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The nitrogen sealing valve and nitrogen sealing device produced by the valve is a self-developed and developed self-operated micro-pressure control system. Only the pressure used to maintain the protective gas (usually nitrogen) at the top of the vessel is constant, so as to avoid direct contact of the material in the vessel with air. To prevent the material from evaporating, being oxidized, and the safety of the container. It is especially suitable for gas seal protection systems of various large-scale storage tanks. The product has the characteristics of energy saving, sensitive movement, reliable operation and convenient operation and maintenance. Widely used in petroleum, chemical and other industries.
The characteristics of the nitrogen sealing valve and nitrogen sealing device produced by the valve:
1. Without external energy, it can work in no-electricity, no-gas, convenient, energy saving, and cost-saving.
2. The pressure of the nitrogen-sealing device for supplying nitrogen and nitrogen is conveniently set and can be carried out under continuous production conditions.
3, pressure detection diaphragm effective area, set the spring stiffness is small, the action is sensitive, the device works smoothly.
4. With no packing design, the valve stem is subject to low friction, rapid response and high control accuracy.
5, the nitrogen supply device uses pilot operation, pressure reduction ratio up to 100:1, decompression effect is good, high control accuracy.
The nitrogen seal valve device consists of a nitrogen supply device and a nitrogen release device. The nitrogen supply device is composed of a pilot and a main valve; the nitrogen release device is composed of a pressure-opening type micro-pressure regulating valve with internal feedback. The nitrogen pressure is generally set to 100mm on day 20 and precisely controlled by a nitrogen seal.
When the inlet valve of the tank is opened, when the material is added into the tank, the liquid level rises, the volume of the gas phase part decreases, and the pressure rises. When the pressure in the tank rises above the pressure set value of the nitrogen discharge device, the nitrogen release device opens. When nitrogen is released to the outside world and the pressure in the tank falls, the nitrogen release device automatically shuts off when it reaches the pressure set point of the nitrogen release device.
When the tank outlet valve opens, when the user discharges the material, the liquid level drops, the volume of the gas phase increases, the pressure in the tank decreases, the nitrogen supply device opens, nitrogen is injected into the storage tank, the pressure in the tank rises, and the pressure in the tank rises. Until the nitrogen supply device shuts off automatically.
The nitrogen sealing valve device is mainly used for the constant control of the nitrogen pressure at the top of the storage tank to protect the material in the tank from being nitridated and the storage tank safe. The nitrogen sealing valve device consists of two parts, the fast relief valve and the micro pressure regulating valve. The rapid relief valve consists of a pressure controller and a single seat shut-off valve.
When the pressure in the tank rises to the set pressure, the quick relief valve opens quickly and the excess pressure in the tank is released. When the pressure in the tank decreases, the micro-pressure control valve opens the valve and fills the tank with nitrogen. Because the micro pressure regulating valve must be used under the pressure of 0.1Mpa and the on-site pressure is high, the pressure regulating valve must be installed to reduce the pressure of the pressure regulating valve to 0.1Mpa or less. Nominal pressure 0.1Mpa, pressure can be set in sections, from 0.5Kpa to 66Kpa below, medium temperature temperature l80 °C.
The nitrogen pressure of the nitrogen sealing valve device is convenient to set and can be performed under continuous production conditions; the nitrogen pressure can be set in a wide range, as low as 0.5Kpa (50mm.wc), as high as Kpa, and the ratio is 132 times. The pressure detection diaphragm has a large effective area, set the spring stiffness is small, and the action is extremely sensitive.
Nitrogen supply pressure adjustment: select a set value such as 1Kpa (100mm.wc) within the pressure adjustment range of the micropressure regulator valve, and adjust the adjustment screw 2 to change the precompression (stretch) amount of the spring 3 to achieve;
Nitrogen pressure adjustment: In the pressure controller part of the fast relief valve, by adjusting the seat 3, the pre-compression amount of the spring 4 is changed. Generally, in order to avoid frequent opening and closing of the nitrogen sealing device, the nitrogen setting value should be kept away from the nitrogen supply pressure value, such as 2Kpa (200mm.wc), and the breathing valve high setting value adjustment: after the above two setting values ​​are adjusted, in order to avoid breathing Frequent valve opening and closing, the breathing valve setting should be greater than the pressure relief setting.
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 petroleum, chemical, power, metallurgy, military, shipbuilding, light industry, papermaking, printing and dyeing, pharmaceuticals, and environmental protection projects. And many other fields. Three fine valves welcome you to buy
Nitrogen sealing valve device composition and production characteristics
The nitrogen sealing valve device is a kind of self-operated regulating valve. There are many kinds of self-operated regulating valve, depending on the application medium, with air, nitrogen, steam, and liquid. The top of the tank will generally be equipped with a breathing valve. When the toxic medium storage tank reaches a stable liquid level, the pressure at the tank top is equal to the vapor pressure of the medium at that temperature. When the breathing valve is exhaled, the toxic medium will drain out of the tank, causing poisoning of personnel and avoiding toxic solvent evaporation. It is necessary to maintain a certain pressure on the liquid surface of the tank to prevent the toxic medium from evaporating and then emptying. Nitrogen is generally used to maintain this pressure. This is called a nitrogen seal.