LowFlow JRPL/JRPH Series Pressure Regulators - Manual (Page 2)

3. If it is a “hot” piping system, and equipped with a
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.
4. Crack open the outlet (downstream) block valve.
5. Slowly open the inlet (upstream) block valve ob-
serving the outlet (downstream) pressure gauge.
Determine if the regulator is flowing. If not, slowly
rotate the regulator adjusting screw (24) clockwise
(CW) until flow begins.
6. Continue to slowly open the inlet (upstream) block
valve until fully open.
7. Continue to slowly open the outlet (downstream)
block valve, especially when the downstream piping
isn’t pressurized. If the outlet (downstream) pres-
sure exceeds the desired pressure, close the block
valve and go to Step 2, then return to Step 4.
8. When flow is established steady enough that the
outlet (downstream) block is fully open, begin to
slowly close the bypass valve if installed.
9. Develop system flow to a level near its expected
normal rate, and reset the regulator set point by
turning the adjusting screw (24) CW to increase
outlet pressure, or CCW to reduce outlet pressure. .
10. Reduce system flow to a minimum level and ob-
serve set point. Outlet pressure will rise from the
set point of Step 9.
Shutdown
1. On systems with a bypass valve, and where sys-
tem 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.) Close the outlet
(downstream) block valve. CAUTION! Do not walk
away and leave a bypassed regulator unattend-
ed.
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.
-2-
Maintenance
Standard Repair Kit Parts are identified on the parts
listing by an ** after the item number. LowFlow Valve
recommends that all of these parts be replaced during
servicing.
Valve Disassembly
1. Remove adjusting knob (24).
2. Remove SHCS (16), and lift off spring housing (2).
3. Remove upper spring guide (9), range spring (12),
and lower spring guide (10).
4. Lift piston (4) and cylinder (3) out of body (1).
5. Remove piston (4) by pushing downward through
the cylinder (3).
6. Remove all o-rings (17, 27) and back up ring (19)
from the cylinder (3).
7. Remove the bottom cap (7).
8. Remove the plug (8), return spring (13), plug o-ring
(25), and plug back up ring (20).
9. Turn the body (1) upside down and remove the seat
holder (5), soft seat (6), and o-ring (18).
Valve Reassembly
1. Install the backup ring (19), and o-ring (27) into the
cylinder (3). The back up ring should be toward the
smallest I.D. Bore and the o-ring toward the largest
I.D. bore.
2. Install the piston (4) into the cylinder (3). Install the
large o-ring (17) into the groove in the bottom of
the cylinder (4).
3. Place the piston/cylinder into the body (1).
4. Place the lower spring guide (10) over the top of
the piston (4).
5. Place the range spring (12) and upper spring guide
(9) onto the lower spring guide (10).
6. Replace the spring housing (2) and thread the
SHCS (16) into the body (1).
7. Cross torque to 200 in/lbs.
8. Install the o-ring (18) onto the seat holder (5), and
the soft seat (with the red dot facing down (6) into
the seat holder. Turn body upside down and install
the seat assembly into the body (1).
9. Set the bottom cap (7) upright. Install the outer
back up ring (23), and the outer o-ring (26) onto the
O.D. of the part.
10. Install the back up ring (20), o-ring (25) onto the
plug (8). Install return spring (13).
11. Carefully install the plug (8) in the bottom cap mak-
ing sure the tail (big end) of the plug slides through
the I.D. of all the parts that have been assembled
into the bottom cap.
12. Carefully install the bottom cap assembly into
the valve making sure the top of the plug passes
through the hole in the body, and that the outer
o-ring and back up ring pass into the body bore
evenly.
13. Tighten the bottom cap (7) until a positive mechani-
cal stop is felt.
14. Thread the adjusting knob (24) into the spring
housing (2). The valve is now ready for service.