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MSD-III Diaphragm ActuatorEngineeringGREAT SolutionsMulti-Spring Diaphragm Actuator
MSD-lll Diaphragm ActuatorMSD-lll Diaphragm ActuatorPrecise operation andreliable repeatabilityThe MSD-III is a pneumatic diaphragm actuator with a robustrolling diaphragm and multi-spring design. Available in directacting (DA) and reverse-acting (RA). Fail open and close areachieved by the multi-spring force or compressed air. Additionally,the rugged one-piece cast yoke, pressed diaphragm case andspecial nylon-reinforced diaphragm provide dependable high forceactuation performance. The MSD-III is available in five sizes tocover a wide range of applications. A manual handwheel is anoptional extra on both direct-acting (DA) and reverse-acting (RA)actuators as an option.Key features Multi-spring design- Excellent long-term accuracy and failmode reliability are achieved throughthe multiple spring design with highcompression force Rugged one-piece yoke- Provides maximum strength and rigidity Diaphragm case- Pressed steel case provides highmechanical strength and protection inthe event of over-pressurisation.Further reinforcements are providedfor actuator sizes greater than 290 toensure safe operation Thrust & stroke capability- Two actuator types and five sizes allowa wide range of applications Diaphragm- Moulded elastomer with fabric insert forstrength, long life and high sensitivity.The precisely formed diaphragmeliminates any friction and reducesvariations in the effective areas duringlinear operation Various air connection sizes- Various air connection sizes providevarious accessory applicationsAir chamber volume is minimisedto reduce dead-time Linearity- The moulded rolling diaphragm anddeep cases minimise area change andprovide a linear relation between traveland air pressureBenefits Excellent performance As a multi-spring type, operation isprecise and repeatability is excellent,minimising the hysteresis error Fast response The actuator air chamber volume isminimised to reduce dead-time andbe more responsive to changes inair pressure Rugged constructionT he MSD-III diaphragm actuator hasundergone extreme durability tests andwith numerous installations over 20 years,it has proven to be a reliable solution forcontrol valvesProven, reliable solutionfor control valves
Technical DetailsTypePneumetic multi-spring diaphragm actuatorTemperature-29 C to 80 C (optional -45 C, -55 C)Spring actionDA (Direct Acting - Springs to open)RA (Reverse Acting - Springs to close)Operation pressure 4.2 kgf/cm2 to 5.0 kgf/cm2Optional manual overrideTop handwheel (250, 290, 370)Side handwheel (480, 550)CertificatesSIL, TRCU, ATEXStroke range20mm to 130mmMaterialRefer to material table on next pageSpring bench set listActuator sizeEffective area (cm2)Stroke 00705501490Spring range (kg/cm2)Seat thrust (kgf) @ 5kg/cm2RADARADA1.6 - 3.20.8 - 2.4432702-0.6 - 1.8-8640.8 - 3.20.8 - 3.2216486-0.6 - 2.4-7022.5 - 4.00.7 - 1.787511552.1 - 3.30.6 - 1.373512951.8 - 4.00.7 - 2.26309801.5 - 3.30.6 - 1.752511551.1 - 4.00.7 - 2.63858400.9 - 3.30.6 - 2.031510502.6 - 4.40.8 - 2.1162518132.0 - 3.40.7 - 1.8125020002.0 - 4.40.8 - 2.5125015631.5 - 3.40.7 - 2.2937.517501.4 - 4.40.8 - 3.087512501.0 - 3.40.7 - 2.662515002.0 - 4.50.5 - 1.9215033331.6 - 3.50.6 - 2.0172032251.0 - 4.50.5 - 2.4107527951.7 - 4.00.5 - 2.51827.526881.5 - 3.50.6 - 2.31612.529030.7 - 4.00.5 - 3.2752.519350.6 - 3.50.6 - 3.064521501.6 - 4.20.5 - 1.8238447681.0 - 3.7-1490-1001.3 - 3.60.5 - 2.3193740231300.6 - 3.60.5 - 2.88943278
MSD-lll Diaphragm ActuatorMaterialsDA TypeRA TypeNoPart nameStandard material1SpringCr-Si coil spring wire2YokeA216 WCB3Guide bushBronze4Stem clamp304 SS5Diaphragm case (upper/lower)Carbon steel6Diaphragm plateCarbon steel7DiaphragmEPDM8Actuator stem304 SS9SpacerCarbon steel10Diaphragm washerCarbon steel11Bolt304 SS12Nut304 SS13O-ringEPDM14Extension adaptorAluminum
Product dimensionsFigure 1. Standard (without handwheel)Figure 2. Top handwheel type (250, 290, 370)Figure 3. Side handwheel type (480, 550)Figure 4. Top handwheel type (480, 550)Dimensions & weightsCentre of gravityWeights )L1(mm)StandardWith 101502145500.745904.16405402.8Standard (mm)With handle (mm)
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MSD-lll Diaphragm Actuator MSD-lll Diaphragm Actuator The MSD-III is a pneumatic diaphragm actuator with a robust rolling diaphragm and multi-spring design. Available in direct-acting (DA) and reverse-acting (RA). Fail open and close are achieved by the multi-spring force or compressed air. Additionally,
