Emerson Fisher SR8 Instruction Manual
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Emerson Fisher SR8 Instruction Manual

Sanitary backpressure regulator
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Instruction Manual
D103100X012
January 2022
Type SR8 Sanitary Backpressure Regulator
!
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or chemical contamination
causing property damage and personal
injury or death.
Fisher™ backpressure regulators must
be installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations and
Emerson Process Management Regulator
Technologies, Inc. instructions.
If a leak develops or if the outlet
continually vents liquid, service to the
unit may be required. Failure to correct
trouble could result in a hazardous
condition. Only a qualified person must
install or service the unit.
Installation, operation and maintenance
procedures performed by unqualified
personnel may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Use qualified
personnel when installing, operating
and maintaining the Type SR8 Sanitary
backpressure regulator.
Introduction
Type SR8 self-contained backpressure regulators
are suitable for pressure control of steam, liquid
or gaseous service. Typical set points range from
2 to 125 psi / 0.2 to 8.6 bar. The regulator is designed
to meet sanitary application and material requirements.
WARNING
W8967
Figure 1. Type SR8
Scope of the Manual
This manual provides installation, startup,
maintenance and parts ordering information for the
Type SR8 Sanitary Backpressure Regulator.
Type SR8

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Summary of Contents for Emerson Fisher SR8

  • Page 1 Fisher™ backpressure regulators must be installed, operated and maintained in accordance with federal, state and local codes, rules and regulations and Emerson Process Management Regulator Technologies, Inc. instructions. If a leak develops or if the outlet continually vents liquid, service to the unit may be required.

  • Page 2: Specifications

    Type SR8 Specifications The Specifications section on this page provides the ratings and other specifications for the Type SR8. The following information is stamped on the nameplate fastened on the regulator at the factory: type; body size; maximum inlet, outlet and differential pressure; maximum pressure above setpoint; maximum temperature; spring range;...
  • Page 3 Type SR8 Type SR8 July 2008 Type SR8 Sanitary Backpressure Regulator E0968 INLET PRESSURE INLET PRESSURE INLET PRESSURE OUTLET PRESSURE OUTLET PRESSURE OUTLET PRESSURE ATMOSPHERIC PRESSURE ATMOSPHERIC PRESSURE ATMOSPHERIC PRESSURE Figure 2. Operational Schematic Table 2. Set Pressure Ranges and Control Spring Data BODY SIZE SET PRESSURE RANGE WIRE DIAMETER...

  • Page 4: Installation

    Type SR8 WARNING Regulators should be installed, operated CLOSING CAP and maintained in accordance with federal, state and local codes, rules and regulations and Fisher™ instructions. ADJUSTING SCREW LOCKNUT If a leak develops in the system, it indicates service is required. SPRING CASE Failure to take the regulator out of service immediately may create a...

  • Page 5: Maintenance

    Type SR8 Table 4. Temperature Capabilities TEMPERATURE RANGE SEAT TYPE DIAPHRAGM MATERIAL O-RING MATERIAL °F °C Ethylene Propylene Diene (EPDM) EPDM -20 to 275 -28 to 135 Metal Stainless steel PTFE/Fluorocarbon (FKM) 20 to 400 -6 to 204 (Stainless steel) PTFE/Fluorocarbon (FKM) PTFE/Fluorocarbon (FKM) 20 to 400...
  • Page 6 Type SR8 1. If damage to the diaphragm or seating surface is 7. Hold wrench flats on plug (key 2), then torque hex suspected or to inspect other internal parts, loosen nut (key 16) to 6 to 8 in-lbs / 0.7 to 0.9 N•m for the locknut (key 17) or locking lever (key 22) and the 1/2 and 3/4 in.

  • Page 7: Parts Ordering

    Type SR8 Parts Ordering Description Part Number Plug O-ring When corresponding with your local Sales Office or 1/2 and 3/4 in. / 15 and 20 mm bodies sales representative about this equipment, always Elastomer diaphragms reference the equipment serial number and FS number EPDM 1H2919X0022 PTFE/Fluorocarbon (FKM)
  • Page 8 Type SR8 Description Part Number Description Part Number Diaphragm Plate Closing Cap 1, 1-1/2 and 1-1/2 x 1 in. / 1/2, 3/4, 1 and 1-1/2 in. / 25, 40 and 40 x 25 mm bodies GE02642X012 15, 20, 25 and 40 mm bodies 2 and 3 in.
  • Page 9 Type SR8 T-HANDLE OPTION VIEW A STANDARD BACKPRESSURE REGULATOR ROTATED 180° WITH ELASTOMERIC DIAPHRAGM SOFT SEAT OPTION VACUUM PROTECTION OPTION VIEW B – METAL DIAPHRAGM FOR STANDARD REGULATOR APPLY LUBRICANT (L) / SEALANT (S) L = ANTI-SEIZE LUBRICANT S1 = THREADLOCKER MEDIUM/HIGH STRENGTH SEALANT S2 = HIGH TEMPERATURE AND MEDIUM STRENGTH THREADLOCKER SEALANT 1.
  • Page 10 Type SR8 METAL DIAPHRAGM OPTION VIEW B APPLY LUBRICANT (L) / SEALANT (S) L = ANTI-SEIZE LUBRICANT S1 = THREADLOCKER MEDIUM/HIGH STRENGTH SEALANT S2 = HIGH TEMPERATURE AND MEDIUM STRENGTH THREADLOCKER SEALANT 1. Lubricant and sealant must be selected such that they meet the temperature requirements. Figure 5.
  • Page 11 Type SR8 T-HANDLE OPTION SOFT SEAT OPTION DETAIL A VACUUM PROTECTION OPTION METAL DIAPHRAGM OPTION APPLY LUBRICANT (L) / SEALANT (S) L = ANTI-SEIZE LUBRICANT S1 = THREADLOCKER MEDIUM/HIGH STRENGTH SEALANT S2 = HIGH TEMPERATURE AND MEDIUM STRENGTH THREADLOCKER SEALANT 1.
  • Page 12 Technologies, Inc. All rights reserved. 01/22. The Emerson logo is a Emerson Automation Solutions trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher™ is a mark owned by Fisher Controls International LLC, a business of Emerson Automation Solutions.

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