Azbil Corporation No. SS2-8113-1100 - 5 - Note) The above graphs indicate typical flow characteristics. a. Equal percentage characteristics (%VF: metal seat) b. Linear characteristics (LVF: metal seat) c. Equal percentage characteristics (%TF: Soft seat) d. Linear characteristics (LTF: Soft seat) Figure 2 Flow characteristics: High-flow characteristic type cage Figure 3 Bellows Type by Temperature and Pressure Ranges Figure 4 Temperature and maximum differential pressure range of soft-seat type Note) Bellows type are classified into Formed bellows type I, II and welded bellows by temperature and pressure ranges. Please refer to No. SS2-BSL100-0100 about detail of bellows specification. Note) If there is any possibility to cause erosion due to saturated steam or superheated-water, use the metal seat. Note) 1. SCS24 (Precipitation-hardened stainless steel) requires no Stellite. 2. For cavitation / flashing service or oil free service, SCS24 or Stellite is recommended regardless of temperature and differential pressure. Figure 5 Temperature / normal differential pressure ranges requiring Stellite 100 50 20 10 5 2 0 20 40 60 80 100 Cv value (%) Travel (%) 100 80 60 40 20 0 0 20 40 60 80 100 Cv value (%) Travel (%) 100 50 20 10 5 2 0 20 40 60 80 100 Cv value (%) Travel (%) 100 80 60 40 20 0 0 20 40 60 80 100 Cv value (%) Travel (%) 3 2 1 -50 -30 +300 +350 Maximum pressure(MPa) Welded bellows Formed bellows type II Formed bellows type I Fluid temperature ( C) Glass-inserted PTFE PTFE Carbonfiber inserted PTFE Maximum differential pressure Fluid temperature ( C) 2940 {30} 1470 {15} 2940 {30} 1470 {15} 490 {5} 0 kPa {kgf/cm2} -80 +100 +200 +230 Stellite 1470 {15} 981 {10} 490 {5} 0 -196 0 +100 +200 +300 Maximum pressure kPa {kgf/cm2} Fluid temperature ( C) 2 3