Low pressure nitrogen supply regulating valve

Overview of Low Pressure Nitrogen Supply Control Valve

The nitrogen sealing device is mainly used for constant control of nitrogen pressure at the top of the storage tank to protect the materials inside the tank from nitriding and ensure the safety of the tank. The nitrogen sealing device consists of two main parts: ZZDQ quick release valve and ZZV micro pressure regulating valve. The quick release valve consists of a pressure controller and a ZMQ-16K single seat shut-off valve.

When the pressure inside the storage tank rises to the set pressure, the quick release valve quickly opens to release excess pressure inside the tank. When the pressure inside the storage tank decreases, the micro pressure regulating valve opens and fills the tank with nitrogen gas. As the micro pressure regulating valve must be used at a pressure below 0.1Mpa and the on-site pressure is high, ZZYP type pressure regulating valve must be installed to reduce the pressure to below 0.1Mpa before it can be used. The nominal pressure is 0.1Mpa, and the pressure can be set in sections from 0.5Kpa to below 66Kpa. The medium temperature is ≤ 80 ℃.

Characteristics of nitrogen sealing device products

The nitrogen sealing device is convenient for setting the supply (discharge) nitrogen pressure and can be operated under continuous production conditions;

The nitrogen pressure setting range is wide, ranging from as low as 0.5Kpa (50mm. w. c) to as high as Kpa, with a ratio of 132 times. The effective area of the pressure detection diaphragm is large, the set spring stiffness is small, and the action is extremely sensitive.

Adjustment of low pressure nitrogen supply regulating valve:

Nitrogen supply pressure adjustment: Select a set value within the pressure adjustment range of ZZV type micro pressure regulating valve, such as 1Kpa (100mm. w. c), and adjust screw 2 to change the pre compression (tension) amount of spring 3 to achieve it;

Nitrogen release pressure adjustment: In the pressure controller section of the ZZDQ quick release valve, adjust seat 3 to change the pre compression amount of spring 4. Generally, to avoid frequent opening and closing of nitrogen sealing devices, the nitrogen release setting value should be far away from the nitrogen supply pressure value, such as 2Kpa (200mm. w. c);

Adjustment of high set value of breathing valve: After adjusting the above two set values, in order to avoid frequent opening and closing of the breathing valve, the set value of the breathing valve should be greater than the pressure relief set value.

The nitrogen sealing valve device is a type of self regulating valve. There are many types of self regulating valves depending on the application medium, including air, nitrogen, steam, and liquid. A breathing valve is usually installed on the top of the storage tank. When the toxic medium storage tank reaches a stable liquid level, the pressure on the top of the tank is equal to the vapor pressure of the medium at that temperature. When the breathing valve exhales, the toxic medium will be discharged outside the tank, which can easily cause personnel poisoning. In order to avoid the volatilization of toxic medium, a certain pressure needs to be maintained on the top of the tank to prevent the toxic medium from evaporating and then being emptied. Nitrogen gas is generally used to maintain this pressure, which is called nitrogen sealing.

The nitrogen sealing valve and nitrogen sealing device produced by the valve are independently developed and researched self operated micro pressure control systems. They are only used to maintain a constant pressure of the protective gas (usually nitrogen) at the top of the container, to avoid direct contact between the materials inside the container and air, prevent material volatilization, oxidation, and ensure the safety of the container. Specially suitable for gas seal protection systems of various large storage tanks. This product has the characteristics of energy saving, sensitive action, reliable operation, and convenient operation and maintenance. Widely used in industries such as petroleum and chemical.

