Fisher 912 Operating Manual
Installation Guide
English – May 2002
912 Series
Introduction
This installation guide provides instructions for installation,
startup, and adjustment. To receive a copy of the instruction
manual, contact your local Fisher Sales
Office or Sales Representative or view a copy at
www.FISHERregulators.com. For further information refer to:
912 Series Instruction Manual (form 5124, D100317X012).
P.E.D. Category
This product may be used as a safety 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.
EZISTCUDORPSEIROGETACEPYTDIULF
)hcni-4/1(6NDPES1
Specifications
Body Sizes and End Connection Styles
Inlet: DN 6 (1/4-inch) NPT screwed
Outlet: DN 6 or DN 10 (1/4 or 3/8-inch) NPT screwed
Maximum Allowable Inlet Pressure
17 bar (250 psig)
Outlet Pressure Ranges
See table 1
(1)
Maximum Allowable Outlet Pressure
Maximum Emergency Outlet Pressure: 1,4 bar
(20 psig)
Maximum Recommended Outlet Pressure to Avoid
Internal Part Damage: 0,21 bar, differential (3 psi)
above outlet pressure setting
(1)
(1)
Proof Test Pressure
All Pressure Retaining Components have been proof
tested per Directive 97/23/EC - Annex 1, Section 7.4
Temperature Capabilities
-29 to 71°C (-20 to 160°F)
(1)
Installation
Only qualified personnel should install or service
a regulator. Regulators should be installed,
operated, and maintained in accordance with
international and applicable codes and
regulations, and Fisher instructions.
If the regulator vents fluid 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.
1. The pressure/temperature limits in this installation guide and any applicable
standard or code limitation should not be exceeded.
Personal injury, equipment damage, or leakage
due to escaping fluid or bursting of pressurecontaining parts may result if this regulator is
overpressured or is installed where service
conditions could exceed the limits given in the
Specifications section, or where conditions
exceed any ratings of the adjacent piping or piping
connections.
To avoid such injury or damage, provide pressurerelieving or pressure-limiting devices (as required
by the appropriate code, regulation, or standard)
to prevent service conditions from exceeding
limits.
Additionally, physical damage to the regulator
could result in personal injury and property
damage due to escaping fluid. To avoid such injury
and damage, install the regulator in a safe
location.
Clean out all pipelines before installation of the regulator
and check to be sure the regulator has not been damaged or
has collected foreign material during shipping. For NPT
bodies, apply pipe compound to the male pipe threads. For
flanged bodies, use suitable line gaskets and approved
piping and bolting practices. Install the regulator in any
position desired, unless otherwise specified, but be sure
flow through the body is in the direction indicated by the arrow
on the body.
Note
It is important that the regulator be installed so that
the vent hole in the spring case is unobstructed at all
times. For outdoor installations, the regulator should
be located away from vehicular traffic and positioned
so that water, ice, and other foreign materials cannot
enter the spring case through the vent. Avoid placing
the regulator beneath eaves or downspouts, and be
sure it is above the probable snow level.
Overpressure Protection
The recommended pressure limitations are stamped on the
regulator nameplate. Some type of overpressure protection
is needed if the actual inlet pressure exceeds the maximum
operating outlet pressure rating. Overpressure protection
should also be provided if the regulator inlet pressure is
greater than the safe working pressure of the downstream
equipment.
Regulator operation below the maximum pressure limitations
does not preclude the possibility of damage from external
sources or debris in the line. The regulator should be inspected
for damage after any overpressure condition.
Startup
The regulator is factory set at approximately the midpoint of
the spring range or the pressure requested, so an initial
adjustment may be required to give the desired results. With
proper installation completed and relief valves properly
adjusted, slowly open the upstream and downstream shutoff
valves.
D100317XENG
www.FISHERregulators.com
912 Series
Table 1. Outlet Pressure Ranges
NOITARUGIFNOCELBALIAVA
leehwdnahtuohtiw219epyT
leehwdnahtuohtiwH219epyT
leehwdnahhtiwseireS219
EGNARERUSSERPTELTUO
)gisp/.c.wsehcni(rab
)7ot3(71ot7
)01ot5(52ot21
)31ot52.9(23ot32
)42ot21(06ot03
)5.2ot1(271ot96
)5ot7.2(043ot681
)1ot0(96ot0
)5ot0(043ot0
Adjustment
To change the outlet pressure, remove the closing cap or
loosen the locknut and turn the adjusting screw clockwise
to increase outlet pressure or counterclockwise to decrease
pressure. Monitor the outlet pressure with a test gauge
during the adjustment. Replace the closing cap or tighten
the locknut to maintain the desired setting.
Taking Out of Service (Shutdown)
To avoid personal injury resulting from sudden
release of pressure, isolate the regulator from all
pressure before attempting disassembly.
TAGNITTESERUSSERPTELTUOEVOBATNIOPETAMIXORPPA
EGRAHCSIDOTSTRATSFEILERLANRETNIHCIHW
)gisp/.c.wsehcni(rab
)12ot5(25ot21
)03ot8(57ot02
)93ot61(79ot04
)gisp3ot71(012ot24
)8.6ot7.0(74,0ot50,0
)5.21ot8.3(68,0ot62,0
)3ot0(012ot0
)5.21ot0(68,0ot0
Parts List
Key Description
1 Regulator Body
2 Spring Case
3 Closing Cap
4 Adjusting Screw
5 Regulator Spring
6 Relief Valve Spring
7 Spring Seat
8Pin
9 Relief Valve
10 Diaphragm Plate
11 Disc Holder Assembly
12 Fulcrum Rod
13 Machine Screw
14 Machine Screw
15 Diaphragm
16 Vent Screen
17 Closing Cap Gasket
BD4632-H
Figure 1. 912 Series Pressure Regulator Assembly
©Fis her C ontro ls Inte rnati onal, I nc., 2002; All R ights Rese rved
Fisher and Fisher Regulators are marks owned by Fisher Controls International, Inc. The Emerson logo is a trade mark and service mark 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. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.
For information, contact Fisher Controls, International:
Within USA (800) 588-5853 – Outside USA (972) 542-0132
France – (33) 23-733-4700
Singapore – (65) 770-8320
Mexico – (52) 57-28-0888
Printed in U.S.A.
www.FISHERregulators.com
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