Production of Self operated Nitrogen Encapsulation Valve Regulating Valve

The nitrogen sealed valve does not require external energy and utilizes the pressure changes of the regulated medium to achieve automatic regulation, keeping the pressure behind the valve constant. The whole machine has sensitive action, small pressure fluctuations in control, and energy savings.

ZZYVP-16BSelf operated nitrogen encapsulation valveIt is a regulating valve that controls the pressure behind the valve. The initial position of the valve core is in the open position. When the controller detects that the pressure behind the valve has increased by a certain value, it automatically closes the controller. Subsequently, the opening of the main valve gradually decreases, and the pressure stabilizes at the required set value.

Structure and principle

Product Features:

1 ZZYVP-16BSelf operated nitrogen encapsulation valveBy using the method of separating the power source and signal points for detection, and adding an adjustable flow device, the adjustment accuracy of the entire valve is greatly improved, and the pressure reduction ratio can reach 2000:1.

2. Widely used in various automatic control scenarios for gas pressure reduction and stabilization, it is particularly suitable as a nitrogen supply valve for nitrogen sealing, with characteristics such as small continuous nitrogen supply pressure fluctuations and sensitive response.

Introduction to common materials for self operated nitrogen seal valve components:

1. Gasket: stainless steel+flexible graphite

2. Diaphragm: Rubber

3. Spring: 60Si2Mn

4、 阀杆： 1Cr18Ni0Ti、304、316、316L、304+F46

5. Pressure conduit: stainless steel, copper

6、 阀体、阀盖： ZG230-450、ZG1Cr18Ni9、WCB、CF8、CF8M、CF3M、CF8+F46

7. Valve core and seat: 1Cr18Ni0Ti, 304, 316, 316L, 304+F46

8. Balanced corrugated pipe: 1Cr18Ni0Ti

Main parameters and performance indicators

Pressure regulation range

Strength and testing of self operated nitrogen sealing valve body:

Before the experiment, the oil stains, water stains, and impurities inside the valve chamber must be cleaned up. Pressure plates should be installed at both ends of the valve body and at the joint to block it. Pressure pumps, pressure gauges, globe valves, and exhaust valves should also be installed. Punch tap water into the valve chamber and maintain pressure. The pressure level is determined according to the valve technical requirements and valve testing standards, with a holding time of 10 minutes. Focus on inspecting the pressure bearing surface and welds of the valve body. If there is external leakage or structural damage, it can be considered qualified.

1. Single unit sealing test:

The test medium is liquid: Before the test, fully open the valve and clean the water stains, impurities, and oil stains in its chamber,After closing the valve, install the pressure plate, pressure pump, pressure gauge, globe valve, exhaust valve, etc. Fill the valve with tap water from the inlet blind plate, and the water pressure level is determined according to the valve technical requirements and valve testing standards, with a holding time of 3 minutes. The leakage rate meets the relevant provisions of the industry standard (GB/T4213-2008) and can be considered qualified.

The test medium is gas: Before the test, fully open the valve and clean the water stains, impurities, and oil stains in its chamber,After closing the valve, install the pressure plate, pressure pump, pressure gauge, globe valve, exhaust valve, etc. Fill the valve with clean air at a temperature of 5-10 ℃ from the inlet blind plate, and the pressure level is determined according to the valve technical requirements and valve testing standards, with a holding time of 3 minutes. The leakage rate meets the relevant provisions of the industry standard (GB/T4213-2008) and can be considered qualified.

2. Action test:

Empty load action test: Before the test, fully open the valve and clean the water stains, impurities, and oil stains in its chamber,Close the valve; If the external hydraulic driven valve can be opened and closed several times, and the valve can operate normally during the opening process, the full stroke time meets the requirements, and there are no abnormal noises or other phenomena, it is considered qualified.

Load opening test: Before the test, fully open the valve to clean the water stains, impurities, and oil stains inside its chamber,Close the valve; Install a test blind plate on one end of the valve body and install a pressure pump, pressure gauge, globe valve, etc. Fill the sealed chamber with clean air pressure, with the pressure level determined according to the valve technical requirements and valve testing standards, for one minute. If the external hydraulic station drives the valve to open and close multiple times, and the valve can operate normally during the opening process, the full stroke time meets the requirements, and there are no abnormal noises or other phenomena, it is considered qualified.

In short, newly purchased regulating valves must undergo strength testing, sealing testing, and action testing, and pass acceptance before they can be put into use.

ZZYVP-16B DN25 self operated nitrogen seal valve

ZZYVP-16B DN25 self operated nitrogen seal valve