Cashco 5381 User Manual
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
IOM-5381
12-13
MODEL 5381
PRESSURE REDUCING SANITARY REGULATOR
SECTION I
I. DESCRIPTION AND SCOPE
Model 5381 is a pressure reducing regulator used to control downstream (outlet or P2) pressure. Inlet and outlet
size is 1/2" (DN15) with Tri-Clamp® connections. The 5381 incorporates a stainless steel body. Refer to Tech ni cal
Bulletin 5381-TB for specifi c design conditions and selection recommendations.
SECTION II
II. INSTALLATION
CAUTION
Installation of adequate overpressure pro tec tion
is recommended to pro tect the reg u la tor and
all downstream equip ment from dam age in the
event of reg u la tor failure.
1. An inlet block valve should al ways be installed
upstream of the regulator.
2. If service application is continuous such that
shut down is not readily accomplished, it is recommended that an inlet block valve, outlet block
valve, and a manual bypass valve be installed.
CAUTION
The maximum outlet pressure is list ed on the name plate as the upper range spring pres sure level, and
is the rec om mend ed “upper operative limit” for the
sens ing diaphragm (see Sec tion IV. Startup, Step
7). Higher press ures could dam age the di a phragm.
(Field hydro static tests fre quent ly destroy dia phragms. DO NOT HYDRO STATIC TEST THRU AN
IN STALLED UNIT; ISO LATE FROM TEST.)
SRV
Outlet
@ P
2
P
1
Supply
@ P
1
Blowdown-Drain
Model
5381
Bypass
Blowdown-Drain
Recommended Piping Schematic
For Pressure Reducing Station
3. An outlet pressure gauge should be located ap proxi mately ten pipe diameters downstream, and with in
sight.
4. All installations should include a downstream re lief
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.
5. Flow Direction: Install so the fl ow direction match es
the arrow stamped on the regulator body.
6. Install in well drained hori zon tal pipe, properly trapped
with spring chamber (2) in the vertical position to allow
for proper draining.
SECTION III
III. PRINCIPLE OF OPERATION
1. Movement occurs as pressure variations register on the diaphragm. The registering pressure
is the outlet, P2, or downstream pressure. The
range spring op pos es diaphragm movement. As
IV. STARTUP
1. Start with the block valves closed. A bypass
valve may be used to maintain outlet pressure
in the down stream system without changing the
fol low ing steps.
2. Relax the range spring by turning the adjusting
knob (30) counter clockwise (CCW) a min i mum of
three (3) full revolutions. This re duc es the outlet
(down stream) 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. Assure proper steam
trap operation if installed. Closely monitor outlet
(down stream) pres sure 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.
De ter mine if the regulator is fl owing. If not, slowly
rotate the regulator's adjusting knob clock wise
(CW) until fl ow begins.
outlet pressure drops, the range spring pushes
the di a phragm down, opening the port; as outlet
pres sure in creas es, the diaphragm pushes up
and the port opening closes.
2. A complete diaphragm failure will cause the reg u la tor to fail open.
SECTION IV
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, be gin 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 set point by
turning the adjusting knob CW to in crease outlet
pressure, or CCW to reduce outlet pres sure.
10. Reduce system fl ow 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 pressure on decreasing fl ow should not
exceed the stated upper limit of the range spring
by greater than 10%; i.e. 20-80 psig (1.38-5.52
Barg) range spring, at low fl ow the outlet pressure
should not exceed 88 psig (6.07 Barg), if it does,
consult factory.
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 shut down, 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 constantly
observed and manually regulated. Close the
outlet (down stream) block valve.
2
SECTION V
CAUTION
Do not walk away and leave a bypassed
regulator unattended.
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 reg u la tor re mov al is re quired.
IOM-5381
SECTION VI
VI. MAINTENANCE
WARNING
SYSTEM UN DER PRES SURE. Prior to performing
any maintenance, isolate the reg u la tor from the system and relieve all pres sure. Failure to do so could
result in personal injury.
A. General:
1. Maintenance procedures here in af ter are
based upon removal of the reg u la tor unit
from the pipeline where installed.
5. Remove the diaphragm subassembly
con sist ing of the pressure plate nut
(10), lock wash er (9), pres sure plate (3),
di a phragm (13), push er plate O-ring (15)
and pusher plate (4). NOTE: Refer to the
quan tity of dia phragms (13) in cor po rated
per the bill of ma te ri als listing. De pend ing
on outlet pres sure level, multiple metal
diaph ragms may be “stacked”.
9
13
10
3
2. Owner should refer to owner's pro ce dures for re mov al, handling, cleaning
and disposal of non reuseable parts, i.e.
gas kets, etc.
3. Refer to Figure 2 for basic regulator, item
number reference ( ).
B. Diaphragm Replacement:
CAUTION
To prevent damage to body, use lead jaws when
clamping body in a vise. Position body so that
vise does not close over inlet and outlet connections.
1. Securely install the body (1) in a vise with
the spring chamber (2) oriented up wards.
WARNING
SPRING UNDER COMPRESSION. Prior to re mov ing spring chamber, relieve spring com pres sion by
back ing out the adjusting knob. Failure to so so
may result in fl ying parts that could cause personal
injury.
2. Relax range spring (17) by turning adjusting knob (30) CCW until re moved from
spring cham ber (2).
15
Figure 1: Diaphragm Sub as sem bly
6. Loosen pressure plate nut (10) and
sep a rate all parts (3, 4, 9, 13 & 15) of the
diaphragm sub as sem bly.
7. Inspect pressure plate (3) to assure no
de for ma tion due to over-pressurization.
If de formed, re place.
8. Remove di a phragm gasket (14). (If a
composition di a phragm is used there is
no di a phragm gasket (14).
9. Clean inside body surfaces in ac cor dance with Owner's cleaning pro ce dures.
Do not scratch di a phragm O-ring seating surface NOTE: Maintenance must
in clude a level of clean li ness equal to
Cash co clean ing stan dard #S-1576.
Con tact fac to ry for details.
10. Reassemble diaphragm subassembly
by plac ing push er plate O-ring (15),
diaphragm(s) (13), pressure plate (3) and
lock washer (9) over the threaded post
of pusher plate (4). As sure the pres sure
plate (3) is placed with curved outer rim
down next to the di a phragm (13) surface.
Tighten pusher plate nut (4) to the fol low ing torque values:
4
IOM-5381
3. Loosen spring chamber (2) by placing
wrench on “fl ats” and rotating CCW mak-
ing sure not to use the fl at where the vent
hole is located.
4. Remove spring chamber (2), range spring
(17) and spring button (5).
Sizes Diaphragm Torque Value
Composition 15 in/lbs. (1.7 Nm)
Metal 60 in/lbs. (6.8 Nm)
ALL
11. For metal diaphragm(s) (13), place
dia phragm gas ket (14) into body re cess
(none re quired for com po si tion di a phragm). Set di a phragm sub as sem bly
into the body.
3
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