| Diaphragm Reverse/Direct | Piston DSL,DSR/ springreturn | Hydraulic system |
 |  |  |
| Application: Desuperheaters and small water valves | Application: Steam conditioning valves and large Desuperheaters and water valves | Application: Turbine bypass and other applications Which require large actuating force and fast and accurate control |
| Pneumatic: Diaphragm | Pneumatic, Piston, Double acting,double acting spring closing | Hydraulic |
| Supply pressure: Max 2.5 barg (35 psig) | Supply pressure: Max 7 barg (100psig) | Supply pressure: Max 210 barg (3000 psig) Operating 160 barg ( 2350 psig) |
| Control signal: 4-20 mA, or 3-15 psi (to positioner ) | Control signal: 4-2-MA, or 3-15 psi (to positioner) | Control signal: 4-20-mA, or 3-15 psi ( to PCS ) |
| Size 11inch ,13 Inch ,15 inch | Max cylinder dia 600 NB | 10 to 12 Valves per system |
| Max stroke: 50 mm (2”) | Max stroke: 350 mm | Max stroke: 350 (14”) |
| Stroking speed: Slow | Stroking speed: Moderate, less than 1 sec when required | Max stroke: Fast ( less than 1 sec. if required ) |
| Air to open – Reverse . Air to close –Direct . | Alternative piston actuators: STI | Standard fluid: Mineral oil. Option: Fire resistant fluid. Used together with: Hydraulic Supply Unit, HSUPosition Control System, PCSPosition Feedback System, PFSHydraulic Valve Panel, HVP |
