SPA-L Pneumatic Linear Stroke Actuators

Our Stroke Actuators convert pressure into linear movement and can be used as on-off devices or for control valve applications. They offer strong closing forces, are fast-acting, and are inherently explosion-proof. Depending on the type of model used, 5 - 7 bar (72 – 102 psi) air pressure is permissible and can be fully utilized.
Most commonly used as basic on-off devices, our linear stroke actuators are calibrated to work with a minimum air pressure of 4 bar (58 psi). At low pressures the integral spring units can be reduced also, allowing for perfect adaption of the attached valve. These spring units are automatically de-energized when the bonnet is removed. There are several actuator functions to choose from:
FC (fail closed): the valve is opened by air pressure and closed by spring force, resulting in the pre-determined final (fail closed) position.
FO (fail open): the valve is opened by spring force and closed by air pressure, resulting in the pre-determined final (fail open) position.
DA (double acting): the valve is opened and closed by air pressure, and has no defined basic position.
An optional, suitable adapter allows stroke limitation and emergency hand operation that can be combined with electrical feedback units. The flange-mount adapted unit enables the simple connection with a specific pneumatic or electro-pneumatic positioner (4-20 mA), thereby allowing full use of all control valve functions.