Emerson SR8 Installation Guide

Installation Guide
English – February 2006

Introduction

Type SR8

This installation guide provides instructions for
installation, startup, and adjustment. To receive a
copy of the instruction manual, contact your local

Fisher Sales Ofce or Sales Representative or view
a copy at www.emersonprocess.com/regulators. For

further information refer to:

Type SR8 instruction manual (form 5787,
D103100X012).

P.E.D. Categories

This product may be used as a pressure accessory

with pressure equipment in the following Pressure
Equipment Directive 97/23/ EC categories. It may
also be used outside of the Pressure Equipment
Directive using sound engineering practice (SEP)
per table below.

PRODUCT SIZE CATEGORIES FLUID TYPE

DN 15, 20, and 25 (1/2-inch to 1-inch) SEP

DN 40 x 25, 40, and 50

(1-1/2 x 1, 1-1/2, and 2-inch)

DN 80 (3-inch) II

I

1

Specications

Available Constructions

Type SR8: Back pressure regulator designed

for use in sanitary applications. DN 15, 20, 25,

40 x 25, 40, 50, and 80 (1/2, 3/4, 1, 1-1/2 x 1,
1-1/2, 2, and 3-inch) body sizes are suitable
for controlling steam, liquids and gasses.
End connections match up to Tri-Clamp®
sanitary ttings.

Maximum Inlet and Outlet Pressures

DN 15 to 40 (1/2 to 1-1/2-inch):

14,5 bar at 65 °C (210 psig at 150 °F)
12,4 bar at 135 °C (180 psig at 275 °F)
11 bar at 204 °C (160 psig at 400 °F)

DN 50 and 80 (2 and 3-inch):

10,3 bar at 65 °C (150 psig at 150 °F)
8,62 bar at 135 °C (125 psig at 275 °F)
7,58 bar at 204 °C (110 psig at 400 °F)

(1)

Proof Test Pressure

All Pressure Retaining Components have been
proof tested per Directive 97/23/EC - Annex 1,

Section 7.4

Set Pressure Ranges

(1)

DN 15 and 20 (1/2 and 3/4-inch): 0,2 to 0,5 bar

(2 to 8 psig), 0,4 to 1,7 bar (5 to 25 psig), 0,7 to

3,4 bar (10 to 50 psig), 2,4 to 6,9 bar (35 to

100 psig), and 5,2 to 8,6 bar (75 to 125 psig)

DN 25, 40 x 25, and 40 (1, 1-1/2 x 1, and
1-1/2-inch): 0,2 to 0,5 bar (2 to 8 psig), 0,4 to

1,7 bar (5 to 25 psig), 1,0 to 4,8 bar (15 to

70 psig), 1,7 to 6,2 bar (25 to 90 psig), 2,4
to 6,9 bar (35 to 100 psig), and 5,2 to 8,6 bar

(75 to 125 psig)

DN 50 and 80 (2 and 3-inch): 0,7 to 1,7 bar
(10 to 25 psig), 1,0 to 3,4 bar (15 to 50 psig),
1,7 to 4,1 bar (25 to 60 psig)

Temperature Capabilities

(1)

Metal Seat (316L SST)

Ethylenepropylene (EPDM) Diaphragm and O-ring:

-28 to 135 °C (-20 to 275 °F)

316L SST Diaphragm and PTFE/FKM O-ring:

-6 to 204 °C (20 to 400 °F)

PTFE/FKM Diaphragm and O-ring:

-6 to 204 °C (20 to 400 °F)

Soft Seat (PTFE/316L SST)

Ethylenepropylene (EPDM) Diaphragm and O-ring:

-28 to 65 °C (-20 to 150 °F)

316L SST Diaphragm and PTFE/FKM O-ring:

-6 to 65 °C (20 to 150 °F)

PTFE/FKM Diaphragm and O-ring:

-6 to 65 °C (20 to 150 °F)

PEEK Seat (PEEK/316L SST)

Ethylenepropylene (EPDM) Diaphragm and O-ring:

-28 to 135 °C (-20 to 275 °F)

316L SST Diaphragm and PTFE/FKM O-ring:

-6 to 204 °C (20 to 400 °F)

PTFE/FKM Diaphragm and O-ring:

-6 to 204 °C (20 to 400 °F)

1. The pressure/temperature limits in this installation guide and any applicable standard or code limitation should not be exceeded.

www.emersonprocess.com/regulators

D103100XENG

2

Type SR8

Installation

Only qualied personnel should install

or service a backpressure regulator.
Backpressure regulators should be
installed, operated, and maintained
in accordance with international and
applicable codes and regulations, and
Fisher instructions.

If the regulator vents uid or a leak

develops in the system, it indicates that
service is required. Failure to take the
regulator out of service immediately
may create a hazardous condition.

