Exhaust valve installed in the exhaust system piping damper, the general was usually closed, manual or electric opened fire, from the smoke effect. When the internal temperature of the flue gas exhaust pipe reaches 280 ℃ closed within a certain period of time to meet the fire resistance stability and fire integrity requirements, from the exhaust valve function. Smoke damper normally closed (NC, open telecommunications number, 280 degrees blown off, or manually turn off) generally used in exhaust systems, exhaust fan can be installed at the inlet of a control to open the control room when the fire extinction, When the chain can also be turned off to close the exhaust fan. Exhaust valves, with the three, each unit different names, some based on its operating temperature is called the exhaust valves, and some based on its use of nature called damper, but just an ordinary damper device side fuse metal exchange fuse into that kind of 280 degrees. 3. Automatic smoke damper (Metro Engineering) fire subway ventilation and air conditioning systems, exhaust valves have automatic fire alarm equipment and gas extinguishing system linkage control functions. Each automatic smoke dampers have two independent electric control signal, respectively, by EMCS, gas consumption system to monitor, control signals are DC24V ± 10% signal. Each automatic smoke dampers have six independent feedback signal (three open place, three off place) feedback signals are normally open dry contact signal. Construction and installation points 1. Valve mounting position, height, and export orientation must meet the design requirements, the connection should be firmly tight. 2. The valve means of various forms of end portion connected to the pipe line. The most important connections are threaded, flanged and welded connections. When the flange connection, if the temperature exceeds 350 ℃, due to bolts, flanges and gaskets creep relaxation, you should choose high temperature bolt material. 3. The valve must be visually inspected prior to installation, the valve plate should be consistent with existing national standards GB12220 "Universal Valve logo" requirement. For working pressure greater than 1.0MPa and the role played off valves on the main pipe, should be the strength and tightness test, passing behind the prospective use. Other valves may not be tested separately, stay in the inspection system pressure test. 4. strength test, the test pressure is 1.5 times the nominal duration of not less than 5min, the valve housing, packing should be no leakage. 5. damper tightness test price, the test pressure of 1.1 times the nominal; test pressure in the test duration should remain unchanged, the time should meet the requirements of Table 2, the valve sealing surface without leakage is qualified. First, the electric control valve product choice points 1. electric control valve to control the selection of the main parameters are: nominal diameter, nominal design, media allowable temperature range, flow coefficient. 2. For the required flow and opening height proportional to the strict occasions, should use special valve. High-precision adjustment process need to use electric V-type valve; diameter> 200 is preferably electrically adjustable butterfly valve series. 3. The valve sealing performance is one of the main indicators of the quality of the assessment of the merits of the valve. Valve sealing performance includes two aspects damper wholesale, namely leakage and leakage. Endoleak refers to the degree of media to reach the seal between the valve seat and the closure member. Leakage refers to the parts of the stem packing leak leak leak valve stem gasket and valve parts due to casting defects caused. Leakage is allowed to happen. 4. Adjust the valve flow characteristics are ideal for quick opening, parabolic, linear, equal percentage of four, need to choose the appropriate flow control valve has a characteristic based on the actual work flow characteristics. 5. Select the nominal diameter of the valve shall be determined according to the required flow capacity of the valve. Valve nominal diameter should not be too large or too small. Too large, increasing the project cost, and the valve is in the low percentage range, adjust the lower precision, the control performance deteriorated. Is too small, increase the system resistance, even when the valve is 100% open, the system still could not reach capacity requirements. 70 ℃ damper, Rui Xincheng air conditioning (certified), Qinghai dampers provided by Rui Xincheng Air Conditioning Equipment Co., Texas. Texas Rui Xincheng Air Conditioning Equipment Co., Ltd. (www.dzrxckt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Rui Xincheng conditioning in leadership with the staff warmly welcome all inquiries negotiations to create a better future Rui Xincheng air conditioning.