Accessories Impact Spring Assist The Impact Spring Assist is a pneumatic device whose purpose is to increase spring closing torque on spring return actuators. This is achieved by diverting air pressure from the inner chamber to the spring chambers so that in combination with the spring force an increase in the total closing torque of the actuator will is achieved. Redirecting the air pressure into the spring chamber increases the spring end torque by 50% or more. Spring Assist Features: • Increase Actuator Spring Torque by 50% or greater • Plug & Play Easy Installation • One Size Fits All • Increase System Reliability • No External Energy Sources Required • NAMUR Interface • Includes Breather Block Feature to Protect Actuator Spring • Patent Pending Impact Spring Assist - download PDF IOM - download PDF Download Acrobat NAMUR & ISO Interface NAMUR VDI/VDE 3845 This standard provides for a range of accessories such as limit switches, pucks, indicators and positioners which have VDI/VDE interface to be easily mounted onto the actuator top face. An extensive range of accessories such as Solenoids, Positioners and Limit Switches are available for direct mounting to the COMPACT II actuator. As standard, all accessories which have connections that comply with ISO 5211 or DIN 3337 and VDI/VDE 3845 (Namur) mounting can be connected to the actuator. Dome The Dome is a weatherproof enclosure for the Compact pneumatic actuator and a variety of ancillary equipment, and represents a cost effective alternative to stainless steel actuators and all of the stainless ancillary equipment required in those applications. The Dome is ideal for very corrosive environments with frequent caustic wash-downs, as well as clean antiseptic applications where mostly stainless equipment is required. The Dome can be mounted on any quarter turn valve, Ball, Butterfly or Plug.