FISHER™ SS-263 Flow Amplifier

The FISHER SS¬263 volume booster is used in conjunction with FISHER control valves with double-acting piston actuators. Large piston actuators require proportionally larger volumes of air to stroke; typical valve positioner output cannot usually provide enough of a volume of air to quickly and fully stroke actuators such as these. The SS¬263 volume booster solves this by amplifying the output from the valve positioner to increase actuator stroking speed. The dual-ported design of the booster amplifies both the supply and exhaust flow, which are both precisely controlled by means of a pneumatic signal from the valve positioner.

Main Features

Fast Response – The SS¬263 delivers high¬volume output for fast stroking speeds when responding to large input signal changes and low¬volume output when responding to small input changes.
High Capacity – Flow capacities of roughly three times higher than the 2625 booster result in the need for fewer fittings, tubing, and units.
Noise Attenuation – Exhaust is passed through specially designed passages to reduce the amount of ambient noise that is generated.
Adjustable Response – The integral bypass restriction allows the booster to be easily and readily tuned to operate under small or large input signal changes.
• Auxiliary Supply Connections – Supply air is readily available through two 1/4 NPT connections that are built into both sides of the unit for use with a FISHER 377 trip valve or other accessory.
3 in 1 Connection – This special connection can provide any of the following connections, if needed.

- 1/4 NPT diagnostic connection for easy testing - 1/4 NPT actuator bypass assembly connection for use on an actuator with a handwheel - 3/4 NPT connection, with the removal of a bushing, for use with a high capacity dump valve

Soft Seated Construction ¬ Soft seated exhaust and supply valves provide for bubble tight shutoff to reduce unnecessary air consumption and ensure fail mode upon loss of plant air.
Robust Mounting – Flanged-style actuator mounting provides ease of maintenance, simplified tubing, compactness, and high vibration resistance.