Azbil Corporation No. SS2-8113-1200 - 13 - Valves with type DAP actuator Table 13 Air-to-close and Air-to-open Note) 1) Positioner is employed in general. 2) In case a back-up system is used for pressure drop of supply air, select the allowable differential pressure whichever is lower-the operating supply air pressure or the back-up system set pressure (trip pressure). 3) Allowable differential pressure at valve-close in the above table is under the condition of ..P P1 (P2 0). Allowable differential pressure at full closure varies depending on the outlet pressure (P2). Detailed information is avail able on request. 4) Take care not to cause the maximum allowable differential pressure to exceed the maximum operating pressure designated by ANSI B16. 34-1981 or JIS B2201-1984. 5) Take care not to cause the inlet pressure (P1) to exceed the allowable differential pressure at full closure. 6) The upper figures denote the operating allowable differential pressure. The lower denote the allowable differential pressure at full closure. Rating Actuator model No. Supply pressure Nominal size(inches) 290 kPa {kgf/cm2} 390 kPa {kgf/cm2} 490 kPa {kgf/cm2} Differential pressure kPa {kgf/cm2} JIS63K ANSI 900, 1500 JPI 900, 1500 DAP 560 6 19400 {198} 25900 {264} 25900 {264} 23700 {242} 25900 {264} 25900 {264} ANSI 2500 JPI 2500 19400 {198} 25900 {264} 32400 {330} 27600 {281} 38100 {389] 43100 {440} JIS63K ANSI 900, 1500 JPI 900, 1500 DAP 1000 8 18700 {191} 2500 {255} 25900 {264} 25900 {264} 25900 {264} 25900 {264} ANSI 2500 JPI 2500 18800 {192} 25000 {255} 31300 {319} 43100 {440} 43100 {440} 43100 {440} 2 4