No. SS2-8113-0400 Azbil Corporation - 6 - 3) Take care not to cause the inlet pressure (P1) to exceed allowable differential pressure at valve-close. 4) Allowable differential pressure limit differs depending on valve seat leakage volume. Figures in the upper portion of the column denote pressure under a leakage rate of 0.01%. Those on the lower side denote pressure under a leakage rate of 0.001%. Valves with type DAP actuator Note) 1) Positioner is employed in general. 2) When a backup system for pressure drop at the air source is used, select the allowable differential pressure from whichever is lower-constant supplied air pressure or backup system set pressure (trip pressure). 3) Take care not to cause the maximum allowable differential pressure to exceed the maximum operating pressure designated by JIS B 2201-1984 or ANSI B 16.34-1981. 4) Allowable differential pressure limit differs depending on valve seat leakage volume. Figures in the upper portion of the column denote pressure under a leakage rate of 0.01%. Those on the lower side denote pressure under a leakage rate of 0.001%. Table 8 Air-to-close and Air-to-open Rating Actuator Model No. Supply pressure kPa {kgf/cm2} Differential Pressure (by Port size(inch)) kPa {kgf/cm2} Cv<=4.0 Cv=6.3 Cv=12 1 . inch 1 . inch 2 inches 2 . inches 3 inches JIS 63K ANSI 900, 1500 JPI 900, 1500 DAP 560 490 {5.0} 25900 {264.0} 25900 {264.0} 25900 {264.0} 25900 {264.0} 21800 {222.0} 13000 {132.0} 8070 {82.2} 5810 {59.2} 25900 {264.0} 25900 {264.0} 25900 {264.0} 25900 {264.0} 21200 {216.0} 12500 {127.0} 7670 {78.2} 5510 {56.1} DAP 1000 25900 {264.0} 22100 {225.0} 13600 {138.0} 9850 {100.0} 25900 {264.0} 21600 {220.0} 13200 {134.0} 9550 {97.3} DAP 1500 25900 {264.0} 21000 {214.0} 15100 {153.0} 25900 {264.0} 20600 {210.0} 14800 {150.0} ANSI 2500 JPI 2500 DAP 560 30900 {315.0} 30800 {314.0} 30700 {313.0} 30700 {313.0} 30400 {309.0} 17500 {178.0} 13000 {132.0} 8070 {82.2} 29900 {304.0} 29800 {303.0} 29700 {302.0} 29900 {304.0} 29800 {303.0} 17000 {173.0} 12600 {128.0} 7770 {79.2} DAP 1000 29400 {299.0} 22100 {225.0} 13600 {138.0} 28900 {294.0} 21700 {221.0} 13300 {135.0} DAP 1500 28800 {293.0} 21000 {214.0} 28400 {289.0} 20700 {211.0}