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I & M JB Series
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
lowfl[email protected] • www.lowflowvalve.com
Warning: Low Flow Back Pressure Regulators must only be used, installed and repaired in accordance with these
Installation & Maintenance Instructions. Observe all applicable public and company codes and regulations. In the
event of leakage or other malfunction, call a qualified service person; continued operation may cause system failure
or a general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized fluid. Before disassembling a valve, be sure to release all spring tension.
Please read these instructions carefully!
Your LowFlow/Jordan product will provide you with long, troublefree service if it is correctly installed and maintained. Spending a few
minutes now reading these instructions can save hours of trouble and
downtime later. When making repairs, use only genuine LowFlow Valve
parts, available for immediate shipment from the factory.
Ideal Installation
Main line
2
1
1
3
By-pass line
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Installation & Maintenance Instructions for
JB Series Back Pressure Regulators
manual bypass valve be installed.
3. An inlet pressure gauge should be located approximately ten pipe diameters upstream, and within
sight. If you have ordered your JB with inlet gauge
option on the valve body, please note that the pressure as registered on the gauge may be slightly
different than a gauge located downstream.
4. All installations should include a upstream relief
device if the inlet pressure could exceed the pressure rating of any downstream equipment or the
maximum inlet pressure rating of the unit.
5. Flow Direction: install so that the flow direction
matches the inlet/outlet marking on the main regulator body (1).
6. For best performance, install in well drained horizontal pipe.
7. Basic regulator - regulator may be rotated around
the pipe axis 360°. Recommended position is with
knob (10) vertical upwards.
8. Regulators are not to be buried underground.
9. For insulated piping systems, recommendation is to
not insulate regulator.
1 Shut off Valve
2 Pressure Gauge
3 JB Series Regulator
Preferred Installation
Caution! Installation of adequate overpressure protection is recommended to protect the regulator from
overpressure and all downstream equipment from damage in the event of regulator failure. An inlet block valve
should always be installed.
1. An inlet block valve should always be installed.
2. If service application is continuous such that shutdown is not readily accomplished, it is recommended
that an inlet block valve, outlet block valve, and a
Principles of Operation
1. Movement occurs as pressure variations register
on the diaphragm (5). The registering pressure
is the inlet, P1, or upstream pressure. The range
spring (8) opposes diaphragm (5) movement. As
inlet pressure rises, the diaphragm (5) pushes up
against the spring (8) opening the port; as inlet
pressure decreases, the range spring (8) pushes
down and closes the port.
2. A complete diaphragm (5) failure will cause the
regulator to fail closed.
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Start Up
Caution! Do not exceed the maximum rated pressure of
the regulator if installed for a hydrostatic test. Isolate the
unit if the test is above the valve rating.
1. Start with the block valves closed. A bypass valve
should be used to maintain upstream pressure in the
system without changing the following steps.
2. Relax the range spring (8) by turning the adjusting
knob (10) counter-clockwise (CCW) until there is no
noticeable spring tension.
3. Slowly open the inlet block valve. Note: if no bypass
valve is installed, extra caution should be used in
starting up a cold system; i.e. do everything slowly.
4. Slowly open the outlet (downstream) block valve.
5. Slowly rotate the regulator adjusting knob (10) clockwise (CW) until flow begins.
6. Develop system flow to a level near its expected
normal rate, and reset the regulator set point by
turning the adjusting knob (14) CW to increase inlet
pressure, or CCW to reduce inlet pressure.
7. Reduce system flow to a minimum level and observe
set point. Inlet pressure will rise from the set point of
Step 6.
Shutdown
1. On systems with a bypass valve, and where system
pressure is to be maintained as the regulator is shutdown, slowly open the bypass valve while closing
the inlet (upstream) block valve. (When on bypass,
the system pressure must be constantly observed
and manually regulated.) CAUTION! Do not walk
away and leave a bypassed regulator unattended.
2. If the regulator and system are to both be shut
down, slowly close the inlet (upstream) block valve.
Close the outlet (downstream) valve only if regulator
removal is required.
Maintenance
Warning! System Under Pressure. Prior to performing
any maintenance, isolate the regulator from the system
and relieve all pressure. Failure to do so could result in
personal injury.
A. General
1. Maintenance procedures can be done after removal of the regulator unit from the pipeline where
installed, it may be maintained in-line if it is safe to
do so.
2. 2. Always follows local or company procedures
for removal, handling, cleaning and disposal of
non-reuseable parts, i.e. gaskets, etc.
B. Trim Replacement
Note: One of the features designed into the JR valves is
that a complete trim replacement and wet side cleaning
can be done with the valve still installed, without complete disassembly. Make sure all upstream and downstream valves are closed and all pressure is relieved
prior to beginning work.
1. Remove adjusting screw assembly (10) completely
out of the spring housing (7).
2. If valve is removed from the line, clamp the valve in
a vise using the body (1).
3. Remove spring housing (7).
4. Remove range spring (8) and spring seat (9).
5. Remove diaphragm assembly parts (4), (5), and
(6). See Figure 1.
6. Inspect all parts for damage and replace if necessary. Note: Use only parts manufactured and supplied by LowFlow Valve for these parts.
7. Remove seat assembly (2) from body (1).
8. Place seat assembly (2) into body (1).
9. Refer to Figure 1. Unscrew the lower diaphragm
plate (4) from the upper diaphragm plate (6). Discard the old diaphragm (5) and reassemble with
new one. Use LowFlow replacement diaphragm
only.
Figure 1: Diaphragm Subassembly
10. Place diaphragm assembly parts (2), (3), and (4)
back into body cavity (1), making sure the small tip
on the bottom of lower diaphragm plate is properly
engaged with the seat assembly (2).
11. Replace range spring (8), spring seat (9), centering both on top of the upper diaphragm plate (6).
Replace housing (7) and adjusting screw (10).
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C. Diaphragm Replacement
Caution! To prevent damage to body, use soft
jaws when placing the body in a vise. Position
so that vise closes over the flats on lower end of
body.
1. Perform Steps 1 - 6 from Section B, Trim
Replacement.
2. Perform steps 9-11 from Section B, Trim
Replacement.
Troubleshooting
1. Erratic Operation; Chattering
A. Oversize regulator; inadequate rangeability
1. Check actuator flow conditions, re-size
regulator for minimum and maximum flow.
2. Increase flow rate.
3. Install next step higher range spring.
Before
replacing regulator, contact factory
B. Worn plug or seat; inadequate guiding
1. Replace trim (possible body replacement)
C. Valve is stuck in position.
1. Determine if corrosion is causing plug to
not move freely. Clean or replace parts as
necessary.
2. Regulator can’t pass sufficient ow
A. Regulator not closing tightly
1. Inspect tip of lower diaphragm plate (4)
and seat assembly(2), replace if worn.
B. Downstream blockage
1. Check system; isolate (block flow at
regulator inlet - not outlet.
2. Relocate regulator if necessary
C. No pressure relief protection
1. Install safety relief valve, or rupture disc.
D. Restricted diaphragm movement
1. Ensure there are no obstructions in the
vent hole of the spring housing (7), and
check for icing on the spring.
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Cross Section View
10
Item No. Description Quantity
1 Body 1
2 Seat Assembly 1
4 Lower Diaphragm Plate 1
5 Diaphragm 2
6 Upper Diaphragm Plate 1
7 Spring Housing 1
8 Spring 1
9
7
8
6
9 Spring Seat 1
10 Knob Assembly 1
13 O-Ring 1
4
13
IN OUT
1
2
5
Bulletin IM-JB-0813
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
lowfl[email protected] • www.lowflowvalve.com
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