Product features:

Without the need for external energy, it can work in situations without electricity or gas, which is both convenient and energy-saving, reducing costs;
The nitrogen sealing device is easy to set for nitrogen supply and release pressure, and can be operated under continuous production conditions;
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;
Adopting a non packing design, the valve stem experiences low friction, responds quickly, and has high control accuracy;
The nitrogen supply device adopts a commander operation, with a pressure reduction ratio of up to 100:1, good pressure reduction effect, and high control accuracy;
To ensure the safety of the storage tank, a breathing valve should be installed on the top of the tank;
The breathing valve only serves a safety purpose, avoiding the defect of frequent opening and closing and easy damage in conventional nitrogen sealing devices.

summary:
The nitrogen sealing 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 to 100mmH2O Accurate control through nitrogen sealing device.
When the inlet valve of the storage tank is opened and materials are added 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 the pressure drops to the set pressure of the nitrogen release device, the nitrogen release device automatically closes.
When the liquid 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, the pressure inside the tank decreases, and the nitrogen supply device opens to inject nitrogen into the storage tank, causing the pressure inside the tank to rise. When the pressure inside the tank rises to the point where the nitrogen supply device automatically closes.

Working principle of nitrogen supply device
The structure of the nitrogen supply device is shown in the figure on the right. The medium at the pressure point located on the top of the tank is introduced into the detection mechanism (7) through a pressure pipe. The medium generates a force on the detection element that is balanced with the spring (8) and pre tension force. When the pressure inside the tank drops below the set point of the nitrogen supply device, the balance is disrupted, causing the commander valve core (6) to open, allowing the gas in front of the valve to pass through the pressure reducing valve (5), throttle valve (4), and enter the upper and lower membrane chambers of the main valve actuator (3). The main opening valve core (2) is then opened to fill the tank with nitrogen gas; When the pressure inside the tank rises to the set point of the nitrogen supply device, due to the preset spring force, the controller valve core (6) is closed, and due to the spring action in the main valve actuator, the main valve is closed, stopping the nitrogen supply.

Working principle of nitrogen release device
The structure of the nitrogen release device is shown in the right figure. The device adopts an internal feedback structure, and the medium directly enters the detection mechanism (2) through the valve cover. The medium generates a force on the detection element that is balanced with the pre tightening force of the preset spring (3). When the pressure inside the tank rises above the pressure set point of the nitrogen release device, the balance is disrupted, causing the valve core (1) to move upward, open the valve, and release nitrogen gas to the outside; When the pressure inside the tank drops to the set point of the nitrogen release device, the valve is closed due to the preset spring force.

explain
The general nitrogen supply pressure is between 3 × 105-10 × 105Pa;
The breathing valve on the top of the tank only serves a safety purpose and does not work under normal circumstances when the main valve fails, causing the pressure inside the tank to be too high or too low;
The nitrogen release valve is installed on the top of the tank, and its diameter is generally the same as that of the inlet valve;
The pressure setting point of the general nitrogen release valve is slightly higher than that of the nitrogen supply valve to avoid frequent operation of the nitrogen supply and release devices, waste of nitrogen gas, and affecting the service life of the equipment. If there are any discrepancies between the user's working conditions and the design manual, please contact our technical development department by phone for negotiation and resolution.
Main technical parameters and performance indicators
1. Nitrogen supply device

2. Nitrogen release device

Main component materials:
Valve body: ZG230-450, ZG1Cr18Ni9 Valve internal: 1Cr18Ni9Ti
Membrane cover: A3, 1Cr18Ni9Ti Membrane: clip reinforced polyester fabric, nitrile rubber, fluororubber
Spring: 60Si2Mn, 1Cr18Ni9Ti
According to user requirements, other grades of materials can be used for the valve body, valve internals, and diaphragm cover.