Page 1
Instruction Manual
D102588X012
January 2018
Type 289RC Exhaust Booster
Type 289RC
Figure 1. Type 289RC Exhaust Booster
Introduction
Scope of the Manual
This manual describes the principles of operation and
provides installation instructions and a parts list for the
Type 289RC exhaust booster.
Product Description
The Type 289RC high-capacity exhaust booster
provides “release control (RC)” control pressure
to actuators, other pneumatic devices, and related
systems that require rapid response, such as surge
valves or recycle valves on compressors. This exhaust
booster is normally used on control valve actuators
to speed up the proportional operation of a control
valve in response to sudden pressure changes from
pneumatic output devices, such as solenoid valves
or pneumatic instruments. By carefully matching
the instrument and actuator performance with the
bypass valve adjustment, the Type 289RC reduces
overshoot and related problems while allowing very
fast positioning response to system requirements (i.e.,
compressor surge control). The one-way throttling
action offers superior control with exceptional stability
and the specially designed boosting system provides
high ow rates with minimum buildup.
Page 2
Type 289RC
Specications
Specications for the Type 289RC exhaust booster are listed on page 2. Specications for a given exhaust
booster as it originally comes from the factory are stamped on the nameplate.
Body Size
1 NPT
Inlet and Outlet Connections
Signal: 1/8 NPT (standard)
Outlet: 1 NPT
Maximum Pressure
(1)
Inlet: Connect to the outlet via a bypass valve,
adjustable from 0 to 0.3 Cv. (Piping is normally
congured by the customer.) See Figure 3.
(1)
Dead Band
0.5 psid / 0.034 bar d pressure across the
bypass valve
Maximum Exhaust Flow Capacity
Cv = 22. System capacity limited by the
smallest restriction between the exhaust valve
and pressure source (actuator).
Temperature Capabilities
-20 to 180°F / -29 to 82°C
100 psig / 6.9 bar
Approximate Weight
Input to Output Pressure Ratio
4 lbs / 2 kg
Fixed at 1 to 1
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Principle of Operation
bypass valve, the further the exhaust booster will
open. The booster exhaust valve closes as the
The Type 289RC 1 NPT outlet port is connected
directly to a spring return actuator and the 1/8 NPT
pressure difference between the instrument and
actuator decreases.
inlet connection on the spring case is connected to
the controlling instrument (I/P transducer, controller,
positioner, etc.). The assembly of the Type 289RC to a
control valve requires the inlet and outlet chambers be
connected via a bypass valve. The bypass valve should
be installed between the two 1/8 NPT connections on
the Type 289RC or any other convenient location per
the customer’s preference. The Type 289RC exhaust
booster has a factory set opening threshold of 0.5 psid /
0.03 bar d. The adjustment screw in the booster body
is not eld adjustable. The bypass valve is adjusted
Installation
The schematic on page 3 (Figure 2) shows the typical
Type 289RC installation. Connect the instrument
supply to the 1/8 NPT spring case inlet and the
actuator to the 1 NPT side port outlet. The inlet and
outlet must be connected via an adjustable bypass
valve. Flow through the exhaust valve must be in the
same direction as the ow arrow on the body.
on the control valve system to account for differences
in various instrument and actuator performance
characteristics. Once adjusted, the control valve
action is as described in the following paragraph.
As the output pressure of the instrument increases the
actuator moves the valve normally since the exhaust
booster cannot be actuated with an increasing signal.
Mounting is recommended with the
outlet exhaust connection pointing
down. If it is necessary to pipe this
outlet away from the area, remove the
outlet screen.
When the output pressure of the instrument decreases
the actuator will move the valve until the rate of
change of the output pressure develops 0.5 psid /
0.034 bar d across the bypass valve. When this
occurs, the pressure differential in the Type 289RC
causes the exhaust booster valve to begin opening
and begin reducing the pressure in the actuator. The
greater the differential pressure develops across the
Protect the outlet exhaust connection
against the entrance of rain, snow,
insects or any other foreign material
that may block the outlet or affect the
opening and closing of the valve.
(1)
Note
CAUTION
2
Page 3
METERED FLOW
FREE FLOW
ADJUSTABLE
BYPASS VALVE
(0 TO 0.3 C
Type 289RC
)
V
TYPE 289RC
INSTRUMENT SUPPLY
45 TO 125 psig /
3.1 TO 8.6 bar
A7208
I/P
4 TO 20 mA
Figure 2. Typical Type 289RC Exhaust Booster and Control Valve Installation
3
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Type 289RC
Operating Information
WARNING
!
