First, the electric control valve product selection points 1. electric control valve selection of main control parameters are: nominal diameter, nominal pressure design, media allowable temperature range, the flow coefficient. 2. For the required flow and opening height is proportional strictly the case, the flue damper, should use special valve. Precision adjustment process need to use electric V-type valve; diameter> 200 preferably electric control valve series. 3. The valve sealing performance is one of the main indicators for assessing the quality of the merits of the valve. Valve sealing performance includes two aspects, namely leakage and leakage. Seal leakage refers to the degree of media to reach between the seat and the closure member. Leakage refers to the parts of the stem packing leak leak, fire dampers principle, the stem portion of the gasket and valve leak caused due to casting defects. Leakage is allowed to happen. The valve has a quick opening flow characteristics desired, parabolic, linear, equal percentage of four, must select control valve having suitable flow characteristics based on the actual flow characteristics. 5. Adjust selected valve nominal diameter of the valve should be determined according to the required flow capacity. 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 lower precision, the control performance deteriorated. Is too small, increase system resistance, Tanggu fire dampers, even when the valve is 100% open, the system still could not reach the capacity requirements. Products: Electric multi-leaf off valve, with the composition of the sleeve valve imported from Germany PS Series actuators. Within the electric actuator servo system, without reprovision servo amplifier with an input control signal (4-20mADC or 1-5VDC) and single-phase power to control the operation to realize the pressure, flow, temperature, level and other parameters adjusted . Balanced valve plug structure, with good plug stability, easy to produce vibration, low noise sensitivity, allowing the use of large pressure difference, simple connection, which is widely used in flow coefficient, leakage power requirements more stringent , metallurgy, petroleum, chemical, light industry, industrial automation control systems. Our sophisticated production equipment, fire dampers wholesale, advanced manufacturing technology, detection means complete, with high strength independent research and innovation, the main products are: air conditioning units, VAV air conditioners, damper actuators, insulation hose, fire valves, smoke fire damper, high-temperature exhaust fan, fire temperature exhaust machine, fire (ventilation) tank chassis ventilation centrifugal, plenum, axial fans, fan coil, aluminum outlet, ventilation hoses, plastic soft tube (snakeskin tube) and other air-conditioning end products. Damper wholesale, Rui Xincheng air conditioning, Tanggu fire dampers are provided by the Texas Air Conditioning Equipment Co., Ltd. Rui Xincheng. Rui Xincheng Texas Air Conditioning Equipment Co. (www.dzrxckt.com) is located in Dezhou Wu Lu right Tuen County Industrial Park. Scraps and development in the wave of market economy, the current Rui Xincheng air conditioning has a high profile in fan, ventilation equipment, and enjoys a good reputation. Rui Xincheng air conditioning made the whole network business alliance certification, marking our service and management level has reached a new height. Rui Xincheng air conditioning all employees willing to work with all people of insight and common development, for a better future.