Emerson Fisher SS-263 User manual

www.Fisher.com
Fisher™SS-263 Volume Booster
Contents
Introduction 1.................................
Scope of Manual 1.............................
Description 1.................................
Educational Services 2.........................
Specifications 2................................
Installation 3..................................
Mounting 5..................................
Pressure Connections 5........................
Supply Pressure 5.............................
Exhaust Passages 6............................
Operating Information 6.........................
Principle of Operation 6.........................
Maintenance 6.................................
Diaphragm Assembly Replacement 7.............
Valve Assembly Replacement 8..................
Parts Ordering 9................................
Parts Kits 12...................................
Parts List 12...................................
Figure 1. Fisher SS-263 Volume Booster
X0206
Introduction
Scope of Manual
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 being fully trained and qualified in valve,
actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is
important to carefully read, understand, and follow all the contents of this manual, including all safety cautions and
warnings. If you have any questions about these instructions, contact your Emerson sales office before proceeding.
Description
The SS-263 volume booster is used exclusively in Fisher Optimized Digital Valve (ODV) packages. 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.
Instruction Manual
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SS-263 Volume Booster
September 2019

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Table 1. Specifications
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(1)
Maximum pressure must not exceed 10.3 bar
(150 psig)
Operative Temperature Limits(1)
-40 to 71_C (-40 to 160_F)
Maximum Flow Coefficients
Supply: 9.5 Cv
Exhaust: 9.5 Cv
C1: 35
Xt: .77
Connections
Input Signal: 1/4 NPT
Supply: 1 NPT
Output: 1 NPT or 1-1/4 NPT(2)
Hazardous Area Classification
Complies with the requirements of ATEX Group II
Category 2 Gas and Dust
Ex h IIC Tx Gb
Ex h IIIC Tx Db
Maximum surface temperature depends on operating
conditions
Gas: T6...T2
Dust: T85...T208
Declaration of SEP
Fisher Controls International LLC declares this
product to be in compliance with Article 4 paragraph
3 of the PED Directive 2014 / 68 / EU. It was designed
and manufactured in accordance with Sound
Engineering Practice (SEP) and cannot bear the CE
marking related to PED compliance.
However, the product may bear the CE marking to
indicate compliance with other applicable European
Community Directives.
Approximate Weight
Aluminum: 3.6 kg (8 lbs)
Stainless Steel: 10.8 kg (24 lbs)
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.
2. Consult factory for additional sizes.
Educational Services
For information on available courses for Fisher SS-263 volume booster, as well as a variety of other products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: [phone] or 1-800-338-8158
E-mail: [email protected]
emerson.com/fishervalvetraining
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).

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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.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Note
Do not use separate pressure supplies for the volume booster and associated positioner.
The volume booster may not exhaust immediately upon loss of a separate pressure supply. However, if the system is in a transient
state at the time of pressure supply loss or if changes to the booster's input signal are sufficient to overcome the deadband, the
booster will exhaust.
A highcapacity regulator is required to provide sufficient capacity to supply both components. A highcapacity filter
should be installed in the supply line to the regulator.

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Figure 3. Volume Booster Sectional View
BYPASS RESTRICTION
ADJUSTING SCREW
SUPPLY PORT
OUTPUT TO
ACTUATOR
BYPASS RESTRICTION
INPUT SIGNAL
SUPPLY
DIAPHRAGM
ASSEMBLY
EXHAUST
PASSAGES INPUT DIAPHRAGM
FEEDBACK DIAPHRAGM
NOISE
ATTENUATING TRIM
3 IN 1 CONNECTION
X0206
MOUNTING
ADAPTOR
AUXILIARY
SUPPLY
CONNECTION
(QTY 2)

