Stream-Flo’s SPDA and SPDA-T pneumatic diaphragm actuators are designed for reliability and precision. To further enhance their functionality, we offer a comprehensive range of accessories. Our accessories are designed to meet the diverse needs of our customers, ensuring that your actuation systems perform optimally, regardless of the operational environment.
The Stream-Flo manual override accessory is used to open a reverse acting gate valve when pneumatic pressure is unavailable to operate the SPDA actuator. It is threaded to the SPDA upper plug and uses a high thrust bearing to reduce the friction due to the high thrust.
For higher thrust loads, a hydraulic override is available to operate the reverse acting gate valve in the absence of pneumatic pressure. The hydraulic override accessory can be operated using a portable hydraulic pump for simplified
field operation.
A fusible hydraulic override option is available that provides an automatic fail-safe activation of the gate valve during a fire incident. Elevated temperatures (multiple service temperature ratings are available) near the device during a fire incident will subsequently melt the fusible plug in the fusible valve allowing the normal actuator forces to move the gate valve into a fail-safe position.
The Stream-Flo manual lock open device is used to hold a reverse acting gate valve in the fully open position when pneumatic pressure is unavailable to hold open the SPDA actuator. The device is threaded to the actuator’s upper plug.
A fusible manual lock open cap assembly option is available that provides an automatic fail-safe activation of the gate valve during a fire incident.
Elevated temperatures, above 350°F, near the device during a fire incident will serve to melt the fusible plug allowing the normal actuator forces to move the gate valve into a fail-safe position. It is designed and validated according to API 6A latest edition.
The transparent stem protector is designed to shield the actuator’s stem against damage that may negatively
impact the integrity of the stem seal. The stem protector is made of a clear acrylic material to provide a visual reference to help in determining the position of the valve’s gate.
Open and closed position marks may be scribed in, or the user can use the provided position labels and place them onto the stem protector housing to provide a quick position reference point.
The Stream-Flo proximity switch assembly is used to electronically monitor the valve position, open or closed. The assembly is designed to mount standard barrel-style limit switches with fine position adjustments to fit a large range of SPDA strokes.
Depending on the selected limit switch technology, either a ferrous or magnetic target is mounted to a holder on the actuator’s rising stem to trigger the limit switches. The assembly includes a side slot with a threaded element to the trigger mount to serve as a visual indicator for the open and closed positions.
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