Pfeiffer AT Actuator Pneumatic Rotary Actuator Type SRP and Type DAP

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1 Pfeiffer AT Actuator Pneumatic Rotary Actuator Type SRP and Type DAP Application Single or double acting piston actuator for butterfly valves and other final control elements with turning throttling elements Maximum opening angle ϕ = 90 The Types SRP and DAP Pneumatic Rotary Actuators are piston actuators for throttling or on-off services. Special features Travel stops externally adjustable (±4 %) Square-end position either diagonal (European standard) or parallel Freely adjustable position indicator (in 45 steps) No special tools needed for mounting and conversion Variety of spring cartridges Power transmission without clearance due to involute serrations Direction of rotation reversible without using additional components Surface treatment using a special method Attachment of positioners, limit switches, solenoid valves and other accessories according to VDI/VDE Designed for signal pressures of up to 8 bar and for continuous operation at temperatures between 20 and +80 C Versions Type SRP (Fig.1) Pneumatic Rotary Actuator, single acting with spring-return mechanism in sizes 15 to 5000 Type DAP Pneumatic Rotary actuator, double acting without spring-return mechanism in sizes 15 to 5000 Fig. 1 Pfeiffer Type AT Pneumatic Rotary Actuator Further versions With manual override For continuous operation at temperatures from 20 to 150 C using Viton O-rings or For continuous operation at temperatures from 40 to 80 C with silicone gaskets Edition April 2000 Data Sheet

2 Principle of operation The signal pressure p st exerts a force at the piston surface which is balanced by the springs arranged in the actuator in the single-acting version and by a corresponding counterpressure in the double-acting version. The pinion shaft converts the force created at the pistons into a rotary motion. Adjustable travel stops for the OPEN and CLOSED position allow a fine adjustment of the final position by ±4. In the single-acting version, the number of springs determine the return spring torque and the loading pressure required. Fig. 3 shows the useable air-driving torques M dle for single-acting version M dld for double-acting version as well the useful spring-driving torque M df dependent on the angle of rotation ϕ. Fail-safe position There are two different rotary motions in the Type SRP Actuator which become effective when the pistons are relieved of pressure or when the supply air fails. The following applies when looking at the valve from the actuator. "Springs turn clockwise", A clockwise motion is made when the pressure is reduced. "Springs turn counterclockwise", A counterclockwise motion is made when the pressure is reduced. The Type DAP Actuator is designed without springs. A defined final position is not achieved when the supply air fails. Fig. 2 Sectional view of Type AT Pfeiffer 100% M dld The following details are required on ordering: Actuator type DAP... or SRP... Nominal size 15, 30, 60, 100, 150, 220, 300, 450, 600, 900, 1200, 2000, 3000 or 5000 Number of springs Only applies to single-acting Type SRP Fail-safe position Springs turn clockwise or counterclockwise (only applies to single-acting Type SRP) Supply air... bar Operating range Number of springs or bench range VDI/VDE bracket For attachment of positioner or signaling devices 66% M df 33% M dle 0% 0 90 Fig. 3 Torque curve at recommended supply pressure 2

3 Table 1 Technical data Actuator version Single acting Double acting Max perm. signal pressure 8 bar Sizes Perm. temperatures In continuous operation 20 to 80 C Connection point to valve EN 12116/DIN 3337 Connection point for Type 15 to 150 VDI/VDE 3845, size 1 positioner or Type 220 to 450 VDI/VDE 3845, size 3 signaling devices Type 600 to 5000 VDI/VDE 3845, size 4 Connection point for pilot valves VDI/VDE 3845 Table 2 Materials Body Cover Shaft Compression spring cartridge Piston WN AlMgSi0.5 F25 WN GD-AlSi8 Cu3 WN C22/stainless steel ASTM A Si Cr6 WN GD-AlSi8 Cu3 Table 3 Torque for double acting Type DAP Actuators Type Torque in Nm at a supply pressure of DAP 1.5 bar 3 bar 3.5 bar 4 bar 4.2 bar 4.5 bar 5 bar 5.5 bar 6 bar 6.5 bar 7 bar 7.5 bar 8 bar

4 Table 4a Torque in Nm for single acting Type SRP Actuators Supply pressure 2.5 to 4.2 bar Type SRP Torque in Nm at a supply pressure of Springs Spring torque 2.5 bar 3 bar 3.5 bar 4 bar 4.2 bar /side / / / / / / / / / / / / / / / / / / / / / / / / / / / / indicates recommended symmetrical sizing 4

5 Table 4b Torque in Nm for single acting Type SRP Actuators Supply pressure 4.2 to 8 bar Type SRP Torque in Nm at a supply pressure of Springs Spring torque 4.2 bar 4.5 bar 5 bar 5.5 bar 6 bar 8 bar /sides / / / / / / / / / / / / / / / / / / / / / / / / / / / / indicates recommended symmetrical sizing 5

6 Table 5 Dimensions in mm and weights for Type SRP and Type DAP Actuators Type ISO flange F04 F05 F05 F07 F07 F10 F10 F12 F12 F14 F14 F16 F16 Square end T-ISO A B C D M 5x8 M 5x8 M 5x8 M 5x8 M 5x8 M 5x8 M 5x8 M 5x8 M 5x8 M 5x8 M 5x8 M 6x10 M 6x10 E F G H I Lmin M N O P Q 1) Q1 1) ) R S W 1) M 5 M 5 M 6 M 6 M 8 M 8 M 10 M 10 M 10 M 16 M 16 M 20 M 20 W1 1) M 5 M 6 M 8 M 8 M 10 M 10 M 12 M 12 M 12 1) -d f8 2) hmax 2) h1min Z /65 56/ /115 80/ On request Weight in kg On req. 1) Versions C, D, E, P only have one flange 2) On request ØD R ØZ 4 4 C S H Square end P Connections "2" "4" "T" L B ØW ØW1 A X M N L ØQ ØQ1 O C h1 h G M5xE M6x12 DA/SR 3000 B Ød Fig. 4 Dimensions and connection points to valves F M N SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße 3 D Frankfurt am Main Telefon (0 69) Telefax (0 69) Internet:

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