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Mounting
The volume booster is mounted to the actuator using the provided mounting adaptor (figure 3) that attaches to the
top or bottom of the piston cylinder using a 1 NPT or 11/4 NPT connection and to the SS263 using a flangetype
connection. For mounting to an ATI piston actuator, a 11/4 NPT pipe elbow (key 34) is installed between the
mounting adaptor and piston cylinder. Mounting of the SS263 to the actuator is typically performed at the factory;
however the following instructions can be used to mount the SS263 to a Fisher 685 or ATI piston actuator.
Mounting to a Fisher 685 Piston Actuator
1. Apply a suitable thread sealant to the threads of the mounting adaptor (key 29) and thread into the appropriate
1 NPT or 11/4 NPT connection port on the actuator.
2. Install Oring (key 30) into the groove in the mounting adaptor (key 29).
3. Using studs (key 31), lock washers (key 33) and hex nuts (key 32) mount the SS263 onto the actuator. Tighten hex
nuts (key 32) to 50 ftlbs.
Mounting to an ATI Piston Actuator
1. Apply a suitable thread sealant to the threads of the 11/4 NPT pipe elbow (key 34) and thread into the appropriate
11/4 NPT connection port on the actuator.
2. Apply a suitable thread sealant to the threads of the mounting adaptor (key 29) and thread into the 11/4 NPT pipe
elbow (key 34).
3. Install Oring (key 30) into the groove in the mounting adaptor (key 29).
4. Using studs (key 31), lock washers (key 33) and hex nuts (key 32) mount the SS263 onto the actuator. Tighten hex
nuts (key 32) to 50 ftlbs.
Pressure Connections
The input signal connection is 1/4 NPT, the supply connection is 1 NPT, and the output connection is 1 NPT or 11/4
NPT depending on application. Ensure that the piping is of proper size to meet the capacity demands of the booster
and that the actuator is equipped with properly sized input connections.
The SS263 includes two 1/4 NPT auxiliary supply connections that allow additional accessories, such as a Fisher 377
trip valve, to be connected to supply pressure. The 3 in 1 connection provides either a 1/4 NPT diagnostic connection,
1/4 NPT actuator bypass assembly connection (for use on an actuator with a handwheel), or a 3/4 NPT dump valve
connection. Consult the appropriate actuator instruction manual for the assembly of the actuator bypass connection.
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.

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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.
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.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.

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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 two 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 outside diameter 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).
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).

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Valve Assembly Replacement
For key numbers refer to figures 5 and 6.
Figure 5. Valve Assembly Drawing
APPLY LUB/SEALANT
APPLY THREAD LOCKING ADHESIVE (MILD STRENGTH) TO
THREAD WHEN REPLACING INDIVIDUAL COMPONENTS
GE476000-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. Unscrew the valve assembly (key 5) from the body, using the 2-inch hex located on the seat ring (key 5A).
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 (key 5E). 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.
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.

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14. Apply lubricant (key 18) to the O-ring (4H) and the outside diameter 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 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 volume booster nameplate as shown in figure 2.
When ordering replacement parts, 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 Automation Solutions should
not, under any circumstances, be used in any Fisher instrument, because they may void your warranty, might adversely
affect the performance of the valve, and could cause personal injury and property damage.

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Figure 6. Volume Booster Assembly Drawing
APPLY LUB/SEALANT
GE49000-A

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Figure 7. Volume Booster Assembly with Mounting Adaptor
GE56173-A

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Parts Kits
Table 2. Parts Kits
Description Key Number Included in Kit Part Number
Diaphragm Assembly Kit (key 4) 4A, 4B, 4C, 4D (qty 2), 4E, 4F, 4H, 4J (qty 2) RSS263X0012
O-Ring Kit 5D, 5H, 9, 22 (qty 2), 30 RSS263X0022
Parts List
(figures 4, 5, 6, and 7)
Note
For part numbers not shown, contact your Emerson 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 see parts kit
4A Orifice see parts kit
4B Lower Diaphragm see parts kit
4C Upper Diaphragm see parts kit
4D Diaphragm Plate (2 req'd) see parts kit
4E Exhaust Diffuser see parts kit
4F Spring Seat see parts kit
4H O-ring see parts kit
4J O-ring (2 req'd) see parts kit
5* Valve Assembly, Brass/Nitrile GE47600X012
5A Seat Ring
5B* Lower Valve and Stem Assembly GE47594X012
5C* Upper Valve 1V198470972
Key Description Part Number
5D* O-Ring see parts kit
5E Flange Hex Nut
5F Lower Guide
5H* O-Ring see parts kit
5J Lower Spring
6 Upper Spring
7 Restriction
8 Hex Nut
9* O-Ring see parts kit
10 Cap Screw
15 Nameplate
16 Drivescrew
17 Sealant, anti-seize
18 Lubricant, silicone based
21 Pipe Plug
22* O-Ring see parts kit
28 Hex Pipe Bushing
29 Mounting Adaptor
30* Oring see parts kit
31 Stud (2 req’d)
32 Hex Nut (2 req’d)
33 Lock Washer (2 req’d)
34 11/4 NPT Pipe Elbow
*Recommended spare parts
Emerson Automation Solutions
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
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.
E2011, 2019 Fisher Controls International LLC. All rights reserved.
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Neither Emerson, Emerson Automation Solutions, 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.