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I & M JRH Series
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
low[email protected] • www.lowowvalve.com
Warning: Low Flow 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
Outlet
Supply
P1
JRR
P2
Bypass
Installation & Maintenance Instructions for
JRH Series Gas Pressure Reducing Valves
An outlet pressure gauge should be located ap-3.
proximately ten pipe diameters downstream, and
within sight. If you have ordered your JR 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.
All installations should include a downstream relief 4.
device if the inlet pressure could exceed the pressure rating of any downstream equipment or the
maximum outlet pressure rating of the unit.
Flow Direction: install so that the flow direction 5.
matches the inlet/outlet marking on the main regulator body (1).
For best performance, install in well drained horizon-6.
tal pipe.
Basic regulator - regulator may be rotated around 7.
the pipe axis 360°. Recommended position is with
knob (14) vertical upwards.
Regulators are not to be buried underground.8.
For insulated piping systems, recommendation is to 9.
not insulate regulator.
To Drain
To Drain
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.
If service application is continuous such that shut-2.
down 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
Movement occurs as pressure variations register 1.
on the diaphragm (3). The registering pressure is
the outlet, P2, or downstream pressure. The range
spring (5) opposes diaphragm (3) movement. As
outlet pressure drops, the range spring (5) pushes
the diaphragm (3) down, opening the port; as outlet pressure increases, the diaphragm (3) pushes
up and the port opening closes.
A complete diaphragm (3) failure will cause the 2.
regulator to fail open.
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Start Up
Caution! Don’t 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.
Start with the block valves closed. A bypass valve 1.
may be used to maintain outlet pressure in the
downstream system without changing the following
steps.
Relax the range spring (5) by turning the adjusting 2.
knob (14) counter-clockwise (CCW) until there is no
noticeable spring tension.
If it is a “hot” piping system, and equipped with a 3.
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.
Crack open the outlet (downstream) block valve.4.
Slowly open the inlet (upstream) block valve observ-5.
ing the outlet (downstream) pressure gauge. Determine if the regulator is flowing. If not, slowly rotate
the regulator adjusting knob (14) clockwise (CW)
until flow begins.
Continue to slowly open the inlet (upstream) block 6.
valve until fully open.
Continue to slowly open the outlet (downstream) 7.
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.
When flow is established steady enough that the 8.
outlet (downstream) block is fully open, begin to
slowly close the bypass valve if installed.
Develop system flow to a level near its expected 9.
normal rate, and reset the regulator set point by
turning the adjusting knob (14) CW to increase outlet pressure, or CCW to reduce outlet pressure.
Reduce system flow to a minimum level and observe 10.
set point. Outlet pressure will rise from the set point
of Step 9.
Shutdown
On systems with a bypass valve, and where system 1.
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.
If the regulator and system are to both be shut 2.
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
Maintenance procedures hereinafter are based 1.
upon removal of the regulator unit from the pipeline
where installed.
Owner should refer to owner’s procedures for 2.
removal, handling, cleaning and disposal of nonreuseable 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. But please note the caution above.
Make sure all upstream and downstream valves are
closed and all pressure is relieved prior to beginning
work.
Remove adjusting screw assembly (14) completely 1.
out of the spring housing (11).
If valve is removed from the line, clamp the valve in 2.
a vise using the body (1).
Remove spring housing (11).3.
Remove range spring (5) and spring seat (10).4.
Remove diaphragm assembly parts (2), (3), and 5.
(4). See Figure 1.
Inspect all parts for damage and replace if neces-6.
sary. Note: Use only parts manufactured and supplied by LowFlow Valve for these parts.
Remove seat holder (8), seat (9) and plug (7) from 7.
body (1).
Place new plug (7) into body chamber. Make sure 8.
the bottom stop rod (bigger end) of the plug (7)
goes down inside the return spring (6).
Place the new seat (9) into the seat holder (8) and 9.
carefully install into body cavity (1) taking care not
to bend the narrow rod on top of the plug (7) when
it passes through the seat holder (8).
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Refer to Figure 1. Unscrew the lower diaphragm 10.
plate (4) from the upper diaphragm plate (2). Discard the old diaphragm (3) and reassemble with
new one. Use LowFlow replacement diaphragm
only.
Figure 1: Diaphragm Subassembly
Place diaphragm assembly parts (2), (3), and (4)
back into body cavity (1), making sure the small
counterbore on the bottom of lower diaphragm plate
is properly engaged with the narrow tip of the plug
(7) which protrudes through the seat holder (8).
Replace range spring (5), spring seat (10), center-11.
ing both on top of the upper diaphragm plate (4).
Replace housing (11) and adjusting screw (14).
Even if pressure builds up beyond set up, a regulator may or may not develop bubble tight shutoff.
Pressurize with air and spray liquid leak detector 12.
around body (1) and spring housing (11) to test for
leakage. Ensure outlet pressure is maintained during
this leak test at mid-range spring level: i.e. 25-100
psig (1,7 - 6,9 barg) range spring, 60 psig (4,3 barg)
test pressure minimum.
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.
Perform Steps 1 - 5 from Section B, Trim 1.
Replacement.
Perform steps 10 - 13 from Section B, Trim 2.
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. Decrease regulator pressure drop; decrease inlet
pressure by placing a throttling orifice in inlet piping.
4. 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. Weakened/broken return spring.
1. Determine if corrosion is causing plug to not move
freely. Replace return spring.
2. Regulator can’t pass sufficient ow
A. Regulator not closing tightly
1. Inspect plug and seat 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 chamber at
temperature below free point.
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Cross Section View
14
Item No. Description Quantity
1 Body 1
2 Upper Diaphragm 1
3 Diaphragm 1
4 Lower Diaphragm Plate 1
5 Range Spring 1
6 Return Spring 1
5
10
7 Plug 1
8 Seat Holder 1
9 Seat 1
2
11
10 Spring Seat 1
11 Spring Housing 1
14 Knob 1
4
3
9
8
7
1
6
Bulletin IM-JRH-0809
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
low[email protected] • www.lowowvalve.com
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