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I & M JRHF Series
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
lowfl[email protected] • www.lowflowvalve.com
Warning: LowFlow 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,
trouble-free 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
Outlet
P2
Supply
P1
JRHF
Bypass
Installation & Maintenance Instructions for
JRHF Series Pressure Reducing Valves
3. An outlet pressure gauge should be located approximately ten pipe diameters downstream, and
within sight. If you have ordered your JRHF with
outlet gauge option on the valve outlet, please note
that the outlet pressure as registered on the gauge
may be slightly higher than a gauge located downstream.
4. All installations should include a downstream relief
device if the inlet pressure could exceed the pressure rating of any downstream equipment or the
maximum outlet 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 (3) vertical upwards.
8. Regulators are not to be buried underground.
9. For insulated piping systems, recommendation is to
not insulate regulator.
To Drain
Figure 1.
To Drain
Preferred Installation
Refer to Figure 1.
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.
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
manual bypass valve be installed.
Principles of Operation
1. Movement occurs as pressure variations register
on the diaphragm (8). The registering pressure is
the outlet, P2, or downstream pressure. The range
spring (4) opposes diaphragm (8) movement. As
outlet pressure drops, the range spring (4) pushes
the diaphragm (8) down, opening the port; as outlet pressure increases, the diaphragm (8) pushes
up and the port opening closes.
2. A complete diaphragm (8) failure will cause the
regulator to fail open.
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
may be used to maintain outlet pressure in the
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downstream system without changing the following
steps.
2. Relax the range spring by turning the adjusting knob
(3) counter clockwise (CCW) until there is no noticeable spring tension.
3. If it is a “hot” piping system, and equipped with a
bypass valve, slowly open the bypass valve to preheat the system piping and to allow slow expansion
of the piping. Closely monitor outlet (downstream)
pressure via gauge to ensure no over-pressurizing.
Note: if no bypass valve is installed, extra caution
should be used in starting up a cold system; i.e. do
everything slowly.
4. Crack open the outlet (downstream) block valve.
5. Slowly open the inlet (upstream) block valve observing the outlet (downstream) pressure gauge. Determine if the regulator is flowing. If not, slowly rotate
the regulator adjusting knob (3) clockwise (CW) until
flow begins.
6. Continue to slowly open the inlet (upstream) block
valve until fully open.
7. Continue to slowly open the outlet (downstream)
block valve, especially when the downstream piping
isn’t pressurized. If the outlet (downstream) pressure
exceeds the desired pressure, close the block valve
and go to Step 2, then return to Step 4.
8. When flow is established steady enough that the
outlet (downstream) block is fully open, begin to
slowly close the bypass valve if installed.
9. Develop system flow to a level near its expected
normal rate, and reset the regulator set point by
turning the adjusting knob (3) CW to increase outlet
pressure, or CCW to reduce outlet pressure.
10. Reduce system flow to a minimum level and observe
set point. Outlet pressure will rise from the set point
of Step 9.
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.) Close the outlet (downstream) block valve. 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 hereinafter are based
upon removal of the regulator unit from the pipeline
where installed.
2. Owner should refer to owner’s procedures for
removal, handling, cleaning and disposal of nonreuseable parts, i.e. gaskets, etc.
3. Refer to the basic regulator and Figure 2 for diaphragm subassembly.
Figure 2. Diaphragm Subassembly
B. Trim Replacement
Note: One of the features designed into the JRHF
valves is that a complete trim replacement and wet side
cleaning can be done with the valve still installed without complete disassembly. But please note the warning
above. Make sure all upstream and downstream valves
are closed and all pressure is relieved prior to doing
work. Use only parts supplied in a LowFlow Valve Repair
Kit.
1. Remove adjusting knob (3) by turning CCW until the
threaded portion comes out of the spring housing
(2).
2. If valve is removed from the line, place it in a vice,
spring housing up.
3. Remove the spring housing (2), the upper spring
guide (5), range spring (4), and diaphragm assembly
(6, 7, & 8).
