Cashco C-BPV - Manual (Page 2)

IOM-C-BPV 2
2. If the regulator and system are both to be shut-
down, slowly close the inlet (up stream) block
valve.
SECTION IV
IV. START-UP
A. General:
1. Ensure that lock-open pin (10) and quick
release pin (15) are in proper position. See
Section VII.
2. Confi rm that the proper range spring is in di -
cat ed to be within the regulator by inspection
of the unit’s nameplate. Apply setpoint pres-
sures that are only within the stated range.
3. When stating direction of rotation of the
ad just ing screw, the view is with respect to
looking down towards the spring chamber or
its normal location.
B. For systems utilizing an upstream block
valve:
1. Start with the block valve closed. A bypass
valve may be used to maintain inlet pressure
in the upstream system without chang ing the
fol low ing steps.
2a. For range springs 2 - 75 psig - Relax range
spring (7) by turning adjustment nut (6) or
handle (36) counter-clockwise (CCW) until
rotation stops. Rotate adjustment nut (6)
clockwise (CW) three (3) full revolutions to
maintain spring (7) to di a phragm-plug as-
sembly (14) contact. This reduces the inlet
(upstream) pressure set point.
2b. For range spring 60 - 125 psig - Relax range
spring (7) by turning handle (36) counter-
clockwise (CCW) until rotation stops. Rotate
handle (36) clockwise (CW) three (3) full revo-
lutions to maintain spring (7) to di a phragm-plug
assembly (14) contact. This reduces the inlet
(upstream) pressure set point.
3. Slowly open the block valve until fully open.
4. Observing the inlet (upstream) pressure
gauge, rotate the adjustment nut (6) or handle
(36) clockwise (CW) slowly until the inlet
pressure begins to rise. Rotate CW until the
desired setpoint is reached.
5. If the inlet (upstream) pressure exceeds the
desired setpoint pressure, rotate the adjust-
ment nut (6) or han dle (36) CCW until the
pressure decreases.
6. When fl ow is established steady enough that
the block valve is fully open, begin to slowly
close the bypass valve, if installed.
7. Develop system fl ow to a level near its ex-
pect ed normal rate and reset the regulator
setpoint by turning the adjustment nut (6) or
handle (36) CW to increase inlet pressure or
CCW to reduce inlet pressure.
8. Reduce system fl ow to a minimum level and
ob serve setpoint. Inlet pressure will rise from
the setpoint of Step 6. (Ensure that this rise
does not exceed the stated upper limit of
the range spring by greater than 30%, i.e.
20-60 psig (1.38-4.14 Barg) range spring, at
max i mum fl ow the inlet pressure should not
ex ceed 1.3 x 60 psig (4.14 Barg) or 78 psig
(5.4 Barg). If it does, consult the factory.)
9. Increase fl ow to maximum level, if possible.
Inlet (upstream) pressure should fall off. Re-
ad just setpoint as necessary at the normal
fl ow rate.
C. For systems not utilizing an upstream block
valve:
1. Refer to instructions B. 2a and 2b previous.
2. Closely monitor inlet (upstream) pressure,
via gauge, to ensure not over-pressurizing as
system fl ow is established. Rotate adjustment
nut (6) or handle (36) CW slowly until the inlet
pressure begins to rise to desired setpoint.
Slowly close the bypass valve, if installed.
3. If the inlet pressure exceeds the desired
set point pressure, rotate the adjustment nut
(6) or handle (36) CCW until the pres sure
decreases.
4. Follow instructions in “B”, Steps 7 thru 9.
V. SHUTDOWN
1. On systems with a bypass valve, and where sys-
tem pressure is to be maintained as the reg u la tor
is shutdown, slowly open the bypass valve while
closing the inlet (up stream) block valve. Fully
close the inlet (upstream) block valve. (When on
bypass, the system pressure must be con stant ly
observed and manually reg u lat ed.)
SECTION V
CAUTION
Do not walk away and leave a bypassed regulator unat-
tended.