cashco 345 Installation, Operation & Maintenance Manual

ISO Registered Company

I. DESCRIPTION AND SCOPE

The Model 345 is a diaphragm-less, heavy duty, high pressure reducing regulator used to control downstream (outlet
or P ) pres sure. Sizes are 1/2", 3/4", 1" (DN15, 20, and 25 ). With proper trim utilization, the unit is suitable for liquid
2
and gase ous service. Refer to Tech ni cal Bulletin 345-TB for design conditions and selection recommendations.
NOT FOR STEAM SERVICE.

II. INSTALLATION

1. An inlet block valve should always be installed.
2. If service application is continuous such that
shut down is not readily accomplished, it is rec-
ommended that an inlet block valve, outlet block
valve, and a manual bypass valve be installed.
3. Pipe unions should be installed to allow removal
from piping.
4. An outlet pressure gauge should be located
ap proxi mately ten pipe diameters downstream,
and within sight.
5. All installations should include a downstream
relief device if the inlet pressure could exceed the
pres sure rating of any downstream equip ment or
the maximum outlet pressure rating of the unit.
DO NOT HYDROSTATIC TEST THRU AN IN STALLED
UNIT; ISOLATE REGU LA TOR FROM TEST. Internal
me chani cal damage could re sult. Refer to Technical
Bulletin Model 345, Table 5 for "emergency over pres sure
level" that will not do irreparable dam age. In ad di tion,
note on name plate that Inlet and Outlet pres sure ratings
are at dif fer ent levels.
6. Clean the piping of all foreign material including
chips, welding scale, oil, grease and dirt
before installing the regulator.
rec om mended.
7. In placing thread sealant on pipe ends prior to
en gage ment, assure that excess material is
re moved and not allowed to enter the regulator
upon startup.
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODEL 345
PRESSURE REDUCING REGULATOR
CAUTION
Strainers are
SECTION I
SECTION II
8. Flow Direction:
match es the arrow cast on the main regulator
body.
9. Basic Regulator - (Refer to Figure 1): Regu la tor
may be rotated around the pipe axis 360
mended position is with spring chamber vertical
upwards. Orient such that the spring cham ber
vent hole does not collect rainwater or debris.
10. Regulators are not to be direct buried under ground.
Installation of adequate overpressure pro tec tion is
recommended to pro tect the reg u la tor from overpressure
and all down stream equip ment from damage in the event
of regulator failure.
For welded installations, all internal trim parts, seals and
diaphragm(s) must be removed from regulator body prior
to welding into pipelne. The heat of fusion welding will
damage non-metallic parts if not removed. NOTE: This does
not apply to units equipped with extended pipe nipples.
IOM-345
Install so the flow direction
. Rec om-
o
CAUTION
CAUTION
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