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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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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SS-263 Volume Booster
August 2011
Instruction Manual
D103542X012
Figure 3. Volume Booster Sectional View
DIAPHRAGM
ASSEMBLY
EXHAUST PORT
EXHAUST
PASSAGES
OUTPUT TO
ACTUATOR
INPUT SIGNAL
BYPASS RESTRICTION
ADJUSTING SCREW
BYPASS RESTRICTION
INPUT DIAPHRAGM
FEEDBACK DIAPHRAGM
DIAGNOSTIC PORT
SUPPLY PORT
SUPPLY
Principle of Operation
Refer to figure 3.
Because of the restriction, large input signal changes register on the booster input diaphragm sooner than in the
actuator. A large, sudden change in the input signal causes a pressure differential to exist between the input signal and
the feedback diaphragm of the booster. When this occurs, the diaphragms move to open either the supply port or the
exhaust port, whichever action is required to reduce the pressure differential. The port remains open until the
difference between the booster input and output pressures returns to within the deadband limits of the booster.
With the bypass restriction adjusted for stable operation, signals having small magnitude and rate changes pass
through the bypass restriction and into the actuator without initiating booster operation. Both the supply and exhaust
ports remain closed, allowing the output of the digital valve controller to act directly on the actuator piston.
Maintenance
WARNING
Always wear protective clothing, gloves, and eyewear when performing any maintenance procedures to avoid personal
injury.
Maintenance requires taking the volume booster out of service periodically. To avoid personal injury or equipment
damage, disconnect or bypass any pressure lines to the booster, and vent any pressure locked in the unit before you begin
maintenance.
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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
Diaphragm Assembly Replacement
CAUTION
Key numbers refer to figures 4 and 6.
Figure 4. Diaphragm Assembly Drawing
GE47590-A
1. Remove the six cap screws (key 10) from the perimeter of the spring case assembly (key 3), and lift off the
assembly, taking care you do not lose the upper spring (key 6).
2. Remove the diaphragm assembly (key 4) and diaphragm spacer assembly (key 2) as a unit. The two small O-rings
(key 22) will stay attached to the diaphragm spacer assembly (key 2).
3. Separate the diaphragm assembly (key 4) from the diaphragm spacer assembly (key 2). Inspect the upper
diaphragm (key 4C) and the lower diaphragm (key 4B) for damage and replace if necessary.
Note
The diaphragms are not individually replaceable, but must be ordered as a diaphragm assembly (key 4).
4. Replace the O-rings (key 22).
5. Carefully install the diaphragm assembly (key 4) into the diaphragm spacer assembly (key 2) by folding the upper
diaphragm (key 4C) inward. Rotate the diaphragm assembly (key 4) until the oversized hole in each diaphragm
aligns with the flow passage in the diaphragm spacer assembly (key 2).
6. Install the diaphragm assembly (key 4) and the diaphragm spacer assembly (key 2) onto the body (key 1) while
making sure the lower diaphragm (key 4B) is flat and not folded or pinched. Orient the parts to form the bypass
restriction passage as shown in figure 6.
7. Apply lubricant (key 18) to the O-ring (4H) and the OD of the spring seat (4F).
8. Install the upper spring (key 6) and the spring case assembly (key 3) on the upper diaphragm (key 4C).
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SS-263 Volume Booster
August 2011
Instruction Manual
D103542X012
CAUTION
To avoid damage to the diaphragms, do not overtighten the screws.
9. Replace the six cap screws (key 10) and tighten them in a crisscross manner using multiple patterns working up to a
final torque of 15.8 N•m (140 lbf•in).
Valve Assembly Replacement
For key numbers refer to figures 5 and 6.
Figure 5. Valve Assembly Drawing
APPLY THREAD LOCKING ADHESIVE (MILD STRENGTH) TO
THREAD WHEN REPLACING INDIVIDUAL COMPONENTS
GE476000-A
APPLY LUB/SEALANT
1. Remove the six cap screws (key 10) from the perimeter of the spring case assembly (key 3), and lift off the
assembly, taking care you do not lose the upper spring (key 6).
2. Remove the diaphragm assembly (key 4) and diaphragm spacer assembly (key 2) as a unit. The two small O-rings
(key 22) will stay attached to the diaphragm spacer assembly (key 2).
