Salt-resistant actuator can act tough in control
15 Jan 2000
Designed to give reliable, extended service in even the most arduous of operating conditions, the Figure 79 from Keystone is a range of universal, quarter-turn, compact pneumatic actuators.
The actuator body is constructed from hard anodised aluminium, externally protected by an electrostatic powder coating finish that prevents corrosion, especially in salt-laden atmospheres.
The incorporation of dual springs into the Figure 79 is said to reduce overall spring length, while increasing reliability over conventional multi-spring designs. A compact rack-and-pinion design also reduces the number of dynamic seals needed, so minimising the possibility of air leakage. Double pistons also eliminate offset side load on the piston shaft to reduce bearing wear.
According to Keystone, the design of the actuator enables the whole piston area to be used to provide a constant torque throughout the stroke, making the actuator suited to modulating control as well as conventional open/close.
Available in three models for a range of output torque up to 1519Nm, the Figure 79 can be direct mounted to both Keystone and other ISO valves. Recommended operating temperatures range from -30 degrees to 90 degreesC.
273 ON ENQUIRY CARD
