Instruction Manual
D103542X012
Fisherr SS-263 Volume Booster
SS-263 Volume Booster
August 2011
Contents
Introduction 1.................................
Scope of Manual 1..............................
Description 1..................................
Specifications 2................................
Installation 2..................................
Mounting 3..................................
Pressure Connections 3........................
Supply Pressure 3.............................
Exhaust Passages 3............................
Operating Information 3.........................
Principle of Operation 4.........................
Maintenance 4.................................
Diaphragm Assembly Replacement 5.............
Valve Assembly Replacement 6..................
Parts Ordering 7................................
Parts List 7....................................
Introduction
Scope of Manual
Figure 1. Fisher SS-263 Volume Booster
This instruction manual provides installation, operation, maintenance, and parts information for the SS-263 volume
booster (figure 1). Refer to separate instruction manuals for information regarding the valve body, actuator, and other
accessories.
Do not install, operate, or maintain an SS-263 volume booster without first being fully trained and qualified in valve,
actuator and accessory installation, operation and maintenance, and carefully reading and understanding the contents
of this manual, including all safety cautions and warnings. If you have any questions regarding these instructions,
contact your Emerson Process Management sales office before proceeding.
Description
The SS-263 volume booster is used exclusively on Fisher Optimized Digital Valve (ODV) assemblies. The booster
amplifies the output signal from the FIELDVUE™ digital valve controller to increase the stroking speed of pneumatic
actuators. It has fixed deadband and incorporates soft-seat construction for use with the Fisher 377 Trip Valve.
The booster features dynamically stabilized trim and integral bypass restriction for use with the digital valve controller.
The SS-263 volume booster delivers high-volume output for fast stroking speeds when responding to large input
signal changes. However, it also delivers 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.
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SS-263 Volume Booster
August 2011
Table 1. Specifications
Instruction Manual
D103542X012
Port Diameters
Supply Pressure Ranges
Supply pressure also must not exceed the maximum
Supply Port: 19 mm (0.75 inch)
Exhaust Port: 19 mm (0.75 inch)
pressure rating of the actuator.
Up to 10.3 bar (150 psig)
Operative Temperature Limits
Input Signal
Digital valve controller output
-40 to 71_C (-40 to 160_F)
Maximum Flow Coefficients
Supply: 9.5 Cv
Exhaust: 9.5 Cv
Maximum Input Signal Pressure
10.3 bar (150 psig)
C1: 35
Xt: .77
Connections
Input Signal: 1/4 NPT
Supply and Output: 1 NPT
Input to Output Pressure Ratio
Approximate Weight
Fixed at 1 to 1
NOTE: Specialized instrument terms are defined in ANSI/ISA Standard 51.1 - Process Instrument Terminology
1. The pressure/temperature limits in this document, and any applicable code or standard limitation should not be exceeded.
Aluminum: 3.6 kg (8 pounds)
(1)
(1)
Specifications
Specifications for the SS-263 volume booster are listed in table 1. Information for an individual unit as it comes from
the factory appears on the nameplate (figure 2).
Figure 2. Example Nameplate
Installation
WARNING
Always wear protective clothing, gloves, and eyewear when performing any installation procedures to avoid personal
injury.
System damage may result if a volume booster is installed in a way that it can be physically damaged.
Personal injury or system damage may result when service conditions exceed booster or other equipment ratings.
Exceeding the pressure specifications in table 1 may cause leakage, parts damage, or personal injury due to bursting of
pressure-containing parts or explosion of accumulated gas.
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Instruction Manual
D103542X012
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
SS-263 Volume Booster
August 2011
Mounting
The volume booster is typically nipple-mounted between the pneumatic supply source and the actuator. 1 NPT
schedule 80 pipe fittings are recommended for aluminum constructions.
Pressure Connections
The input signal connection is 1/4 NPT. The supply and output connections are 1 NPT. Ensure that the piping is of
proper size to meet the capacity demands of the booster and that you equip the actuator with properly sized input
connections.
Supply Pressure
Supply pressure must be filtered clean dry air or noncorrosive gas.
WARNING
If a flammable or hazardous gas is to be used as the supply pressure medium, personal injury, property damage or
equipment damage could result from fire or explosion of accumulated gas or from contact with hazardous gas. The volume
booster has no provision for piping away the vented exhaust gas. Therefore, do not use flammable or otherwise hazardous
gas as a supply medium unless the unit is in a well-ventilated area and all ignition sources have been removed.
Exhaust Passages
Exhaust to the atmosphere is through exhaust passages located on the perimeter of the diaphragm spacer assembly.
Keep the exhaust passages free of any obstructions or foreign materials that might clog them.
Operating Information
Proper installation of the SS-263 and adjustment of the bypass restriction and tuning of the digital valve controller are
required for stable actuator performance. Installation and adjustments are typically performed at the factory.
Retain original piping configuration when replacing an SS-263 volume booster that was originally installed at the
factory.
To calibrate and tune the volume booster, turn the bypass restriction adjusting screw (figure 3) two turns
counterclockwise from the fully closed position. With the actuator in operation, slowly turn the restriction clockwise
until the booster operates in response to large changes in the input signal, yet allows small changes to move the
actuator without initiating booster operation. When additional capacity is required, multiple boosters can be used in
parallel. The minimum required adjustment for each bypass restriction adjustment screw is 1/6 turn, regardless of
configuration.
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