3. Unscrew the valve assembly (key 5) from the body. The seat ring (key 5A) has a 2 inch hex for removal.
4. If you are replacing a complete valve assembly (key 5), proceed to step 10.
5. If you are replacing an upper valve (key 5C) and a lower valve and stem (key 5B), loosen the hex nut (key 5E), and
remove the upper valve. Remove the hex nut. Remove the lower guide (key 5F) and the lower spring (key 5J).
Remove the lower valve and stem (key 5B) from the seat ring (key 5A).
6. Insert the replacement lower valve and stem (key 5B) into the seat ring (key 5A) and install the hex nut (key 5E) on
the stem.
7. Replace the O-ring (key 5H) and apply lubricant (key 18) to both the O-ring (key 5H) and the guide bore of the lower
guide (key 5F).
8. Install the lower spring (key 5J) and the lower guide (key 5F). Tighten to 61 N•m (45 lbf•ft).
9. Apply threadlock adhesive (mild strength) or equivalent to the threads of the lower valve and stem (key 5B) and
install the upper valve (key 5C). Tighten the hex nut (key 5E) to 4.5 N•m (40 lbf•in) with the lower surface of the
upper valve (key 5C) aligned with the upper surface of the seat ring (key 5A) as shown in figure 5.
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Instruction Manual
D103542X012
SS-263 Volume Booster
August 2011
10. Apply lubricant (key 18) to the O-ring (key 5D) and apply sealant (key 17) to the thread of the seat ring (key 5A).
11. Install the valve assembly (key 5) into the body (key 1). Torque to 102 N•m (75 lbf•ft).
12. Replace the O-rings (key 22).
13. Install the diaphragm assembly (key 4) and the diaphragm spacer assembly (key 2) onto the body (key 1) while
making sure the lower diaphragm (key 4B) is flat and not folded or pinched. Orient the parts to form the bypass
restriction passage as shown in figure 6.
14. Apply lubricant (key 18) to the O-ring (4H) and the OD of the spring seat (4F).
15. Install the upper spring (key 6) and the spring case assembly (key 3) on the upper diaphragm (key 4C).
CAUTION
To avoid damage to the diaphragms, do not overtighten the screws.
16. Replace the six cap screws (key 10) and tighten them in a crisscross manner using multiple patterns working up to a
final torque of 15.8 N•m (140 lbf•in).
Parts Ordering
Whenever corresponding with your Emerson Process Management sales office about this equipment, mention the
serial number of the valve assembly. This serial number can be found on the actuator nameplate. It may also be helpful
to mention the date and other information on the booster nameplate as shown in figure 2.
When ordering replacement parts, also state the complete eleven-digit part number of each part required as found in
the following parts list.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Process Management should
not, under any circumstances, be used in any Fisher instrument. The use of components not manufactured by Emerson
Process Management will void your warranty, might adversely affect the performance of the instrument, and could give
rise to personal injury and property damage.
Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use, or
maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and
end user.
Parts List (figures 4, 5, and 6)
Note
For part numbers not shown, contact your Emerson Process
Management sales office.
Key Description Part Number
1 Body Assembly, Aluminum
2 Diaphragm Spacer Assembly, Aluminum
3 Spring Case Assembly, Aluminum
4* Diaphragm Assembly
Aluminum / Nitrile / Nylon GE47590X012
4H* O-Ring 1U879006562
5* Valve Assembly
Brass / Nitrile GE47600X012
5B* Lower Valve and Stem Assembly GE47594X012
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SS-263 Volume Booster
August 2011
Figure 6. Volume Booster Assembly Drawing
Instruction Manual
D103542X012
APPLY LUB/SEALANT
GE47100-B
Key Description Part Number
5C* Upper Valve 1V198470972
5D* O-Ring 1H993806992
5H* O-Ring 1D191706992
5J Lower Spring GE44801X012
6 Upper Spring GE44801X012
7 Restriction
8 Hex Nut
9* O-Ring 1C854606992
Key Description Part Number
10 Cap Screw 1C8702X0022
15 Nameplate
16 Drivescrew
17 Sealant, anti-seize
18 Lubricant, silicone based
21 Pipe Plug 1C3335X0012
22* O‐Ring 14B1935X042
*Recommended spare parts
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or
maintenance of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser
and end user.
Fisher is a mark owned by one of the companies in the Emerson Process Management business division of Emerson Electric Co. Emerson Process
Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective
owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
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EFisher Controls International LLC 2011; All Rights Reserved
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