Superior structure: UNIFORM low flow resistance flow channel, rated flow coefficient adjustment is good: big adjustable range, or equal percentage flow characteristic optional linear tightness: choose soft seal, bellows seal, widely used to improve sealing performance : a variety of seat structures, fins, meet different technical parameters pressure temperature operation mode the open air, air-to-close seat structure percentage P single-seat flow characteristics, linear adjustable range of 50: 1 signal range Pr: 0.2 ~ 1bar, 0.4 ~ 2bar air pressure Ps: 1.4bar ~ 4bar seal level Ⅲ, Ⅳ, Ⅴ, Ⅵ ambient temperature - 30 ℃ ~ + 70 ℃ (Explosion proof See Locator parameters) Performance standards GB / T4213-92 basic error of ± 2.5% 1.5% hysteresis OFF signal valve fully open, the output signal 4 ~ 20mA DC, 0 ~ 10V DC CLOSED implement this performance indicators GB / T4213-92 standard electrical positioning parameters (not considered a user-supplied) Input signal 4 ~ 20mA DC, 0 ~ 10V DC input impedance of 300Ω, 250Ω, subject to the positioner output signal 4 ~ 20mA DC, 0 ~ 10V DC Explosion levels dIIBT4 / T5 / T6, dIICT4 / T5 / T6, intrinsically safe Nominal body parameter PN16, PN25, PN40, PN64 flange connection, (special: welded) Body Material WCB, SS304, SS316, SS316L Spool Material SS, SS304, SS316, SS316L, Stellite surfacing sealing materials PTFE, hard seal, a special high-temperature materials Bellows SS, SS304, SS316 packing PTFE, flexible graphite putter liner rubber asbestos gaskets 2Cr13, 1Cr18Ni9Ti asbestos spiral wound gasket flange standard GB9113-88, JB / T79-94, GB2555-81 room temperature type -60 ℃ ~ 250 ℃ Fluid temperature heat resistance -60 ℃ ~ 450 ℃ high temperature 450 ℃ ~ 560 ℃ low temperature -220 ℃ ~ -250 ℃ features attachment options E- explosion-proof (electrical Locator Explosion levels Optional: flameproof, intrinsically safe) X- band signal feedback (electric positioner with feedback or reprovision position transmitter) S- with hand wheel Q- completely cut off Accessory: Electrical Location , air filter regulator, air lock to secure his position valve, solenoid pilot piston type solenoid valve http://www.cnlidea.cn/product.asp?id=368 small diameter stainless steel solenoid valve (LD74A two-way, LD74 -23 two-way) http://www.cnlidea.cn/product.asp?id=366 http://www.cnlidea.cn/