Characteristics of low-pressure nitrogen supply regulating valve:

1. Without the need for external energy, it can work in situations without electricity or gas, which is both convenient and energy-saving, reducing costs

2. The nitrogen sealing device is easy to set for nitrogen supply and release pressure, and can be operated under continuous production conditions

3. The effective area of the pressure detection diaphragm is large, the set spring stiffness is small, the action is sensitive, and the device works smoothly

4. Adopting a non packing design, the valve stem experiences low friction, responds quickly, and has high control accuracy

5. The nitrogen supply device is operated by a commander, with a pressure reduction ratio of up to 100:1, good pressure reduction effect, and high control accuracy

The nitrogen sealing valve device consists of two parts: a nitrogen supply device and a nitrogen release device. The nitrogen supply device consists of a commander and a main valve; The nitrogen release device consists of a pressure open micro pressure regulating valve with internal feedback. The nitrogen pressure is generally set at 100mm per day, and is precisely controlled through a nitrogen sealing device. When the inlet valve of the storage tank is opened When adding materials to the tank, the liquid level rises, the volume of the gas phase decreases, and the pressure increases. When the pressure inside the tank rises above the set pressure of the nitrogen release device, the nitrogen release device opens and releases nitrogen gas to the outside, causing the pressure inside the tank to decrease. When it reaches the set pressure of the nitrogen release device, the nitrogen release device automatically closes. When the outlet valve of the storage tank is opened and the user releases the material, the liquid level drops, the volume of the gas phase increases, and the pressure inside the tank decreases. The nitrogen supply device opens and injects nitrogen into the storage tank to increase the pressure inside the tank. When the pressure inside the tank rises to the point where the nitrogen supply device automatically closes.

The nitrogen sealing valve device is mainly used for constant control of nitrogen pressure at the top of the storage tank to protect the materials inside the tank from nitriding and ensure the safety of the storage tank. The nitrogen sealing valve device consists of two main parts: a quick release valve and a micro pressure regulating valve. The quick release valve consists of a pressure controller and a single seat shut-off valve.

When the pressure inside the storage tank rises to the set pressure, the quick release valve quickly opens to release excess pressure inside the tank. When the pressure inside the storage tank decreases, the micro pressure regulating valve opens and fills the tank with nitrogen gas. As the micro pressure regulating valve must be used at a pressure below 0.1Mpa, and the on-site pressure is high, a pressure regulating valve must be installed to reduce the pressure to below 0.1Mpa before it can be used. The nominal pressure is 0.1Mpa, and the pressure can be set in sections from 0.5Kpa to below 66Kpa, with a medium temperature of 180 ℃.

The nitrogen pressure setting of the nitrogen sealing valve device is convenient and can be carried out under continuous production conditions; The nitrogen pressure setting range is wide, ranging from as low as 0.5Kpa (50mm. w. c) to as high as Kpa, with a ratio of 132 times. The effective area of the pressure detection diaphragm is large, the set spring stiffness is small, and the action is extremely sensitive.

Nitrogen supply pressure adjustment: Select a set value such as 1Kpa (100mm. w. c) within the pressure adjustment range of the micro pressure regulating valve, and adjust screw 2 to change the pre compression (tension) amount of spring 3 to achieve it;

Nitrogen release pressure adjustment: In the pressure controller section of the quick release valve, adjust seat 3 to change the pre compression amount of spring 4. To avoid frequent opening and closing of the nitrogen sealing device, the nitrogen release setting value should be far away from the nitrogen supply pressure value, such as 2Kpa (200mm. w. c). Adjust the high setting value of the breathing valve: After adjusting the above two settings, to avoid frequent opening and closing of the breathing valve, the breathing valve setting value should be greater than the pressure release setting value.

Sanjing Valve Co., Ltd. specializes in the production of electrical regulating valves, self operated pressure regulating valves, and nitrogen sealing devices. These products are widely used in various fields such as petroleum, chemical, power, metallurgy, military, shipbuilding, light industry, papermaking, printing and dyeing, pharmaceuticals, and environmental engineering. three

Low pressure nitrogen supply regulating valve component materials

Main technical parameters of low-pressure nitrogen supply regulating valve

Specification and weight of nitrogen sealing device

Specification of flange for nitrogen sealing device