Nitrogen sealing valve (nitrogen supply/nitrogen release device)

The nitrogen sealing valve (nitrogen supply device
/
nitrogen release device)
is a self-operated micro-pressure control system independently developed and developed by our factory. It is mainly used to maintain the protective gas at the top of the container (usually The pressure of nitrogen (nitrogen) is constant to avoid direct contact between materials in the container and air, prevent materials from volatilizing, being oxidized, and ensuring the safety of the container. This product has the characteristics of energy saving, sensitive action, reliable operation, convenient operation and maintenance. Widely used in petroleum, chemical and other industries. The nitrogen sealing valve consists of two parts: a nitrogen supply valve of a nitrogen supply device and a nitrogen release valve of a nitrogen release device. The nitrogen supply device consists of two parts: the pilot and the main valve. The nitrogen release device consists of a pressure-opening micro-pressure regulating valve with internal feedback. The nitrogen pressure is generally set to . It is accurately controlled by the nitrogen sealing device.
Working principle of nitrogen sealing valve
When the liquid inlet valve of the storage tank is opened and materials are added to the tank, the liquid level rises and the volume of the gas phase part decreases and the pressure rises. When the pressure in the tank rises above the pressure setting of the nitrogen release device When the pressure is set, the nitrogen release device opens and releases nitrogen to the outside world, causing the pressure in the tank to drop to the pressure set point 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 discharges material, the liquid level drops and the volume of the gas phase increases, the pressure in the tank decreases and the nitrogen supply device opens. Nitrogen is injected into the storage tank to increase the pressure in the tank. When the pressure in the tank rises, it reaches the nitrogen supply device. Automatically shuts down.
Working principle of the nitrogen supply device
The structure of the nitrogen supply device is as shown in the figure on the right. The medium at the pressure point on the top of the tank is introduced into the detection mechanism through the pressure guiding pipe. The medium generates a force on the detection element. Balanced with spring and preload force. When the pressure in the tank drops below the pressure set point of the nitrogen supply device, the balance is destroyed, causing the pilot valve core to open, allowing the gas in front of the valve to pass through the pressure reducing valve and throttle valve and enter the upper and lower membrane chambers of the main valve actuator. The main valve spool is opened and nitrogen is filled into the tank. When the pressure in the tank rises to the pressure set point of the nitrogen supply device, the pilot spool is closed due to the preset spring force and the main valve is closed due to the action of the spring in the main valve actuator to stop the supply. nitrogen.
Working principle of the nitrogen release device
The structure of the nitrogen release device is as shown in the figure on the right. The device adopts an internal feedback structure. The medium directly enters the detection mechanism through the valve cover. The medium generates an acting force on the detection element and preset spring preset. Tight force balance. When the pressure in the tank rises above the pressure set point of the nitrogen relief device, the balance is destroyed, causing the valve core to move upward, opening the valve to release nitrogen to the outside world. When the pressure in the tank drops to the pressure set point of the nitrogen relief device, due to the preset spring force Function to close the valve.
Description
The nitrogen supply pressure of the nitrogen sealing valve is generally between ^-^
The breathing valve on the top of the tank only plays a safety role when the main valve fails and the pressure in the tank is too high or too low. Due to the safety function, it does not work under normal circumstances
The diameter of the nitrogen relief valve installed on the top of the tank is generally the same as the diameter of the liquid inlet valve
Generally, the pressure setting point of the nitrogen relief valve is slightly larger than the pressure setting of the nitrogen supply valve Point to avoid frequent operation of the nitrogen supply and release device, which wastes nitrogen and affects the service life of the equipment
If there is any discrepancy between the user's working conditions and the model manual, please call us and contact the technical development department of our factory for negotiation
Main technology of nitrogen sealing valve Parameter
Nitrogen supply device
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% = Quick opening
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% => Nominal pressure
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% => Temperature of the medium to be adjusted (℃)
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% => Allowable leakage level
% = Standard level: Level IV (-) Tight type: Level VI (-)