Ammonia pipeline shut-off valves or devices designed specifically ammonia gas was. Note that the fire safety requirements on the structure. PTFE packing, sealing, reliable, absolute physical leakage. Sealing Teflon or nylon material used for valve body material, soft sealing, reliable sealing. Suitable for ammonia gas, liquefied petroleum gas piping system, as the lifting device, also applies to the other temperature ≤80 ℃ conduit. Ammonia shutoff valve with a stable sealing performance, safety and reliability, corrosion resistance, is no medium, leakage and easy operation features, successfully solved by ordinary chemical pipeline valves poor corrosion resistance, easy to perforate the casing and sealing performance poor, easy to leak problem, especially for transferring the chemical industry ammonia gas pipeline to, and meet the requirements of long-term reliable use. Its tightness, maintainability, security. Product Features: 1. For general valve poor corrosion resistance, easy to perforate the casing shortcomings, according to the specific characteristics of the medium, ammonia special valve in the valve body material selection, corrosion-resistant steel (carbon steel corrosion resistant alloy elements added), may resistance to ammonia, ammonia corrosion, low temperature to -40 ℃, the maximum guarantee working conditions requirements. 2. Vice pairing ammonia valve sealing structure type of ball, planar sealing automatic compensation, to the effect of double insurance, stable sealing performance, no adhesive wear, effectively solved by ordinary chemical pipeline valve sealing performance is poor, easy to leak problems. 3. Product flange using tongue and groove seal structure, even in the case of the pipeline pressure fluctuations to ensure sealing flange is absolutely reliable. 4. The sealing device used in a multi-stage Teflon sealant to form a combination seal, ensure that the valve in the life of stuffing no media leaks, eliminating the common seal valve stuffing weak, medium and easy leakage, and even cause accidents possible. Product Standard: ammonia shutoff valve to develop enterprise standards GB / T12235 standard basis. Enterprise standard in material selection, structural design based entirely on chlorine, chlorine medium corrosion properties and working conditions were, the technical parameters of indicators than GB. Connection Size: DN LHD D1 D2 b F Zd 25 160 285 115 85 65 16 2 4- # 14 32 180 300 135 100 78 18 2 4- # 18 40 200 320 145 110 85 18 2 4- # 18 50 230 380 160 1251002034- # 19 6,529,042,018,014,512,022 3 8- # 19 8,031,045,019,516,013,522 3 8- # 19 100 350 520 2301901602438- and # 23 125 400,558,270,220,188 2838- # 25 150 480 750 3002502183038- # 25200600950360 31027834312- # 252,506,501,050,425 37033236312- # 30 for 300 7,501,120,485,430,390,403 16- # 30