure at the back end of the valve. The nominal pressure is 1.0 and 1.6 MPa; Pressure segmented adjustment from 0.5 to 1000Kpa, working temperature at 0100 ℃; Flange standard according to GB9113-88, convex flange. The structural length shall comply with GB12221-89 standard. Nitrogen sealed valves do not require external energy and use the energy of the regulated medium itself as a power source. A pressure stabilizing device that automatically controls the flow rate of the valve medium to maintain a constant pressure behind the valve. It has been widely used in natural gas extraction and transportation for continuous gas supply, urban gas, and industrial production sectors such as metallurgy, petroleum, and chemical industry. The characteristics of this valve are high control accuracy, which can be about twice as high as the general ZZY type direct operated pressure regulating valve. Adjusting the pressure difference ratio (such as 0.8MPa in front of the valve and 0.001MPa behind the valve) is particularly suitable for micro pressure gas control. The pressure setting is implemented on the commander, making it convenient, fast, labor-saving, and time-saving to continuously set during operation,

ZYVP opening and closing

(1) When the nitrogen seal valve is closed, the piston of the main valve is in a sealed chamber. When the tank pressure is equal to or greater than the set pressure, the diaphragm is pushed up, and the pilot valve moves upward under the action of the spring, tightly pressing the sealing ring on the pilot valve against the valve seat, closing the inlet of the control gas. At the same time, the pressure in the special valve core chamber increases and approaches the pressure of the nitrogen main pipe. This pressure is transmitted from the special valve core chamber to the main valve core chamber through an internal channel. The piston of the main valve is under the pressure of the nitrogen manifold. Due to the balance of gas pressure on the upper and lower parts of the main valve core, the main valve core tightly closes the valve under its own weight and the action of the spring.

(2) When the nitrogen seal valve is opened, when the pressure in the storage tank is slightly lower than the set pressure, the diaphragm moves downward due to the decrease in induced pressure, pushing the gas guide valve to open. Nitrogen enters the storage tank through the orifice plate and the outlet of the gas guide valve, increasing the pressure inside the storage tank. At the same time, the pressure in the special valve core chamber of the gas guide valve decreases, and nitrogen enters the main valve core chamber through the internal channel from the special valve core chamber. Due to the fact that the piston area of the main valve core is larger than the area of the main valve seat hole, and there is the elastic force of the spring and the weight of the main valve, when the tank pressure is slightly lower than the set point, the pressure in the special valve core chamber and the main valve core chamber decreases very little, and the main valve still remains closed. Nitrogen only enters the tank from the pilot valve.

(B) Control the pressure behind the valve
(K) Control valve front pressure

2、 Main component materials

阀　体： ZG230～450、ZG1Cr18Ni9Ti、ZGCr18Ni12Mo2Ti
阀　芯： 1Cr18Ni9Ti Cr18Ni12Mo2Ti
阀　座： 1Cr18Ni9Ti Cr18Ni12Mo2Ti
Bellows: 1Cr18Ni9Ti
Membrane cover: A3, 1Cr18Ni9Ti
Diaphragm: Nitrile rubber, oil resistant adhesive, fluororubber

3、 Main technical parameters of ZYVP

4、 External dimensions

Note: The flange distance in this table is based on PN16.