[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - check] opening and closing pieces by medium flow and strength to turn itself on or off, in order to prevent the media called backflow check valve. Check smoke damper are automatic valves, mainly for fire control on the media one-way flow of pipeline valves, only allowed media to flow in one direction damper to prevent accidents. Check valve structure is divided by the damper effect, can be divided into lift check valve, swing check valve and butterfly valve in three ways: 1. Lift check into vertical and horizontal . 2. Swing check into a single lobe, double valve type and Orange Peel three. 3. butterfly valve for straight-through. Several more formal check valve in the connection can be divided into threaded, flanged, welded connections and wafer four. [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - smoke damper] definition given in the national standards: 1. smoke damper fire damper in smoke-ventjng system installed in the mechanical exhaust system pipe, usually was turned on, when the fire inside the exhaust pipe when the flue gas temperature reaches 280 ℃ closed, and in a certain amount of time to meet the leakage of smoke and fire integrity requirements, from the effects of smoke fire retardant across the valve. Smoke damper is generally made up of body, blades, actuators and temperature sensors and other components. Damper 70 ℃, Tianjin dampers, fire dampers Jinzhong Ji Tianjin Tianjin Jinzhong Ji by HVAC manufacturers to provide purification equipment. Tianjin Jinzhong Ji HVAC purification equipment Limited (www.Jzjnt.com) strong, credible, in Tianjin fans, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the group into the brilliant and you work for a better future!