cashco 345 Manuel d'installation, d'utilisation et d'entretien - Page 2
Parcourez en ligne ou téléchargez le pdf Manuel d'installation, d'utilisation et d'entretien pour {nom_de_la_catégorie} cashco 345. cashco 345 8 pages. Pressure reducing regulator
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III. PRINCIPLE OF OPERATION
Movement occurs as pressure variations register on the pressure piston. The registering pressure is the outlet, P
or downstream pressure. The range spring opposes pressure piston movement. As outlet pres sure drops, the range
spring pushes the pressure piston down, opening the port; as outlet pres sure in creases, the pressure piston pushes
up and the port opening closes.
IV. STARTUP
1.
Start with the block valves closed. A bypass
valve may be used to maintain outlet pressure
in the downstream system without changing the
fol low ing steps.
2.
Relax the range spring by turning the T-bar handle
ad just ing screw counter clockwise (CCW) a
mini mum of three (3) full revolutions. This reduces
the outlet (downstream) pressure set point.
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
ex pan sion of the piping.
(down stream) pressure via gauge to assure not
over-pressurizing. NOTE: If no bypass valve is
in stalled, 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 serv ing the outlet (downstream) pressure
gauge. Determine if the regulator is flowing. If not,
slowly rotate the regulator T-bar ad just ing screw
handle clock wise (CW) until flow begins.
V. SHUTDOWN
1. On systems with a bypass valve, and where sys tem
pressure is to be maintained as the regulator is
shut down, slowly open the bypass valve while
closing the inlet (upstream) block valve. Fully
close the inlet (upstream) block valve. (When on
bypass, the system pressure must be constantly
observed and manually regulated.)
outlet (downstream) block valve.
2
SECTION III
SECTION IV
Closely monitor outlet
SECTION V
Close the
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.
(down stream) pressure 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 valve 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 T-bar adjusting screw handle CW to
in crease 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. The maximum rise in outlet
pres sure on decreasing flow should not exceed the
stated upper limit of the range spring by greater
than 10%; i.e. 500 to1000 psig (34.5 to 68.9 Barg)
range spring, at low flow the outlet pressure should
not exceed 1100 psig (75.8 Barg), if it does, consult
factory.
CAUTION
Do not walk away and leave a bypassed regulator
unattended!
2. If the regulator and system are to both be
shutdown, slowly close the inlet (upstream) block
valve. Close the outlet (downstream) valve only if
regulator re mov al is required.
,
2
If the outlet
IOM-345