Pressure relief valve and its main role is to monitor the pressure of cement tank, when the pressure is too large for the tank can bleed through the pressure relief valve to protect cement tank pressure remains in the security line, reducing its Because the cement warehouse roof top dust explosion hazard probability of occurrence. Pressure relief valve is installed: (1) when there is gas in the container, liquid two-phase materials, the valve should not be installed in the gas phase portion. (2) relief valve is mainly used for flammable liquids, should be connected to the outlet valve of the tank accident. When flammable liquid fuel for high temperature, then the receiving container must have protection facilities. (3) you can place the vent valve, but the vent must be one meter higher than the operating personnel, and fire can not occur within fifteen meters. If the vent is installed indoors must lead to the roof and the roof should be higher than about 2 two meters. (4) At the entrance there are some safety valve block valve, it should be kept normally open state, isolation valves should be in a normally open state, and be sealed with lead, to prevent errors. When abnormal pressure endanger silo structure, safety pressure valve is the last line of defense. This is why, when suddenly the pressure is too large or too large pumping pressure inside the silo must be dealt with immediately. Efficient and reliable pressure relief valve silo system is essential equipment. When the pressure value is within the preset range, the coil spring so that the valve cover closed. Three external spring bar so that the external annular bonnet to maintain tight closure until the pressure generated within the silo is less than the spring force. When the pressure is too high or too low in the warehouse when once the pressure exceeds a preset range, the valve cover on the last push to relieve pressure. Smaller valve cover covering the outside of the valve cover from the bottom center of the circular opening. Smaller valve cover by a single spring rod fixed to the outside and covered with pressurized air through a standard valve inside the silo. When the pumping pressure, compressing the spring and fall bonnet. Air from the outside into the silo, then ensure the rapid pressure balance valve cover and push the center of the closed position. The entire work process without manual operation. Widely used in storage material cylinder, top hopper, usually with a warehouse roof dust machine used in conjunction. When working in a certain pressure range of the pressure inside the device, the internal medium acting on the valve on top of the force is less than the load applied to the valve body above the force, the difference between them constitute the sealing force between the valve and valve seat, pressed so that the valve seat with the media, the device can not be discharged. When the pressure inside the device exceeds the pressure of work and reach safety valve opening pressure, the internal role of the media in trouble flap above loading mechanism force is greater than the force exerted on it, and then leave the valve seat and valve open, equipment i.e. within the medium is discharged through the valve seat. Safety valve: valve play a security role in the system. When the system pressure exceeds a predetermined value, the safety valve open Ting, the system part of the gas into the atmosphere, so that the system pressure does not exceed the allowable value, in order to ensure that the system pressure is too high due to an accident does not occur. Also known as a safety valve relief. Several typical structure is illustrated as a safety valve. Figure A is a piston valve, the valve is a flat. Air pressure acting on the piston A, when the pressure exceeds a safe value determined by the spring force, piston A is top open, a portion of the compressed air that is discharged into the atmosphere from the valve port; when the air pressure falls below the safety value, the drive spring piston down, closes the valve port. Technical parameters carbon steel body pressure relief valve, the valve diameter = 273mm maximum air volume 9.000m3 / h maximum preset negative value - 0.002 bar; maximum pressure + 0.05 bar Weight: 9.5 kg lightweight design, reducing the overall size easy handling highly resistant to pressure interference easy installation and maintenance fast processing! ! Silo system pressure relief valve is standard essential equipment, which can release excessive pressure within the bunker, but also can alleviate the negative pressure. If the air pressure inside the silo with the outside atmospheric pressure difference reaches abnormal situations. Pressure relief valve will open automatically to ensure the absolute safety of the silo system. After the pressure is back to normal, the valve will automatically recover. Under normal circumstances, produce an imbalance within the compartment pressure (high or negative) to the silo feeding or nesting will, when the pressure inside the warehouse and warehouse outside of difference within a certain range over the silo can bear range, it will cause damage to the silo equipment, and even more explosive storage and other major accidents. Product Description: Pressure relief valve body: carbon steel surface spray (gray) valve plate: carbon steel, black special sealed connection: clamp connections, with a ring waterproof cover: FRP technical parameters: Model: BPS250A positive pressure range : 280-1000mmH --- 2O ▲ negative pressure range: -20-120mmH --- 2O ▲ Weight: 9.5