AP Series Actuators - Double Action

AP Series Actuators - Double Action


There are several important considerations for evaluating actuator design and overall performance.
Among these considerations are torque output versus cost and size; effectiveness of seals, ease of mounting and adding accessories.

AP series actuators are computer designed to properly balance these criteria and to provide the alternative or combination of alternatives that best fit your particular needs.

Quality, safety, dependability and efficiency are built into every AP series actuator.


Body Assembly: Heavy duty modular type body allows every actuator to be made double acting.
Scotch-Yoke: A balanced scotch-yoke mechanism provides optimum torque output and maintenance simplicity by transforming the linear travel of the piston into a 90 degree rotating movement.
AThrust Pin & Roller: A thrust pin is secured to the piston rod and rollers are placed over the pin to allow free movement within the slot of the torque plug.
Torque Plug Seal: O-rings are located both top and bottom preventing environments from entering the body housing.
Yoke Bearings: Located on both top and bottom of the scotch-yoke, these polyethylene replaceable bearings allow the actuator to cycle more than any actuator in its class and aid in applications where the actuators are left in one position for years.
Stop Bolts with Jam Nuts: These bi-directional travel stops are an integral part of the actuator allowing 80 degree to 100 degree total travel adjustment. Internal travel stops are optional to prevent tampering.
Piston Rod: The piston rod is one continuous steel rod made of 1045 steel bar with a hard chrome plating eliminating any side load deflections. This design also allows our maximum operating pressure of 250 psig to apply to all our AP series actuators.
Rod Seals: This dynamic seal between the rod bearings and piston rod is a molythane poly-pak seal. The o-rings load the molythane lips for better low pressure sealing. As the pressure increases, the lip loading is increased, maintaining an effective seal. There is also a Garlock gasket between the body and the adapter.
Piston: Each piston on all AP series actuators has the option of having two piston seals on each piston. This allows longer life in high cycle applications.



The body configuration is computer designed to optimize the transmission of force through the piston rod to the torque plug. Sturdy bearing surfaces assure effective sealing and long life through efficient torque transmission. A thrust pin is secured to the piston rod, and a roller is placed over the pin to allow free movement within the slot of the torque plug. This acts to reduce friction and wear. The torque plug has a closed cast slot; it is not open on one end. As a result, there will be no lost motion due to open under high torques. Obviously, to obtain maximum efficiency, all tolerances are closely held.

More than economy, efficiency means dependability. For example, the journals of the torque plug provide wide bearing surfaces for ease of rotation. These also resist side thrust and wear caused by possible misalignment in mounting to a valve or damper. The piston rod slides through bronze bearings secured between the body and the cylinder adapter or rod cover. The bearing is designed to minimize friction, but the area is sufficient to counter side thrust and wear.

FB-Series Gear Operator