LowFlow JRHF Series Pressure Regulating Valves - Manual

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowflowvalve.com
I & M JRHF Series
Installation & Maintenance Instructions for
JRHF Series Pressure Reducing Valves
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 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 outlet pressure gauge should be located ap-
proximately 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 down-
stream.
4. All installations should include a downstream relief
device if the inlet pressure could exceed the pres-
sure 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 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 (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 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 out-
let 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 pres-
sure 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
Supply
P1
JRHF
Bypass
To Drain
Outlet
P2
To Drain
Figure 1.