The RSVP 1031 actuator is designed with three modules. The first module is the center-body. We offer five different sizes of center-bodies; 26, 33, 45, 60 and 80. The second module is the power assembly. The third is the spring assembly. The power and spring assembly modules are removable, serviceable and interchangeable without removing the center-body module from the valve. This procedure does not require any special tools.

1. Body Assembly: Heavy duty modular type body allows every actuator to be made spring      return or double acting.
 
2. 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.

3. Thrust 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.
 
4. Torque Plug Seal: O-rings are located both top and bottom preventing environments from      entering the body housing.
 
5. Yoke Bearings: Located on both top and bottom of the scotch-yoke, these UHMW      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.

6. 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.
 
7. 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 1031 actuators.
 
8. Rod Bearings: These replaceable bronze SAE 660 bearings are secured between the      body and the cylinder adapter, or rod cover. The bearings are designed to minimize friction.
 
9. 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 GarlockTM gasket between the body and the adapter.
 
10. Piston: Each piston on all 1031 actuators has the option of having two piston seals on each      piston. This allows longer life in high cycle applications.
 
11. Cylinder: The cylinders are finely honed to a very low RMS finish, and then coated with      XYLANTM. This bonds to the chemically prepared surface of the steel cylinder so effectively      that unlike other coatings, cracking and flaking are virtually eliminated. This fluoropolymer      coating is highly resistant to abrasion and thermal shock providing excellent lubricity and low      friction properties. Corrosive properties of salts and other chemicals normally found in the      atmosphere or instrument air supply system will not adversely affect its performance.      Stainless Steel and AmalgonTM cylinders are also available.
 
12. Spring: Each spring is self-contained and pre-loaded in the cylinder. This prevents any      danger when the actuator is serviced and allows for field exchange of springs.