Azbil Corporation No. SS2-8113-1200 - 7 - Valves with type DAP actuator Table 7 Air-to-close and Air-to-open Note) 1) Positioner is employed in general. 2) When a back-up system for pressure drop of supply air souce is used, select the allowable differential pressure whichever is lower-constant supplied air pressure or 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) 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 kPa {kgf/cm2} Differential pressure kPa {kgf/cm2} 6 8 JIS63K ANSI 900, 1500 JPI 900, 1500 DAP560 490 {5.0} 25900 {264} DAP1000 25900 {264} ANSI 2500 JPI 2500 DAP560 29300 {298} 36700 {374} DAP1000 27900 {284} 43100 {439} 2 4