Pneumatic valve actuator M

multi-turnquarter-turnScotch yoke

Overview
The Bettis Stainless Steel M Series pneumatic actuator is engineered for reliable valve automation in aggressive and corrosive environments. Built with all-stainless-steel components, PTFE piston bearings and precision Scotch yoke mechanics, the M Series delivers long service life, reduced maintenance and secure spring handling for fail-safe operation. Typical sectors include chemical processing, power generation, water & wastewater, oil & gas and mining.

Key Features

• All-stainless-steel construction for internal and external corrosion resistance
• Scotch yoke design with precision bearings eliminates dead band and provides maximum torque at stroke ends
• 17-4 PH stainless output shaft for high torque transmission and long life
• Heat-treated stainless thrust pin and rollers reduce friction and improve torque efficiency
• PTFE piston bearings, piston rod and output shaft bushings require no lubrication and extend service intervals
• Bi-directional travel stops for accurate valve rotation adjustment
• Universal position indicator and pointer for parallel or perpendicular mounting
• Proximity switches can be direct-mounted in the actuator housing, removing need for external bracket and cam assemblies
• NAMUR drive slot for compact accessory mounting without couplings
• Available in symmetrical and canted yoke configurations to suit application requirements
• Man-safe spring-return design allows spring disarming without special tools, improving maintenance safety and reducing downtime

Specifications
Multi-turn torque: Up to 21,693 Nm (16,000 ft·lbs)
Quarter-turn torque: Up to 370,000 Nm (273,000 ft·lbs)
Linear force: Up to 2,224 kN (500,000 lbs)
Power source: Pneumatic
Product type: Pneumatic actuator
Actuation modes: Fail-safe (spring-return), Quarter-turn, Spring-return, Double-acting
Certifications: ATEX, PED (CE), SIL capable, TRCU/EAC/GOST, SHELL DEP

Technical specifications

• Construction: All stainless steel (internal and external corrosion resistance)
• Design: Scotch yoke with precision bearings (eliminates dead band; high torque at stroke ends)
• Output shaft: 17-4 PH stainless steel
• Thrust components: Heat-treated stainless steel thrust pin and rollers
• Bearings/Bushings: PTFE piston bearings, piston rod bushings, output shaft bushings (no lubrication required)
• Position indicator: Universal indicator and pointer (parallel or perpendicular mounting)
• Switch mounting: Proximity switches direct-mountable in actuator housing
• Drive slot: NAMUR drive slot for compact accessory assembly
• Configurations: Symmetrical and canted yoke options
• Spring design: Man-safe spring return with no special tools required for disarming
• Torque & force ratings: Multi-turn up to 21,693 Nm; Quarter-turn up to 370,000 Nm; Linear force up to 2,224 kN
• Power source: Pneumatic
• Actuation modes: Fail-safe (spring-return), Quarter-turn, Spring-return, Double-acting
• Certifications: ATEX, PED (CE), SIL capable, TRCU/EAC/GOST, SHELL DEP