4. Remove the diffuser (9), diffuser gasket (12), and soft
seat (10).
5. Remove the plug (11) and the return spring (13).
6. Remove the old o-ring (14) from the plug (11) and
replace it with a new one. Lubricate with anti-seize.
7. Place the new return spring (13) into the body (1),
followed by the plug (11).
8. Place the new soft seat (10) into the main body bore.
9. Place the new diffuser gasket (12) onto the diffuser
(9). Coat the threads of the diffuser (9) with an antiseize compound and thread into the body hand
tight. Using a socket wrench, tighten the diffuser (9)
1/4 turn past hand tight, taking care not to scratch
the body (1).
10. Place the new diaphragm assembly (6, 7, & 8) from
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repair kit into the body. The larger diaphragm plate
(6) should be on top.
11. Place the range spring (4) on top of the diaphragm
assembly, and the spring guide (5) on top of the
range spring (4).
12. Replace the spring housing (2) after coating the
threads with anti-seize. Tighten until the spring housing makes contact with the diaphragm (8). Tighten
1/4 - 1/2 turn past the contact point.
13. Replace the adjusting knob (3) by coating the
threads with anti-seize and threading it into the
spring housing and turning CW.
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.
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. Decrease regulator pressure drop; decrease inlet
pressure by placing a throttling orifice in inlet piping.
4. Install next step higher range spring. Before replac ing regulator, contact factory
B. Worn poppet; inadequate guiding
1. Replace trim (possible body replacement)
C. Weakened/broken return spring.
1 . D e t e r m i n e i f c o r r o s i o n i s c a u s i n g . R e p l a c e r e t u r n
spring.
1. Rotate the knob (3) CCW until it comes out of the
spring housing (2).
2. Place the valve body (1) in a vise clamping on the
flats on the bottom of the body (1).
3. Remove spring housing (2) by grasping the flats with
a wrench and turning (CCW).
4. Remove the diaphragm assembly (6, 7, & 8).
5. Disassemble the diaphragm subassembly (6, 7, & 8).
6. Clean all reusable parts according to owner’s procedures.
7. Inspect and replace any necessary parts. NOTE: Use
only parts manufactured and supplied by LowFlow
Valve for these products.
8. Reassemble diaphragm assembly (6, 7, & 8) by placing the diaphragm (8) and upper diaphragm plate
(6) over the threads of the lower diaphragm plate
(7). Tighten the assembly until the diaphragm (8) just
starts to deform using a screwdriver in the slot of
the lower diaphragm plate (7) and holding the upper
diaphragm plate (6) in a vise.
9. Place diaphragm subassembly (6, 7, & 8) onto the
body (1).
10. Place the range spring (4) on top of the diaphragm
assembly (6, 7, & 8). Place the spring seat (5) on top
of range spring (4).
11. Place the spring housing (2) over the spring seat (5)
and range spring (4). Screw the spring housing (2)
CW into the body (1). Tighten the spring housing (2)
until it makes contact with the diaphragm (8). Turn
1/4-1/2 turn past the contact point. Remove from
vise.
12. Replace the adjusting knob (3) into the spring housing (2) until range spring tension is felt.
13. Pressurize with air and spray liquid leak detector
around body (1) and spring housing (2) to test for
leakage. Ensure that an outlet pressure is maintained during this leak test of at least mid-range
spring level.
2. Regulator can’t pass sufficient flow
A. Regulator not closing tightly
1. Inspect the seat of the plug sub-assembly,
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 no moisture in spring housing at tempera ture below free point.
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Cross Section View
Item No. Description Quantity
1 Body 1
2 Housing 1
3 Knob Assembly 1
4 Spring 1
5 Spring Guide 1
6 Upper Diaphragm Plate 1
7 Lower Diaphragm Plate 1
8 Diaphragm 1
9 Diffuser 1
10 Seat 1
11 Plug 1
12 Gasket 1
13 Return Spring 1
14 O-Ring 1
Bulletin IM-JRHF-0414
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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