Azbil Corporation No. SS2-8113-0300 - 5 - Note) The above graphs indicate typical flow characteristic a. Equal percentage characteristics (%TF: Soft seat) b. Linear characteristics (LTF: Soft seat) Figure 2-2 Flow characteristics: High-flow characteristic type (%TF, LTF) Table 5 Quick-opening type plug Normal size (inches) 1. 2 2. 3 4 6 8 Port size (inches) 1. 2 2. 3 4 6 8 Rated Cv value (QS) 35 55 95 135 220 460 720 Rated travel (mm) 10 13 19 19 25 30 50 Figure 3 Bellows Type by Temperature and Pressure Ranges 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. Figure 4 Temperature and maximum differential pressure range of soft-seat type Note) If there is any possibility to cause errosion due to saturated steam or superheated-water, use the metal seat. Note) When cavitation/flushing service, oil prohibitive service, or retention of valve-close performance is required, use of Stellite is recommended regardless of temperature or 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 (%) 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 -50 0 +100 +200 +300 Constant differential pressure Fluid temperature ( C) kPa {kgf/cm2} 1 5