Cashco 31-B - Manual (Page 3)

IOM-31-B 3
SECTION IV
IV. STARTUP
1. Assure that the proper range spring is indicated
to be within the regulator by inspection of the
unit’s name plate. Apply setpoint pressures that
are only within the stated range.
2. When stating direction of rotation of the ad just-
ment screw, the view is with respect to looking
down towards the closing cap or its normal lo ca-
tion.
3. Start with the block valves closed. A bypass
valve may be used to maintain inlet pressure
in the up stream system without changing the
fol low ing steps.
4. Remove closing cap on top of upper case. Relax
the range spring by turning the adjustment screw
CCW a minimum of three (3) full rev o lu tions. This
reduces the inlet (upstream) pres sure setpoint.
5. Crack open the inlet (upstream) block valve.
6. Slowly open the outlet (downstream) block valve
ob serv ing the inlet (upstream) pressure gauge.
Partially close off the bypass valve, if open. De-
ter mine if the regulator is fl owing. If not, slowly
rotate the regulator adjustment screw CCW until
fl ow begins.
7. Continue to slowly open the outlet (downstream)
block valve until fully open.
8. Observing the inlet (upstream) pressure gauge,
rotate the adjusting screw CW slowly until the
inlet pressure begins to rise. Rotate CW until
the desired setpoint pressure is reached.
9. Continue to slowly open the inlet (upstream)
block valve. If the inlet (up stream) pres sure
exceeds the desired pressure, rotate the adjust-
ing screw CCW until the pressure decreases.
9. 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.
10. Develop system fl ow to a level near its expected
normal rate, and reset the regulator setpoint per
Section VII.
11. Reduce system fl ow to a minimum level and
observe set point. Inlet pressure will rise from the
setpoint of Step 9. (Ensure that this rise does
not exceed the stated upper limit of the range
spring by greater than 30%. If it does, consult
factory.
12. Increase fl ow to maximum level if possible.
Inlet (up stream or P
1
) pressure should fall off.
Readjust setpoint as necessary at the normal
fl ow rate.
SECTION V
V. SHUTDOWN
1. On systems with a bypass valve, and where
system pressure is to be maintained as the
reg u la tor is shut down, slowly open the bypass
valve while closing the inlet (up stream) block
valve. Fully close the inlet (up stream) block valve.
(When on bypass, the system pres sure must be
con stant ly observed and manually reg u lat ed.)
Close the outlet (downstream) block valve.
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.
WARNING
Do not walk away and leave a bypassed reg u la tor
un at tend ed.