KEYSTONE PNEUMATIC ACTUATORS

Keystone Figure 79U/79E Pneumatic Actuator Models 003S to 091S

Spring Return Pneumatic
Quarter-turn Actuators (Keystone Standard or ISO 5211)
For Spring End Torques to 4,943 lb. in

Features and Benefits

* Compact rack and pinion design utilizes the whole piston area to develop output torque.

* Pistons with integral rack drive reduce the number of dynamic seals, minimizing air leakage.

* Double pistons nullify sideloads on the pinion shaft, minimizing bearing wear and extending life.

* Internal air porting eliminates external tubing.

* Hard anodized aluminum body with external electrostatic powder coating (ESPC) finish protects against corrosive environments.

* Female output drive enables direct mounting of most Keystone valves, eliminating special adaptation connections and assuring correct alignment.

* Bottom entry pinion shaft simplifies assembly and provides anti-blowout feature.

* Anti-friction piston pads ensure no metal-to-metal contact, providing smooth operation. Ideal for modulating or on/off control applications.

* Adjustable travel stops standard in both directions on models 065S and 090S.

* An extensive range of standard accessories are available for direct mounting.

• Solenoid valves
• Limit switchboxes
• Positioners
• Declutchable manual override gearbox
• High visibility indicator

General Application

For remote control of any quarter-turn application; for example, ball, butterfly or rotary plug valves, dampers, etc.

Technical Data

Maximum supply pressure: 150 psig
Rated supply pressure: 120 psig
Spring end-torque: 4,943 lb.in. @ 100 psig
Temperature range: -20°F to 210°F
(-30°C to 100°C)
Optional temperature ranges available:
-15°F to 300°F
(-26°C to 150°C)
-40°F to 160°F
(-40°C to 71°C)

Materials of Construction

   Item                        Material              US Material Standard    UK Material Standard    DIN Material Standard

 1 Body                  Extruded aluminum           ASTM B221               BS1474                  6063DIN3.33206.51(hard anodized & ESPC*)

 2 Spring housing        Die-cast aluminum           ASTM B85                BS1490                  DIN1725 - 230 or 226
                         LM6 or LM24
                         (ESPC*)

 3 Piston(003S only)     Glass filled nylon 66

   Piston(006S-090S)     Die-cast aluminum(anodized) ASTM B85                BS1490                  DIN 1725 - 230 or 226
                         LM6 or LM24

 4 Pinion shaft          Carbon steel                ASTM A108               BS970 080M40            C40
                         (sealbond - N coated)

 5 Bearings              Engineered polymer

 6 O-rings               Nitrile

 7 Fasteners              304 stainless steel         ASTM A193               BS970 Part 3 - 304/305 DIN 267 Part 3

 8 Indicator             ABS

 9 Spring                Spring steel (ESPC*)        ASTM A401               BS5216 HS3             DIN 17223 Pti

10 Spring cone           Die-cast aluminum LM6       ASTM B85                BS1490                 DIN 1725

11 Spring retaining bolt Steel(plated)

* electrostatic powder coating