Principles wind speed calculated the amount of wind that is kept open doorway at a certain minimum amount of wind wind speed required; the principle method to calculate the amount of wind pressure is to keep the room pressure (to keep the stairwell positive purpose is not to smoke during a fire into the stairwell prejudice evacuation; keep the fire elevator room aims to prevent smoke entering the firefighters put out the fire channel) when the minimum air quantity required fire. So when the wind speed is much greater than the calculated amount of wind pressure method when calculating the amount of wind could cause the fire door can not open stairwell duct residual pressure valve, this time, you need to increase the pressure relief valve (or called valves, and pressure valve). Fire residual pressure valve has a lot of features, in order to ensure the success of the duct extinguishing residual pressure valve manufacturers, gas fire extinguishing system requirements for protected areas in extinguishing the fire zone kept closed during the release of the state, in order to ensure extinguishing concentration and immersion time. Extinguishing agent is released in the process, due to the rapid nature of the protection zone and closed extinguishing agent release will cause a sharp increase in the price of residual pressure valve duct pressure inside the protection zone, causing the destruction of envelope may ultimately lead to fire failure, and even cause more serious consequences. Duct residual pressure valve price, duct residual pressure valve, air conditioning provided by the Texas shenglong Shenglong ventilation and air conditioning plant. Texas shenglong ventilation and air conditioning plant (www.fengguan666.com) (www.dzsltfkt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead shenglong air conditioning and you hand into the brilliant, for a better future!