LowFlow JBDL Series Back Pressure Valves - Manual

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowflowvalve.com
I & M JBDL Series
Installation & Maintenance Instructions for
JBDL Series Back Pressure Regulators
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 leak-
age 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 main-
tained. Spending a few minutes now reading these in-
structions 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
Refer to Figure 1.
Caution! Installation of adequate overpressure pro-
tection 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 shut-
down is not readily accomplished, it is recommend-
ed 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 JBDL 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 an 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 assembly (3) 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 (8). The registering pressure is the
inlet, P1, or upstream pressure. The range spring (4)
opposed diaphragm (8) movement. As inlet pres-
sure rises, the diaphragm (8) pushes up against the
range spring (4) opening the port. As inlet pressure
decreases, the range spring (4) pushes down and
closes the port.
2. A complete diaphragm (8) failure will cause the
regulator to fail closed.
Start Up
Caution! Do not exceed the maximum rated pressure
of the regulator if installed for a hydrostatic test. Iso-
late 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 (4) by turning the adjusting
JBDL
Figure 1.
To Drain To Drain
Supply
P1
Outlet
P2
Bypass