Owner's manual

2
IOM-1465
SECTION III
mine if the regulator is fl owing. If not, slowly rotate
the regulator adjusting screw (12) clock wise (CW)
until fl ow 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 pip ing
system isn’t pressurized. If the outlet (down stream)
pressure exceeds the desired pres sure, close the
block valve and go to Step 2, then return to Step
4.
8. When fl ow is established steady enough that the
outlet (downstream) block valve is fully open, begin
to slowly close the bypass valve if installed.
9. Develop system fl ow to a level near its expected
normal rate, and reset the regulator setpoint by
turning the ad just ing screw (12) CW to increase
outlet pressure or CCW to reduce outlet pres-
sure.
10. Reduce system fl ow to a minimum level - ob serve
setpoint. Outlet pressure will rise from the setpoint
of Step 9. The maximum rise in outlet pressure
on decreasing fl ow should not exceed the stated
upper limit of the range spring (10) by greater than
10%; i.e. 5-30 psig (.34-2.1 Barg) range spring, at
low fl ow the outlet pressure should not exceed 33
psig (2.3 Barg). If it does, consult factory.
III. PRINCIPLE OF OPERATION
1. Movement occurs when the inlet pressure pass es
by the seat causing a distributive force on the
un der side of the diaphragm. This, in turn, op-
poses the point force of the range spring caus ing
up ward movement of the di a phragm, al low ing
the plug to seat. When set pressure de creases,
due to de mand, the dis trib u tive force beneath the
dia phragm lessens - al low ing the range spring to
open the seat and regulate pres sure.
2. A complete diaphragm failure will cause the reg u-
la tor to fail open.
SEC TION IV
IV. START-UP
1. Start with the block valves closed. A bypass valve
may be used to maintain outlet pressure in the
down stream sys tem without changing the fol low-
ing steps.
2. Relax the range spring (10) by turning the ad just ing
screw (12) counter clockwise (CCW) a min i mum
of three (3) full revolutions. This re duces the outlet
(downstream) pres sure setpoint. NOTE: If the
Option -2 or -22 is utilized, the adjusting screw
(12) and locknut (13) are re placed with a knob
(18) and locknut (13). With Option -2 +80 or -22
+80, the adjusting screw (12) and locknut (13) are
replaced with a handwheel subas sem bly (20) and
locknut (13).
3. If it is a “hot” piping system, and equipped with
a bypass valve, slowly open the bypass valve
to preheat the system piping and to allow slow
ex pan sion of the piping. Ensure proper steam
trap operation if installed. Closely monitor outlet
(down stream) pressure via gauge to ensure not
over-pressurizing. NOTE: If no bypass valve is
in stalled, extra caution should be used in start ing
up a cold system; i.e. do everything slowly.
4. Crack open the outlet (downstream) block
valve.
5. Slowly open inlet (upstream) block valve ob serv ing
the outlet (downstream) pressure gauge. De ter-
9. Basic Regulator - (Refer to Figure 1): Reg u la tor
may be installed in any position in relation to the
pipe. Rec om mend ed position is with spring cham-
ber vertical upwards. Orient such that the spring
chamber vent hole does not collect rain wa ter or
debris.
10. Regulators are not to be direct buried under ground.
11. For insulated piping systems, recommendation is
to not insulate the regulator.
DO NOT HYDROSTATIC TEST THRU AN IN STALLED
UNIT; ISOLATE REG U LA TOR FROM TEST. The up per
range spring pres sure level list ed on the name plate
is the rec om mend ed "upper op er a tive limit" for the
sens ing di a phragm (see Sec tion IV. Startup, Num ber
7). High er pres sures could cause inter nal dam age.
In ad di tion, note on the name plate that the Inlet and
Outlet pres sure and tem pera ture ratings are at dif-
ferent lev els.
CAUTION D