cashco 345 Instruction manual

CAUTION
Installation of adequate overpressure protection is
recommended to protect the regulator from overpressure
and all downstream equipment from damage in the event
of regulator failure.
MODEL 345
PRESSURE REDUCING REGULATOR
SECTION II
II. INSTALLATION
1. An inlet block valve should always be installed.
2. If service application is continuous such that
shutdown 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
approximately ten pipe diameters downstream,
and within sight.
5. All installations should include a downstream
relief device if the inlet pressure could exceed the
pressure rating of any downstream equipment or
the maximum outlet pressure rating of the unit.
SECTION I
I. DESCRIPTION AND SCOPE
The Model 345 is a diaphragm-less, heavy duty, high pressure reducing regulator used to control downstream (outlet
or P2) pressure. Sizes are 1/2", 3/4", 1" (DN15, 20, and 25 ). With proper trim utilization, the unit is suitable for liquid
and gaseous service. Refer to Technical Bulletin 345-TB for design conditions and selection recommendations.
NOT FOR STEAM SERVICE.
IOM-345
02-16
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
DO NOT HYDROSTATIC TEST THRU AN INSTALLED
UNIT; ISOLATE REGULATOR FROM TEST. Internal
mechanical damage could result. Refer to Technical
Bulletin Model 345, Table 5 for "emergency overpressure
level" that will not do irreparable damage. In addition,
note on nameplate that Inlet and Outlet pressure ratings
are at different levels.
CAUTION
8. Flow Direction: Install so the flow direction
matches the arrow cast on the main regulator
body.
9. Basic Regulator - (Refer to Figure 1): Regulator
may be rotated around the pipe axis 360o. Recom-
mended position is with spring chamber vertical
upwards. Orient such that the spring chamber
vent hole does not collect rainwater or debris.
10. Regulatorsarenottobedirectburiedunderground.
6. Clean the piping of all foreign material including
chips, welding scale, oil, grease and dirt
before installing the regulator. Strainers are
recommended.
7. In placing thread sealant on pipe ends prior to
engagement, assure that excess material is
removed and not allowed to enter the regulator
upon startup.
CAUTION
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
damagenon-metallicpartsifnotremoved. NOTE:Thisdoes
not apply to units equipped with extended pipe nipples.
ISO Registered Company

2 IOM-345
III. PRINCIPLE OF OPERATION
SECTION IV
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
following steps.
2. Relax the range spring by turning the T-bar handle
adjusting screw counter clockwise (CCW) a
minimum 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
expansion of the piping. Closely monitor outlet
(downstream) pressure via gauge to assure not
over-pressurizing. NOTE: If no bypass valve is
installed, 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
observing the outlet (downstream) pressure
gauge. Determine if the regulator is flowing. If not,
slowly rotate the regulator T-bar adjusting screw
handle clockwise (CW) until flow begins.
SECTION V
V. SHUTDOWN
1. On systems with a bypass valve, and where system
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.) Close the
outlet (downstream) block valve.
SECTION III
Movement occurs as pressure variations register on the pressure piston. The registering pressure is the outlet, P2,
or downstream pressure. The range spring opposes pressure piston movement. As outlet pressure drops, the range
spring pushes the pressure piston down, opening the port; as outlet pressure increases, the pressure piston pushes
up and the port opening closes.
Do not walk away and leave a bypassed regulator
unattended!
CAUTION
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
piping system isn't pressurized. If the outlet
(downstream) 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
increase outlet pressure, or CCW to reduce outlet
pressure.
10. Reduce system flow to a minimum level and
observe set point. Outlet pressure will rise from
the set point of Step 9. The maximum rise in outlet
pressure 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.
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 removal is required.

