Breathing valve according to the national standard (GB50160-90) of the regulations, "A, B liquid fixed roof tank, the application of flame arrester and breathing valve." Visible breathing valve, flame arrester is an indispensable storage tank safety facilities. The breather valve not only maintains the pressure balance of the tank, but also ensures that the rabbit is destroyed when the tank is overpressured or under vacuum, and reduces the volatilization and loss of the medium in the tank to meet the ventilation requirements for the size of the tank. Breathing valve, with a compact, large ventilation, leakage is small, good sealing performance. Breathing valve is to protect the safety of the tank an important annex, installed in the roof of the tank, the pressure valve and vacuum valve composed of two parts. Its role in the general case, to maintain the airtight tank, to some extent, reduce the evaporation loss of oil. When necessary, it can automatically regulate the pressure inside and outside the tank to play a safety role. When the oil and gas pressure in the tank is greater than the allowable pressure of the oil tank, the oil vapor escapes through the pressure valve and the vacuum valve is closed at this time. When the oil and gas pressure in the tank is less than the allowable vacuum of the oil tank, fresh air enters the tank through the vacuum valve, The pressure valve is now closed, allowing pressure (or vacuum pressure) to be controlled by the weight of the dial. LTHF-5-type takeover Breathing Valve Features and Performance: Takeover Breathing valve is installed on the fixed roof cans on the ventilation device, play a role in reducing evaporation loss of oil to control the pressure on the tank and prevent the introduction of outside flame. The breathing valve with ventilation, leakage, corrosion resistance and other characteristics, and electrostatic grounding line, so that the valve and tank to maintain equipotential. Cryogenic breathing valve for cryogenic storage tank developed special equipment. It requires no energy, is easy to use, safe and reliable, provides accurate low pressure and vacuum protection for low temperature storage, brings great convenience to low temperature storage in the petrochemical industry, and fills the gap in this respect in China. At the same time on the safety of fire and environmental protection has a very important significance. Explosion-proof fire breathing valve is set flame arrester and breathing valve as a whole, with a large ventilation, sealing performance, leakage, corrosion resistance and other characteristics. It is a necessary new type of petrochemical storage tank safety equipment, its greatest advantage is fire breathing resistance, light weight, easy maintenance. This product is suitable for Class A oils with a flash point below 28 ℃ and Group B oils with a flash point below 60 ℃. Such as gasoline, kerosene, diesel, crude oil, benzene, toluene, ethanol and other media storage tank, it -35 ℃ - +60 ℃ temperature environment work properly. LTHF-3 all-weather fire-resisting breathing valve is a new type of petrochemical storage tank safety equipment, its greatest advantage is good resistance to fire breathing performance, light weight, good sealing performance, small leakage, corrosion-resistant maintenance easy. This product is suitable for storage of Class A oil with a flash point below 28 ℃ and Group B oil with a flash point below 60 ℃. It is used in media tanks such as gasoline, kerosene, diesel oil, crude oil, toluene and ethanol. 35 ℃ ~ 60 ℃ temperature environment in normal work. LTHF-2 all-weather breathing valve for the valve seat overlapping the gravity structure. The utility model is characterized in that the soft contact between the valve disc and the valve seat with an air cushion is used, which is air-tight and is not easily frosted and frozen, and is suitable for use in a cold area. The all-weather breathing valve is used to install the main safety equipment on fixed roof storage tanks such as crude oil, gasoline, kerosene, light diesel oil and aromatic hydrocarbon. It functions as evaporation loss and protects the storage tank against overpressure or vacuum. This valve is usually used with flame arrester. The valve has a large amount of ventilation, sealing performance, leakage, corrosion resistance and other characteristics. LTHF-1 vacuum vent pressure relief valve is mounted on the tank negative pressure ventilation device, can be used in conjunction with the breathing valve, used to increase the tank air intake to prevent tank deflated, can also be used alone. The use of breathing valve Breathing valve installed in the top of the tank, is to solve the tank of positive pressure, negative pressure of gas, so that the liquid inside the tank is not hindered access, when the external liquid into the tank when a large number of gas outbound call Pressure). If the tank liquid output when the tank must be drawn into the tank from the outside air (called negative pressure). Stop breathing when the valve is automatically closed will not leak the liquid gas tank, so that the liquid inside the tank has been a good guarantee. In order to breathe the valve to be safe to use, check whether the guide rod and valve plate are flexible before using. Breathing valve to be checked regularly 6 months 1, check the pressure valve plate and vacuum valve plate is flexible, guide valve ring contact with or without damage. 2, re-install the pressure valve plate, to ensure that the contact surface should be tight, flexible guide rod movements. 3, the opening of the new breathing valve, you must clear the shock between the valve. After maintenance, everything is normal and can be reused. Breathing valve uses and instructions Breathing valve for all types of vertical tank for respiration for the size can be installed in the tank top or pipe. Working range: Positive pressure of 100mmH2O, negative pressure of 30mmH2O. Positive pressure can be used to adjust the weight, negative pressure adjustable vacuum springs. Breathing valve can be directly mounted on the top of the ground tank and semi-underground tank, installed in the semi-underground tank, the outlet elbow leads to the ground, the canister can be installed in the ventilation pipe. Breathing valve technical requirements: positive pressure valve plate and vacuum valve plate, seal the contact surface to be smooth, tight, without any defects. Each valve disc and the pressure weight error does not exceed ± 20 grams. Seal sealing surface should be perpendicular to the centerline of the guide rod, the basket should not be straightness greater than 0.08mm. With the roundness of the valve disc and its centerline of the guide rod of different concentricity of not more than 0.05mm. Valve plate in the guide rod can move freely, there should be no tilt and jamming phenomenon. Products before the positive pressure, negative pressure should be tight test, after passing the factory.
