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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. 
FISHER™ SS-263 Flow Amplifier
Specifications
  • Port diameter

Supply port: 19 mm (0.75 inches)
Exhaust port: 19 mm (0.75 inch)

  • Input signal: Positioner output
  • Maximum input signal pressure: 10.3 bar (150 psig)
  • Input/output pressure ratio: fixed at 1 to 1
  • Supply pressure range: Maximum pressure must not exceed 10.3 bar (150 psig).
  • Operating temperature: -40 to 71 C (-40 to 160 F)
  • Maximum flow coefficient 

Supply: 9.5 Cv Exhaust: 9.5 Cv

  •  Connection

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 

  • Approximate weight

Aluminum: 3.6 kg (8 lb)
Stainless steel: 10.8 kg (24 lb)

  • Other configurations

Contact us for more information.

Applications

Used in conjunction with a positioner on a throttling control valve to increase stroking speed.