Study the temperature and pressure limits of common valve packing

Valve packing materials are affected by the temperature and pressure of the fluid. Obviously, the filler material will become more fluid as the temperature rises. And easy to squeeze out of the stuffing box. High pressure can also cause extrusion. Therefore, the combination of high temperature and high pressure will greatly accelerate the extrusion. The following table provides a comparison of various packing materials and thermometers with standard-length bonnet and increased-length bonnet. The increased bonnet temperature limit is always higher because it is longer and the packing is placed far from the fluid temperature. Figure 2.43 through Figure 2.45 provide pressure and temperature limits for universal packing. Filler Material Valve Pressure Range (ANSI / Standard Length Bonnet Increased Length Bonnet Length Valve Teflon 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 450 ~ -30 ~ 230 â„ƒ -20 ~ 450? -30? 230? -150? 600? -100? 315? -150? 700? -100? 370 Â° C Braided Polytetrafluoroethylene 150 ~ 600 16 ~ 100 900 ~ 2500 160 ~ 400 -20 ~ 500? 30 ~ 260 â„ƒ -20 ~ 500? -30 ~ 260 â„ƒ -150 ~ 600? -100 ~ 315 â„ƒ -150 ~ 700? -100 ~ 370 â„ƒ Glass-filled Teflon 150 ~ 600 16 ~ 100 900 `2500 160 ~ 400 -20 ~ 500 ~ -30 ~ 260 â„ƒ -20 ~ 700 ~ -30 ~ 260 â„ƒ -150 ~ 600 ~ -100 ~ 315 â„ƒ -150 ~ 700 ~ -100 ~ 370 â„ƒ Asbestos free material 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 750 ~ -30 ~ 400 â„ƒ -20 ~ 800 ~ -30 ~ 425 â„ƒ -20 ~ 2000 ~ -30 ~ 650 â„ƒ -20 ~ 1200 ~ -30 ~ 650 â„ƒ Graphite 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 - 20 ~ 750 ~ -30 ~ 400 â„ƒ -20 ~ 800 ~ -30 ~ 425 â„ƒ -20 ~ 1500 ~ -30 ~ 815 â„ƒ -20 ~ 1500 ~ -30 ~ 815 â„ƒ Perfluoroelastomer 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 450 ~ -30 ~ 230 â„ƒ -20 ~ 450 ~ -30 ~ 230 â„ƒ -20 ~ 600 ~ -30 ~ 315 â„ƒ -20 ~ 700? -30 ~ 370 â„ƒ Perfluoroelastomer 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 550? -30 ~ 290 â„ƒ -20 ~ 550? -30 ~ 290 â„ƒ -20 ~ 700? -30 ~ 370 â„ƒ -20 ~ 800 ~ -30 ~ 425 â„ƒ Filler material Valve pressure range (ANSI / standard length Bonnet increase and increase the length Bonnet length Teflon valve 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 450 ~ -30 ~ 230 â„ƒ -20 ~ 450 ~ -30 ~ 230 â„ƒ -150 ~ 600 ~ -100 ~ 315 â„ƒ -150 ~ 700 ~ -100 ~ 370 â„ƒ Braided Teflon 150 ~ 600 16 ~ 100 900 ~ 2500 160 ~ 400 -20 ~ 500 ~ -30 ~ 260 â„ƒ -20 ~ 500 ~ -30 ~ 260 â„ƒ -150 ~ 600 ~ -100 ~ 315 â„ƒ -150 ~ 700 ~ -100 ~ 370 â„ƒ Glass-filled PTFE Ethylene 150 to 600 16 to 100 900 to 2500 to 400 to 500 to 300 to 260 to -20 to 700 to -30 to 260 to 150 to 600 to 100 to 315 to 150 to 700 to 100 ~ 370 â„ƒ Asbestos Free 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 750 ~ -30 ~ 400 â„ƒ -20 ~ 800 ~ -30 ~ 425 â„ƒ -20 ~ 2000 ~ -30 ~ 650 â„ƒ -20 ~ 1200 ~ -30 ~ 650 â„ƒ Graphite 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 - 20 ~ 750 ~ -30 ~ 400 â„ƒ -20 ~ 800 ~ -30 ~ 425 â„ƒ -20 ~ 1500 ~ -30 ~ 815 â„ƒ -20 ~ 1500 ~ -30 ~ 815 â„ƒ Perfluoroelastomer 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 450 ~ -30 ~ 230 â„ƒ -20 ~ 450 ~ -30 ~ 230 â„ƒ -20 ~ 600 ~ -30 ~ 315 â„ƒ -20 ~ 700 ~ -30 ~ 370 â„ƒ Perfluoroelastomer 150 ~ 600 16 ~ 100 900`2500 160 ~ 400 -20 ~ 550 ~ -30 ~ 290 â„ƒ - 20 ~ 550? -30 ~ 290 â„ƒ -20 ~ 700 ~ -30 ~ 370 â„ƒ -20 ~ 800 ~ -30 ~ 425 â„ƒ