No. SS2-8110-0600 Azbil Corporation - 2 - Performance Rated Cv value Refer to Table 1. Inherent rangeability Rated Cv value 0.63 to 0.16; 30:1 Rated Cv value 0.10 to 0.02; 25:1 Rated Cv value 0.01 to 0.001; 20:1 Allowable differential pressure Refer to Table 2. Leakage specification IEC 60534-4:2006 or JIS B 2005-4:2008 Standard.....Class IV : Leakage less than 0.01% of maximum valve capacity Option........Leakage less than 0.001% of maximum valve capacity Hysteresis error (with positioner) 1% F.S. or less Linearity (with positioner) ± 3% F.S. or less Dimensions Refer to Figure 1 and Table 3 and Table 4 . Weight 8 kg Actuator orientation Refer to Figure 2 Finish Blue (Musell 10B5/10), Silver, or other specified colors Notice for valve sizing of model VSM When a Micro-flow of a viscous fluid or with a high differential pressure is controlled, the fluid flow in the valve apt to become laminar. In general, valve capacities are defined assuming that the flow in the valve is turbulent. Therefore, it should be noted when selecting a valve size that the valve capacity may become insufficient unless a certain correction factor is taken into consideration for applying the basic a Cv calculation formula for size calculation at a laminar flow range. For model VSM Microflow Control Valves, a particular sizing system is used. Table 1 Flow coefficient Cv and stem travel Rated Cv value Plug and characteristic 0.001 0.002 0.005 0.01 0.02 0.05 0.10 0.16 0.25 0.40 0.63 Equal percentage contoured (%C) - - - - - - - - .. .. .. Linear contoured (LC) .. .. .. .. .. .. .. .. .. .. .. Rated travel (mm) 10 Table 2 Allowable differential pressure Air-to-close Actuator model no. Supply pressure kPa {kgf/cm2} Spring range kPa {kgf/cm2} Positioner Differential pressure MPa {kgf/cm2} PSK 1D 180 {1.8} 40 to120 {0.4 to 1.2} .. 9.8 {100} 270 (2.8) 40 to120 {0.4 to 1.2} .. 29.4 {300} 340 {3.5} 40 to 120 {0.4 to 1.2} .. 40.5 {413} Air-to-open Actuator model no. Supply pressure kPa {kgf/cm2} Spring range kPa {kgf/cm2} Positioner Differential pressure MPa {kgf/cm2} PSK 1R 140 {1.4} 40 to 120 {0.4 to 1.2} .. 6.0 {61.2} 270 {2.8} 80 to 160 {0.8 to 1.63} .. 29.4 {300} 340 {3.5} 120 to 210 {1.2 to 2.14} .. 40.5 {413} Note) 1) ..; Positioner is necessary,.. ; Can be operated either with or without positioner. 2) All valves which employ graphite packing are incorporated with a positioner as a standard provision.