Never operate this system with the
bypass valve closed.
Note
The Type 289RC requires no adjustment.
The adjusting screw (key 6) is factory set
and must not be changed.
In the operating conguration (Figure 2) the bypass
valve may require adjustment for optimum actuator
response. Always begin with the bypass valve open.
If opened enough, the instrument signal will drive the
actuator and the system will respond as if the exhaust
booster was not installed. As the bypass valve is
closed the actuator response will be faster only in
the exhaust mode. Response in the lling direction
will remain unchanged. If the control valve tends to
overshoot the desired position, the bypass valve has
been closed too far.
Maintenance
Type 289RC exhaust boosters are subject to normal
wear and should be inspected periodically. The
inspection frequency and replacement of parts
depends on the severity of the service conditions.
CAUTION
Maintenance requires taking the
exhaust booster out of service. To avoid
personal injury or equipment damage,
release or bypass any pressure in
the exhaust booster before beginning
required maintenance.
Elastomer Replacement
Key numbers refer to Figure 5.
1. Loosen the adjusting screw (key 6) and remove
the eight machine screws (key 8) from the spring
case (key 2).
2. Remove the spring case (key 2).
Calibration
The exhaust booster’s calibration is factory set. This
unit should not require calibration unless the adjusting
screw has been loosened or the spring has been
changed. Use the following procedure to calibrate a
Type 289RC exhaust booster:
1. Connect the assembled Type 289RC to two
independent pressure sources (P1 and PL) with
pressure gauges as shown in Figure 3.
2. Place a plug in the 1/8 NPT body connection.
3. Set P1 and PL at 6 psig / 0.41 bar.
4. Screw the adjusting screw in all the way.
5. Adjust PL to 5.3 psig / 0.37 bar.
6. Turn the unit upside down and put just enough
water into the exhaust port to cover the sealing
surface. Turn the adjusting screw out until the rst
bubble appears at the exhaust port.
7. Lock adjusting screw in place.
3. Remove the spring (key 7) and upper spring
seat (key 4).
4. Remove the spacer ring (key 42). The diaphragms
may stick to the spacer.
5. Remove the two machine screws (key 29) and
lift out the diaphragm/valve assembly. Lift up the
valve assembly for more screwdriver clearance.
6. Use a 7/16 in. / 11 mm wrench to remove the hex
nut (key 24). Then remove the parts in order: spring
guide (key 17), rst diaphragm head (key 43) with
curved side facing the diaphragm, diaphragm
(key 5), second diaphragm head (key 43) with
curved side facing the diaphragm, spacer (key 41),
third diaphragm head (key 43) with curved side
facing the diaphragm, second diaphragm (key 5),
stem guide (key 31), spacer (key 23), O-ring
(key 30), O-ring holder (key 21), O-ring (key 20),
O-ring holder (key 22) and O-ring (key 30).
7. Remove and discard all non-metallic parts.
8. Position the stem (key 18) to accept all parts.
Replace all non-metallic parts with new parts.
Then place parts on the stem (key 18) in reverse
order of step 6. Make sure to:
a. Lubricate all O-rings with a light coating of
silicone grease.
4
Page 5
PRESSURE
SOURCE
WITH GAUGE
Type 289RC
P
L
PRESSURE
SOURCE
WITH GAUGE
A7219
P
1
Figure 3. Type 289RC Exhaust Booster Calibration Connection
b. Assemble both diaphragms so the spring
sides (marked on diaphragm) face toward
the spring.
c. Assemble the valve seat holder and O-ring
assembly (keys 20, 21 and 22) by hand prior
to placing it on the stem.
d. Do not tighten the hex nut (24) until step 11.
PLUG FOR
TEST
EXHAUST
PORT
BUBBLE
MEASUREMENT
11. While holding the stem (key 18) through the
exhaust port in the bottom of the body, tighten
the hex nut (key 24) to 30 to 35 in-lbs / 3.4 to
3.9 N•m. Hold the diaphragm head (key 43)
while tightening the hex nut to be sure it does
not turn or move.