Personal injury, equipment damage,

or leakage due to escaping uid

or bursting of pressure-containing
parts may result if this backpressure
regulator is overpressured or is
installed where service conditions
could exceed the limits given in the

Specications section, or where

conditions exceed any ratings of the
adjacent piping or piping connections.

To avoid such injury or damage,
provide pressure-relieving or pressure­limiting devices (as required by the
appropriate code, regulation, or
standard) to prevent service conditions
from exceeding limits.

Additionally, physical damage to the
backpressure regulator could result in
personal injury and property damage due

to escaping uid. To avoid such injury

and damage, install the backpressure
regulator in a safe location.

Clean out all pipelines before installation of the

backpressure regulator and check to be sure the valve
has not been damaged or has collected foreign material
during shipping. Use suitable line gaskets and approved
piping and bolting practices. Install the backpressure

regulator in desired position. However, to ensure
self-draining (from inlet to outlet) the valve should be
installed with the spring case in the upright vertical
position. The arrow on the body indicates ow direction.

Note

It is important that the backpressure
regulator be installed so that the vent
hole in the spring case is unobstructed
at all times.

Overpressure Protection

The recommended pressure limitations are stamped
on the nameplate. Fisher backpressure regulators

are NOT ASME safety backpressure regulators.
The valve should be inspected for damage after
any overpressure condition.

Startup

The backpressure regulator is factory set at
approximately the midpoint of the spring range or the

set pressure requested, so an initial adjustment may
be required to give the desired results. With proper
installation completed, slowly open the upstream and
downstream shutoff valves.

Adjustment

To change the pressure setting, remove the closing
cap or loosen the locknut and turn the adjusting

screw or handwheel clockwise to increase pressure
or counterclockwise to decrease pressure.
Monitor the pressure with a test gauge during the

adjustment. Replace the closing cap or tighten the
locknut to maintain the desired setting.

Pressure Loaded Construction

The spring case can be pressure loaded to adjust
set pressure. An optional tapped spring case, guide

ring seal, and sealing washer on the adjusting
screw must be used for these applications. The
loading pressure is connected to the 1/4-inch NPT
connection in the spring case allowing registration

on the spring side of the diaphragm. Adjusting

loading pressure will proportionally change the

pressure setting of the regulator. A small amount of
mechanical spring load, in addition to the pressure
load, is recommended. Regulator set pressure
achieved from the combination of spring load and
pressure load should not exceed the set pressure
ranges listed on page 1.

Taking Out of Service (Shutdown)

To avoid personal injury resulting
from sudden release of pressure,
isolate the backpressure regulator
from all pressure before attempting
disassembly. Relieve all spring
compression and isolate regulator
from the pressurized system prior to
removing the clamp (key 15, Figure 1).

Type SR8

6

7

6

9

14

15

1

T-HANDLE OPTION

STANDARD BACKPRESSURE REGULATOR

WITH ELASTOMERIC DIAPHRAGM

VIEW B – METAL DIAPHRAGM STANDARD REGULATOR

Parts List

Key Description

1 Body

2 Plug (metal seat)
3 Plug O-Ring
4 Diaphragm Plate O-Ring
5 Piston Ring

6 Diaphragm Gasket
7 Diaphragm

8 Lower Spring Seat
9 Guide Ring
10 Diaphragm Plate

11 Upper Spring Seat
12 Spring
13 Inner Spring

VACUUM PROTECTION OPTION

SOFT SEAT OPTION

Figure 1. Type SR8 Sanitary Regulator Assembly Drawing

Key Description

14 Spring Case
15 Bolted Clamp

16 Hex Nut
17 Hex Nut

18 Adjusting Screw
19 Closing Cap

22 Locking Lever

23 Flat Washer
24 Lock Washer
26 Upper Plug
27 Lower Plug

28 Soft Seat

3

Type SR8

Industrial

USA - Headquarters

McKinney, Texas 75070 USA

Tel: [phone]
Outside U.S. 1-469-293-4201

Asia-Pacic
Shanghai, China 201206
Tel: [phone]

Europe
Bologna, Italy 40013

Tel: [phone]

For further information visit www.emersonprocess.com/regulators

The Emerson logo is a 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, Inc.,
a business of Emerson Process Management.

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. We reserve the right to modify or improve the designs or specications

of such products at any time without notice.

Emerson Process Management does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any
Emerson Process Management product remains solely with the purchaser.

©Fisher Controls International, Inc., 2004, 2006; All Rights Reserved

Natural Gas Technologies

USA - Headquarters

McKinney, Texas 75070

Tel: [phone]
Outside U.S. 1-469-293-4201

Asia-Pacic

Singapore, Singapore 128461
Tel: [phone]

Europe
Bologna, Italy 40013

Tel: [phone]

Gallardon, France 28320
Tel: [phone]

Industrial/High Purity

TESCOM

Elk River, Minnesota 55330 USA

Tel: [phone]
Selmsdorf, Germany 23923
Tel: [phone]