Emerson 289HH Installation Manual - Page 2
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289 Series
AVAILABLE
BODY SIZE,
CONFIGURATION
Type 289A
Type 289H
Type 289HH
Type 289L
3/4 or 1
Type 289U
1. This value indicates the relief pressure setting plus pressure build-up.
It is important that the backpressure
regulator be installed so that the vent hole in
the spring case is unobstructed at all times.
For outdoor installations, the backpressure
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 backpressure regulator beneath
eaves or downspouts, and be sure it is above
the probable snow level.
For installation of Types 289H, 289HH and 289L
backpressure regulators, the vent in the spring case must
remain plugged or undrilled in order for the pitot tube to
function properly.
Overpressure
Maximum inlet pressures depend upon body materials
and temperatures. Refer to the nameplate for the
maximum inlet pressure of the valve. The valve should be
inspected for damage after any overpressure condition.
Fisher™ backpressure regulators are NOT ASME
safety relief valves.
Startup
The backpressure 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 (if applicable).
Adjustment
To change the outlet pressure, remove 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 closing cap or tighten the
locknut to maintain the desired setting.
2
Table 1. Maximum Allowable Relief (Inlet) Pressure
COLOR
NPT
CODE
Silver
1/4
Silver
Pink
Red
1
Silver
Green
Dark blue
Gray
2
Dark green
Red Stripe
1
Green
Silver
Red Stripe
Silver
1/4
Silver
Note
SPRING RANGE
(RELIEF PRESSURE SETTINGS)
bar
psig
0.21 to 0.90
3 to 13
0.76 to 1.5
11 to 22
0.07 to 0.31
1 to 4.5
0.28 to 1.0
4 to 15
0.69 to 1.4
10 to 20
1.0 to 3.5
15 to 50
17 to 45 mbar
7 to 18 in. w.c.
0.03 to 0.16
0.5 to 2.25
0.12 to 0.48
1.75 to 7
0.28 to 0.69
4 to 10
3.1 to 5.2
45 to 75
25 to 45 mbar
10 to 18 in. w.c.
30 to 99 mbar
12 to 40 in. w.c
12 to 62 mbar
5 to 25 in. w.c.
50 to 207 mbar
20 in. w.c. to 3 psig
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.
For the 2 NPT Type 289H backpressure regulators,
when changing from one spring range to another, it is
recommended that a new spring case be used so that the
travel stop drive screw will be positioned correctly for the
corresponding spring range.
Parts List
Key
Description
1
Valve Body
2
Spring Case/Spring Case Assembly
3
Diaphragm Head
4
Spring Seat
5*
Diaphragm/Diaphragm Assembly
6
Adjusting Screw
7
Spring
8
Machine Screw, Plated steel
9
Screen, Stainless steel
10*
Orifice
11
Hex Nut
13
Snap Ring
14
Closing Cap
15*
Gasket, Neoprene (CR)
17
Lower Spring Seat, Zinc-plated steel
18
Pitot Tube
19*
Gasket, Composition
20*
O-ring
21
O-ring Holder, Aluminum
22
O-ring Washer
23
Spacer
24
Hex Nut, Plated steel
26
Lower Diaphragm Head, Zinc-plated steel
27
Washer, Aluminum
28
Pipe Plug, Types 289H and 289HH, Carbon steel
29
Machine Screw, Carbon-plated steel (not shown)
30*
O-ring, Types 289H and 289HH
31
Stem Guide Assembly
32
Lifting Lever (not shown), Steel
34*
Diaphragm Protector (not shown),
Polytetrafluoroethylene (PTFE) Types 289A
38*
Gasket, Type 289H, 2 NPT body, Neoprene (CR)
MAXIMUM ALLOWABLE RELIEF
(INLET) PRESSURE
(1)
bar
psig
3.1
45
6.9
100
1.7
25
6.9
100
0.48
7
0.69
10