Fisher™ SS-263 Volume Booster


The SS-263 volume booster is used exclusively in Fisher Optimized Digital Valve (ODV) packages.

It amplifies the output signal from the FIELDVUE™ digital valve controller to increase the stroking speed of pneumatic actuators. It can deliver high-volume output for fast stroking speeds when responding to large input signal changes or smooth, stable, low-volume output when responding to small input signal changes. This allows stable, accurate throttling control which is often necessary during the startup or commissioning of process control equipment.




Port Diameters
Supply port: 19 mm (0.75 inch)
Exhaust Port: 19 mm (0.75 inch)
Input Signal
Positioner output
Maximum Input Signal Pressure
10.3 bar (150 psig)
Input to Output Pressure Ratio
Fixed at 1 to 1
Supply Pressure Ranges
Maximum pressure must not exceed 10.3 bar (150 psig)
Operating Temperature
-40 to 71 C (-40 to 160 F)
Maximum Flow Coefficients
Supply: 9.5 Cv
Exhaust 9.5 Cv
C1: 35
Xt: 0.77
Input signal: 1/4 NPT
Supply: 1 NPT
Output: 1 or 1-1/4 NPT
Hazardous Area Classification
Complies with the requirements of ATEX Group II Category 2 Gas and Dust
Declaration of SEP
Fisher Controls International LLC declares this product to be in compliance with Article 3 paragraph 3 of the Pressure Equipment Directive (PED) 97 / 23 /EC. It was designed and manufactured in accordance with Sound Engineering Practice (SEP) and cannot
Approximate Weight
Aluminum: 3.6 kg (8 lbs)
Stainless Steel: 10.8 kg (24 lbs)
Other Configurations
Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.


  • 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 amountof 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 foruse on an actuator with a handwheel, and 3/4 NPT connection
  • Soft-Seated Construction: Soft seated exhaust and supply valves provide for bubble tight shutoff toreduce unnecessary air consumption and ensure fail mode upon loss of plant air.
  • Robust Mounting: Flanged-style actuator mounting provides ease of maintenance, simplifiedtubing, compactness, and high vibration resistance.


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