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I & M JBPH Series
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
lowfl [email protected] • www.lowfl owvalve.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 qualifi ed service person;
continued operation may cause system failure or a general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized fl uid.
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
Installation & Maintenance Instructions for
JBPH Series Back Pressure Regulators
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 fl ow 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 (6) vertical upwards.
8. Regulators are not to be buried underground.
9. For insulated piping systems, recommendation is to not insulate
regulator.
JBPH
Figure 1
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.
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.
3. An inlet pressure gauge should be located approximately ten pipe
diameters upstream, and within sight. If you have ordered your JBPH
Principles of Operation
1. Movement occurs as pressure variations register on the piston
(17). The registering pressure is the inlet, P1, or upstream pressure. The range spring (3) opposes piston (17) movement. As
inlet pressure rises, the piston (17) pushes up against the spring
(3) opening the port; as inlet pressure decreases, the range spring
(3) pushes down and the port opening closes.
2. A complete piston seal (9,11) 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 (3) by turning the adjusting knob (6) 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 (6) clockwise (CW) until
fl ow begins.
6. Develop system fl ow to a level near its expected normal rate, and
reset the regulator set point by turning the adjusting knob (6) CW
to increase inlet pressure, or CCW to reduce inlet pressure.
7. Reduce system fl ow to a minimum level and observe set point. Inlet
pressure will rise from the set point of Step 6.
B. Trim Replacement
1. Remove adjusting screw assembly (6) completely out of the spring
housing (5).
2. Clamp the valve in a vise using the body (1).
3. Remove the SHCS (13) then lift off spring housing (5).
4. Remove range spring (3) and upper spring guide (4).
5. Remove piston assembly ( (7), (16), (17), and (18)). Remove
cylinder face seal (10) and discard. Note: the return spring (19) and
seals (9) and (11) are enclosed inside this assembly. See Figure 2.
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 determined safe to do so.
2. Always follow local or company procedures for removal, handling,
cleaning and disposal of non-reuseable parts, i.e. o-rings, etc.
Figure 2
6. Refer to Figure 2. Place the piston assembly into a vise with the
plug (18) pointing upward. Unscrew the plug holder (16) from the
piston (17) using a ¾” deep-welled socket. Caution: The return
spring (19) is captured between the piston (17) and plug/plug
holder (18/16). Take special care while disassembling the parts to
prevent injury from the release of the plug holder (16) and return
spring (19). Discard the old cylinder seals (9)(11) and replace with
new ones (lubricate lightly with Krytox lubricant). Reassemble the
piston assembly. Install new cylinder face seal (10) into bottom of
cylinder (7) (lubricate lightly with Krytox lubricant).
7. Place the body (1) back in the vise right side up. Place piston assembly back in body (1), taking special care to guide the plug (18)
into the bore hole in the body (1).
8. Place range spring (3) on top of piston assembly. Place upper
spring guide (4) on top of spring (18).
9. Place spring housing (5) on top of body (1). Thread SHCS (13) into
body hand tight. Cross tighten to 200 in lbs.
10. Thread adjusting knob (6) into spring housing (5)
11. Invert the body and remove the bottom cap (2) from body (1).
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12. Remove seat assembly (14)(15) from body (1) and discard.
13. Inspect all parts for damage and replace if necessary. Remove and
replace bottom cap seals (8)(12) (lubricate lightly with Krytox lubricant). Replace seat assembly (14) and insert the bottom cap (2) back
into the body (1). Note: Use only parts manufactured and supplied
by LowFlow Valve for these parts.
Troubleshooting
1. Erratic Operation; Chattering
• Oversize regulator; inadequate rangeability
- Check actuator fl ow conditions, re-size regulator for mini
mum and maximum fl ow.
- Increase fl ow rate.
- Install next step higher range spring. Before replacing
regulator, contact factory
• Worn plug or seat; inadequate guiding
- Replace trim (possible body replacement)
• Valve is stuck in position.
- Determine if corrosion is causing piston assembly/ plug to
not move freely. Clean or replace parts as necessary.
2. Regulator can’t pass suffi cient fl ow
• Regulator not closing tightly
- Inspect seat assembly and plug; replace if worn.
• Downstream blockage
- Check system; isolate (block fl ow at regulator inlet- not
outlet).
- Relocate regulator if necessary
• No pressure relief protection
- Install safety relief valve, or rupture disc.
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Cross Section View
Item
Description Quan-
No.
1 Body 1
2 Bottom Cap 1
3 Range Spring 1
4 Upper Spring Guide 1
5 Spring Housing 1
6 Knob Assembly 1
7 Cylinder 1
8 O-Ring, -119 1
9 O-Ring, 2.62 X 15.5
Metric
10 O-Ring, -129 1
11 Back-Up Ring, -114 1
12 Back-Up Ring, -119 1
13 SHCS 5/16-18X1” 8
14 Seat Holder 1
15 Soft Seat 1
16 Plug Holder 1
17 Piston 1
18 Plug 1
19 Return Spring 1
tity
1
Bulletin IM-JBPH-1014
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
lowfl [email protected] • www.lowfl owvalve.com
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