LowFlow JB Series Back Pressure Regulators - Manual

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowflowvalve.com
I & M JB Series
Installation & Maintenance Instructions for
JB Series Back Pressure Regulators
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 disas-
sembling 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
Preferred Installation
Caution! Installation of adequate overpressure pro-
tection is recommended to protect the regulator from
overpressure and all downstream equipment from dam-
age 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 shut-
down 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 approxi-
mately 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 pres-
sure 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 pres-
sure 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 regula-
tor body (1).
6. For best performance, install in well drained horizon-
tal 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.
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.
1 Shut off Valve
2 Pressure Gauge
3 JB Series Regulator
By-pass line
1
1 1
2
3
Main line