A Series End Cap Options
Adjustable Cushion
* See Caution Note below
Cushions are designed to provide smooth deceleration, external energy absorption and noise reduction, over the last 15° of rotation.
Cushions trap air at the end of stroke by blocking or restricting the discharge port. The trapped air is diverted through a small needle valve which generates a back pressure on the discharge side of the piston.
This back pressure resists the forces exerted on the internal parts of the rotary actuator, thus causing a slowing of the external mass.
Stroke adjustors are screw-type adjustable stops at end of rotation. They should be used when the exact final position of rotation is best determined on the assembled machinery or when final position requirements may vary with different machine set ups.
* Caution: Cushion needles should be set between one half and one full turn from seated position. Setting should result in continuous speed reduction throughout the cushion length. Needle adjustment is set too tight when there is an abrupt change in speed as the actuator enters the cushion. Never operate with needle in seated position or unscrewed beyond the point where the seal relief in the thread is visible
* Caution: Cushion needle adjustment is a crucial factor in achieving optimum cushion performance. If the needle valve setting is too far open, cushion capacity will be reduced or rendered ineffective; if set too tight, cushion action will generate shock and pressure spikes in excess of actuator rating.
NOTE: Cushions and stroke adjustors are not available on the same cylinder end cap for standard models. Consult factory for special design considerations.