IOM-345 3
SPRING UNDER COMPRESSION. Prior to removing
spring chamber, relieve spring compression by backing
out the T-bar adjusting screw. Failure to do so may result
in flying parts that could cause personal injury.
2. Relax range spring (14) by turning T-bar
adjusting screw handle (6) CCW to release spring
compression.
3. Grasp hexagon portion (w/proper wrench) of the
spring chamber (2) and turn CCW to remove.
4. Remove the thrust bearing (9), range spring (14),
and spring button (4).
5. Pull the pressure piston (3) directly out of the body.
Inspect the body quad ring (11) and body back up
ring (12). If nicked or scratched, replace. Apply
a light coating of lubricant to body quad ring (11)
when replacing.
6. Inspectpressurepiston(3)toassurenodeformation
due to over-pressurization. If deformed, replace.
7. Reverse steps 1 through 5 for reassembly. Make
VI. MAINTENANCE:
A. General:
1. Maintenance procedures hereinafter are based
upon removal of the regulator unit from the pipeline
where installed.
2. Owner should refer to owner's procedures for
removal, handling, cleaning and disposal of non-
reuseable parts, i.e. gaskets, etc.
3. Refer to Figure 1 for the basic regulator, metal seat
design and Figure 2 for a blow-up of the balanced
TFE trim.
B. Pressure Piston/O-Ring: Inspection/ Replacement:
1. Securely install the body (1) in a vise with the spring
chamber (2) directed upwards.
SECTION VI
NOTE: Never replace the socket head capscrews
(21) with just any bolting. Use only the proper size
and grade as replacement.
SYSTEM UNDER PRESSURE. Prior to performing any
maintenance, isolate the regulator from the system and
relieve all pressure. Failure to do so could result in
personal injury.
WARNING
WARNING
Regulator Size Cap Screw Size Torque
1/2", 3/4" & 1"
(DN15, 20, 25)
3/8"-16-1"
skthd cap screw
50 ft./lbs.
(68 N-m)
sure spring chamber (2) is tightened fully down
against body (1).
C. Trim Replacement (For Metal Seated Units):
1. Install body (1) in a vise with the body cap (5) on
top.
2. Using a 5/16" Allen wrench, remove socket head
cap screws (21). Carefully remove body cap from
body.
3. Remove piston spring (17), piston (15 or 15.1),
cylinder (16 or 15.2) and cylinder gasket (18).
Inspect parts for excessive wear, especially at seat
surfaces. Replace if worn, nicked, or depressed.
4. Remove body cap o-ring (13) and clean contacting
surface of body. Clean flat mating surfaces of body
(1) to body cap (5) shoulder.
5. Clean debris from within regulator body (1) cavity.
Clean parts to be reused. NOTE: On regulators
originally supplied as "oxygen clean", option 345-
55, maintenance must include a level of cleanliness
equal to Cashco's cleaning standard #S-1134.
Contact factory for details.
6. Replace cylinder gasket (18) on cylinder (16 or
15.2)
7. Reinstall the cylinder (16 or 15.2) and cylinder
gasket (18) into body cavity.
8. Slide the piston (15.1) slowly into place, assuring
that the piston (15.1) post slides into the pressure
piston (3).
9. Carefully place piston spring (17) directly on top of
the piston (15.1).
10. Install body cap o-ring (13) on body cap (5) and
carefully place body cap (5) into body (1). Replace
socket head cap screws (21) and tighten with a
5/16" Allen wrench. Recommended torque is as
follows:

4 IOM-345
NOTE: When piston (15) assemblies are used with comp
seats, Cashco, Inc. does not recommend attempting to
remove the comp seat. If composition seat is damaged,
replace entire piston assembly.
SECTION VII
Vll.TROUBLE SHOOTING GUIDE
11. Bench test unit for suitable operation. NOTE:
Regulators are not tight shutoff devices. Even if
pressure builds up beyond set point, a regulator
may or may not develop bubble tight shutoff. In
general, tighter shutoff can be expected with
composition seat.
12. Soap test around body cap (5) and body(1) for
leakage. Test pressure should be a minimum
of 100 psig (6.9 Barg) at the inlet and leakage
determined by bubbles.
D. Trim Replacement (For TFE Seated Units):
1. Follow same steps as listed under trim replacement
for metal seated units, except for the following
guidelines:
a. After removing the body cap(5) (C.2), inspect
the inside surface of the body cap for scratches
or nicks. These could result in leakage past the
quad ring (19) and backup ring (20). If worn
or scratched replace the body cap (5).
b. When inspecting parts for excessive wear
(C.3), assure there are no foreign particles
embedded in the teflon seat. Inspect for nicks.
Inspect the backup ring (20) and quad ring (19)
on piston post.
c. Remove the body cap o-ring (13) and clean
contacting surface of body.
2. To check for seat leakage, follow same steps as
listed under Pressure Piston/O-ring Inspection/
Replacement, except for the following guidelines:
a. Pour a small amount of water in on top of the
piston (through pressure piston bore in body).
Crack open inlet pressure (50 psig maximum)
to body and visually check for leakage by the
cylinder gasket (18), TFE seat (15), or the body
quad ring (19). After inspection, assure that
water is removed before completing assembly
and installing in line.
1. Erratic operation.
Possible Causes Remedies
A. Oversized regulator; inadequate rangeability. A1. Check actual flow conditions, re-size regulator for minimum and
maximum flow.
A2. Increase flow rate.
A3. Decrease regulator pressure drop; decrease inlet pressure by
placing a throttling orifice in inlet piping union.
A4. Install next step higher range spring.
A5. Before replacing regulator contact factory
B. Worn piston/cylinder; inadequate guiding. B. Replace trim.
C. Weakened/broken piston spring. C. Replace piston spring.
2. Sluggish operation.
Possible Causes Remedies
A. Plugged piston balance port. A. Remove trim and clean balance port.
B. Fluid too viscous. B. Heat fluid. Contact factory.

