HD-series
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HD-Series Pneumatic & Hydraulic Actuators for Heavy Duty Service Process Management EMERSON. CONSIDER IT SOLVED".

Temperature Ranges Bettis HD-Series pneumatic and hydraulic actuators are ideally suited for operating ball, butterfly, plug valves, dampers and other 90 degree turn devices. The HD-Series actuators provide a practical and reliable method for opening and closing valves by remote control without the need for expensive and unnecessary gearing, hydraulic pumps or other motor driven devices. All HD-Series heavy duty actuators are designed for operating temperatures of -20°F to +200°F(-29°C to +93°C). Optional low temperature trim allows continuous operation from -50°F to +180°F (-46°C to...

6 Bi-directional Travel Stops. Travel stops are an integral part of the actuator allowing 80° to 100° total travel adjustment. Extended travel stops are optional. 7 Piston Seals. Dual pressure-energized, wear-compensating lip seals help to evenly disperse lubricants for exceptional life while minimizing seal and cylinder wear. Optional seals for high or low temperature service and other unique applications are available. 8 XylanTM Cylinder Coating. HD actuators use rugged Xylan cylinder coating. Xylan combines PTFE and organic polymers to provide for excellent corrosion protection. Because...

OPERATING PRINCIPLE Scotch-Yoke Mechanism A balanced scotch-yoke mechanism produces torque that closely matches the requirements of most quarter-turn valves. Unlike other methods, such as a crank arm that produces its lowest torque at the start and the end of each stroke, the balanced scotch-yoke produces its highest torque at the start and the end of each stroke, providing maximum torque precisely where it is required to efficiently operate most quarter-turn valves. As the piston moves, the length of the moment arm is changing constantly. Because the effective moment arm is longest at the...

TYPICAL SPECIFICATIONS The following information may be used as a guide to compose specifications for HD-Series actuators. Bettis supplies actuators that meet or exceed all the specifications stated below. 1. All double-acting actuators shall be of the balanced scotch-yoke design and be capable of producing a torque output at both the start and end positions (0 and 90 degrees) of at least 1 1/2 times the minimum torque output. Spring-return actuators shall be of the balanced scotch-yoke design (i.e., air ending and spring ending as well as air start and spring start shall have comparable...

ORDERING / MODEL DESIGNATION Spring-Return Example HD Double-Acting Example Actuator fail mode (cw or ccw) Type of manual override (e.g., manual override jackscrew with handwheel) Extended travel stop (full 0° to 90°) Spring Return (e.g., 80 PSIG nominal operating pressure) Temperature trim (e.g., high temp) Working pistons Number of working pistons (1 or 2) Nominal moment arm (e.g., 3.0 inches) Nominal cylinder size (inches) Heavy Duty Series Nominal moment arm size (2.0 inches) Nominal C.V.L. (e.g., 5.0 inches) Heavy Duty Series OPTIONAL ACCESSORIES Bettisystems™ Bettis has pre-engineered...