12. Remove the aligning machine screws (key 8).
9. Place the machine screws (key 29) in the
stem guide assembly (key 31), position the
diaphragm/valve assembly in the valve body
(key 1), and tighten screws (key 29) to 15 to
20 in-lbs / 1.7 to 2.3 N•m.
10. Position the spacer ring (key 42) between the
diaphragms and align all holes with at least three
machine screws (key 8) turned partially into
the body.
13. Place the spring (key 7) rmly around the lower
spring guide (key 17) and install the upper spring
seat (key 4).
14. Orient the spring case (key 2) as required while
carefully positioning over the spring and seat.
15. Insert and tighten the machine screws (key 8)
to 40 to 45 in-lbs / 4.5 to 5.1 N•m using a cross
tightening process.
16. Recalibrate unit using Calibration procedure on
page 4.
5
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Type 289RC
110
100
90
80
70
60
50
40
30
20
PERCENT OF CURRENT (4 TO 20 mA = 100)
PERCENT OF ACTUATOR TRAVEL (1.5 IN. / 38 mm = 100)
-0.1 -10
10
0.320 SECONDS, 85% FULL STROKE
0.1
0.2
INPUT SIGNAL
ACTUATOR TRAVEL
0.080 SECONDS OF DEAD TIME
0.3
0.4 0.5
A7218
TIME IN SECONDS
Figure 4. Typical Response Curve for Type 657 Size 45 Actuator with Type 289RC Exhaust Booster
(Using a Type 546 I/P Transducer with 4 to 20 mA input signal, 6 to 30 psig / 0.41 to 2.1 bar output and 35 psig /
2.4 bar supply pressure; a Type 657 or 645 Valve Actuator with 10 to 26 psig / 0.69 to 1.8 bar setting
and 0 to 1.5 in. / 0 to 38 mm of travel; and a Type 289RC Exhaust Booster with a bypass valve.)
Parts Ordering
When corresponding with your local Sales Ofce about
this equipment, always reference the equipment serial
number stamped on the spring case (key 2). When
ordering replacement parts, specify the complete
11-character part number of each required part as found
in the following parts list.
Parts List
Key Description Part Number
1 Valve Body, Aluminum 14B9956X012
2 Spring Case, Aluminum 2P901508012
3 Diaphragm Head, Zinc-plated carbon steel 1D666428982
4 Spring Seat, Zinc-plated carbon steel 1D667125072
5* Diaphragm, Nitrile (NBR) on nylon (2 required) 24B5622X012
6 Adjusting Screw 1D995448702
7 Spring, 302 Stainless steel 17B9737X012
8 Machine Screw (8 required) 1C856228992
9 Screen 1E564843122
11 Hex Nut 1D667728982
13 Snap Ring 13A9938X012
15* Gasket, Nitrile (NBR) 13A9929X012
16 Nameplate - - - - - - - - - - -
Key Description Part Number
17 Lower Spring Guide, Zinc-plated carbon steel 1D666625072
18 Pitot Tube or Stem, Aluminum 17B3186X012
20* O-ring, Nitrile (NBR) 1F269206992
21 O-ring Holder, Aluminum 1F826409012
22 O-ring Washer, Aluminum 1F826509012
23 Spacer 17B7490X012
24 Hex Nut 1A499724122
28 Pipe Plug T13718T0012
29 Machine Screw (2 required) 1H526928982
30 O-ring, Nitrile (NBR) (2 required) 1D687506992
31 Stem Guide Assembly, Zinc/Brass 18B0253X012
41 Spacer, Aluminum 17B3185X012
42 Spacer Ring, Aluminum 27B3187X012
43 Diaphragm Head, Zinc-plated
Carbon steel (2 required) 1P901425062
44* Screw Seal 1V205699012
45 Washer 1F826709012
46* Gasket 1F826804022
*Recommended spare part.
6
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Type 289RC
11
44
4
2
24
17
5
45
46
31
23
1
30
9
6
7
43
8
16
42
3
41
28
21
20
22
15
18
PART NOT SHOWN
MACHINE SCREW (KEY 29)
BYPASS VALVE, TUBING, AND FITTINGS
NOT SUPPLIED WITH THE TYPE 289RC EXHAUST BOOSTER
Figure 5. Type 289RC Exhaust Booster
13
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Type 289RC
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D102588X012 © 1998, 2018 Emerson Process Management Regulator
Technologies, Inc. All rights reserved. 01/18.
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