IOM-345 5
3. Downstream Pressure will not reach desired setting
Possible Causes Remedies
A. Regulator undersized. A1. Confirm by opening bypass valve together with regulator.
A2. Check actual flow conditions, re-size regulator; if regulator has
inadequate capacity, replace with larger unit.
B. Plugged trim. B. Remove trim and check for plugged holes in cylinder.
C. Incorrect range spring (screwing in CW of adjusting screw does
not allow bringing pressure level up to proper level).
C. Replace range spring with proper higher range. Contact factory.
D. Too much droop. D1. Review droop expected.
D2. Contact factory.
E. Restricted pressure piston movement. E. Assure no moisture in spring chamber at temperatures below
freeze point. Assure no dust or debris entering vent openings.
4. Leakage through the spring chamber vents.
Possible Causes Remedies
A. Failure of body quad ring and body backup ring. A. Inspect the pressure piston, body quad ring and body backup
ring. If scratched, nicked, or deformed - replace.
5. Excessive pressure downstream.
Possible Causes Remedies
A. Regulator not closing tightly. A.1. Inspect the seating. Clean and lap metal seat surfaces; replace
if lapping does not remedy. If composition seats are depressed,
nicked or embedded with debris, replace trim.
A2. Inspect guides in body cap (Balanced trim). If damaged, replace
body cap and/or piston, quad ring and back up ring.
B. Downstream block. B. Check system; isolate (block) flow at regulator inlet - not outlet.
Relocate regulator if necessary.
C. No pressure relief protection. C. Install safety relief valve, or rupture disc.
D. Restricted pressure piston movement. D. Assure no moisture in spring chamber at temperatures below
freeze point Assure no dust or debris entering vent openings.
6. Excessive seat leakage.
Possible Causes Remedies
A. Foreign matter on seating surface, erosion of seating surface,
scratched body cap.
A. Inspect and replace damaged parts.
B. Balanced trim B. Inspect piston quad ring and back up ring. Replace if damaged.

6 IOM-345
SECTION VIII
NEW REPLACEMENT UNIT:
Contact your local Cashco, Inc., Sales Represen-
tative with the Serial Number and Product code.
With this information they can provide a quotation
for a new unit including a complete description,
price and availability.
–7–
VIII. ORDERING INFORMATION
NEW REPLACEMENT UNIT vs PARTS "KIT" FOR FIELD REPAIR
To obtain a quotation or place an order, please retrieve the Serial Number and Product Code that was stamped
on the metal name plate and attached to the unit. This information can also be found on the Bill of Material
("BOM"), a parts list that was provided when unit was originally shipped. (Serial Number typically 6 digits).
Product Code typical format as follows: (last digit is alpha character that reflects revision level for the product).
PARTS "KIT" for FIELD REPAIR:
Contact your local Cashco, Inc., Sales Represen-
tative with the Serial Number and Product code.
Identify the parts and the quantity required to repair
the unit from the "BOM" sheet that was provided
when unit was originally shipped.
NOTE: Those part numbers that have a quantity indicated
under "Spare Parts" in column "A” reflect minimum
parts required for inspection and rebuild, - "Soft
Goods Kit". Those in column “B” include minimum
trim replacement parts needed plus those "Soft
Goods" parts from column "A".
If the "BOM" is not available, refer to the cross-
sectional drawings included in this manual for part
identification and selection.
A Local Sales Representative will provide quotation
for appropriate Kit Number, Price and Availability.
CAUTION
Do not attempt to alter the original construction of any
unit without assistance and approval from the factory. All
purposed changes will require a new name plate with ap-
propriate ratings and new product code to accommodate
the recommended part(s) changes.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to
modify or improve the designs or specifications of such product at any time without notice.
Cashco, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any
Cashco, Inc. product remains solely with the purchaser.

IOM-345 7
Figure 1: Basic Model 345 with metal seat design.
Figure 2: Composition Seat Design
Item No.Description Item No. Description
1 Body 13 Body Cap O-Ring ‡
2 Spring Chamber 14 Range Spring
3 Pressure Piston 15 Piston - Comp
4 Spring Button 15.1 Piston-Metal ‡
5 Body Cap 15.2 Cylinder-Metal ‡
6 Adjusting Screw 16 Cylinder-Comp
7 Set Screw 17 Piston Spring ‡
8 T-Bar Handle 18 Cylinder Gasket ‡
9 Thrust Bearing 19 Pistion Quad Ring
10 Name Plate 20 Piston Backup Ring
11 Body Quad Ring ‡21 Socket Head Cap Screw (6)
12 Body Backup Ring ‡
‡ Available with Parts Kit B

Cashco, Inc.
P.O. Box 6
Ellsworth, KS 67439-0006
PH [phone]
Fax. # [phone]
www.cashco.com
email: [email protected]
Printed in U.S.A. IOM-345
Cashco do Brasil, Ltda.
Al.Venus, 340
Indaiatuba - Sao Paulo, Brazil
PH [phone]
Fax. No.
www.cashco.com
email: [email protected]
Cashco GmbH
Handwerkerstrasse 15
15366 Hoppegarten, Germany
PH [phone]
Fax. No. [phone]
www.cashco.com
email: [email protected]