G41F pneumatic fluorine-lined diaphragm valve is a special form of valve with cut-off function, its miserly closure is composed of a steel disc and a diaphragm made of soft materials (rubber and fluoroplastic composite), and the valve body cavity is separated from the valve cover cavity to achieve the purpose of cutting off the medium in the pipe.
1. The composite diaphragm valve separates the inner cavity of the lower part of the valve body from the inner cavity of the valve cover, and forms a DC channel with it, so that the valve stem, disc and other internal parts of the upper part of the diaphragm are completely isolated from the medium, and the packing sealing structure is omitted, and the internal and external leakage of the medium can be avoided at the same time;
2. The valve with Teflon fluoroplastic lining layer using FEP (Teflon) fluoroplastic and all-rubber composite diaphragm can be suitable for various strong corrosive media except "molten alkali metal and elemental fluorine".
3. The diaphragm as an actuator is prone to fatigue fracture due to frequent opening and closing, and should be replaced regularly according to the working conditions and the characteristics of the medium.
4. The anti-corrosion performance of fluoroplastics and the recommended use of fluoroplastic lining performance table for temperature, wind valves and pipeline accessories.
| No. | Part name | Gray cast iron | Cast steel | Rust-resistant cast steel | Utra low carbon stainless steel acid cast steel | ||
| Z | C | P | R | PL | RL | ||
| 1 | Body/bonnet | HT250 | WCB | CF8 | CF8M | CF3 | CF3M |
| 2 | Disc/stem | 25 | 2Cr13 | 1Cr18Ni9 | 1Cr18Ni12Mo2Ti | 00Cr18Ni10 | 00Cr17Ni14Mo2 |
| 3 | lining/Seat | PCTEF (F3), FEP (F46), PFA (soluble F4), PP, PO | |||||
| 4 | Diaphragm | FEP(F46)CR(Neoprene)PFA(Soluble F4)FPDM(ethylene propylene monomer) | |||||
| 5 | Stand | PTFE(F4) | CF8 | CF8 | |||
| 6 | Stem nut | ZCuAl10Fe3 | ZCuAl10Fe3 | ZCuAl10Fe3 | |||
| 7 | Fastening bolt | 35 | 1Cr17Ni2 | 1Cr18Ni9Ti | |||
| 8 | nut | 45 | 0Cr18Ni9 | 0Cr18Ni9 | |||
| 9 | handwheel | WCB | WCB | WCB | |||
| Nominal diameter |
L |
D | D1 | D2 | f | b | Z-Φd | D | D1 | D2 | f | b | Z-Φd | |
| DN(mm) | NPS(inch) | PN1.0MPa | PN1.6MPa | |||||||||||
| 15 | 1/2 | 125 | 80 | 55 | 40 | 2 | 12 | 4-Φ12 | 95 | 65 | 45 | 2 | 14 | 4-Φ14 |
| 20 | 3/4 | 135 | 90 | 65 | 50 | 2 | 14 | 4-Φ12 | 105 | 75 | 55 | 2 | 16 | 4-Φ14 |
| 25 | 1 | 145 | 100 | 75 | 60 | 2 | 14 | 4-Φ12 | 115 | 85 | 65 | 2 | 16 | 4-Φ14 |
| 32 | 11/4 | 160 | 120 | 90 | 70 | 2 | 16 | 4-Φ14 | 135 | 100 | 78 | 2 | 18 | 4-Φ18 |
| 40 | 11/2 | 180 | 130 | 100 | 80 | 3 | 16 | 4-Φ14 | 145 | 110 | 85 | 3 | 18 | 4-Φ 18 |
| 50 | 2 | 210 | 140 | 110 | 90 | 3 | 16 | 4-Φ14 | 160 | 125 | 100 | 3 | 20 | 4-Φ18 |
| 65 | 21/2 | 250 | 160 | 130 | 110 | 3 | 16 | 4-Φ14 | 180 | 145 | 120 | 3 | 20 | 4-Φ 18 |
| 80 | 3 | 300 | 185 | 150 | 125 | 3 | 18 | 4-Φ 18 | 195 | 160 | 135 | 3 | 22 | 4-Φ 18 |
| 100 | 4 | 350 | 205 | 170 | 145 | 3 | 18 | 4-Φ 18 | 215 | 180 | 155 | 3 | 22 | 8-Φ18 |
| 125 | 5 | 400 | 235 | 200 | 175 | 3 | 20 | 8-Φ18 | 245 | 210 | 185 | 3 | 24 | 8-Φ18 |
| 150 | 6 | 460 | 260 | 225 | 200 | 3 | 20 | 8-Φ18 | 280 | 240 | 210 | 24 | 8-Φ23 | |
| 200 | 8 | 570 | 315 | 280 | 255 | 3 | 22 | 8-Φ 18 | 335 | 295 | 265 | 26 | 8-Φ23 | |
| 250 | 10 | 680 | 370 | 335 | 310 | 3 | 24 | 12-Φ28 | 390 | 350 | 320 | 3 | 28 | 12-Φ23 |
| 300 | 12 | 790 | 435 | 395 | 362 | 4 | 24 | 12-Φ23 | 440 | 400 | 368 | 28 | 12-Φ23 | |
