LowFlow JRH Series High Pressure Regulator - Manual (Page 2)

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 pre-
heat 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. Deter-
mine 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 out-
let 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 shut-
down, 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 (down-
stream) 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 non-
reuseable 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 com-
plete 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 sup-
plied 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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