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I. DESCRIPTION AND SCOPE
Model DA0 is a pressure reducing regulator used to control downstream (outlet or P2) pressure. Sizes are
1/2" (DN15), 3/4" (DN20), 1" (DN25), 1-1/4" (DN32), 1-1/2" (DN40), 2" (DN50), 3" (DN80) and 4" (DN100). Refer
to Technical Bulletin DA0-TB for design conditions and selection recommendations. (NOTE: This product was
formerly identified as a Model D0; a Model DA0 and D0 are one and the same product.)
This manual does not include instructions related to the various methods of pressure loading a Model DA0
main valve.
II. REFERENCES
Refer to Technical Bulletin DA0-TB and DAG-TB
for tech ni cal specifications for this reg u la tor.
III. INSTALLATION
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.
1. Regulator may be rotated around pipe axis 360
degrees. For ease of maintenance, the rec om-
mend ed position is with the cover dome (25)
up wards.
2. Provide space below, above, and around reg u la-
tor for removal of parts during maintenance.
3. Install block valves and pressure gauges to pro-
vide means for adjustment, operation, bypass,
or removal of the regulator. A pipeline strainer
is recommended before inlet to remove typical
pipe line debris from entering valve and damaging
internal "soft goods", primarily the dynamic seal.
4. Steam traps should be installed before and after
the regulator to provide proper drainage.
5. Install the regulator with the flow in the direction
of the arrow cast or stamped into the body.
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
MODEL DA0
DIRECT-ACTING, PRESSURE LOADED
PRESSURE REDUCING REGULATOR
for STEAM APPLICATIONS
CAUTION
SECTION I
SECTION II
CW
CCW –
SECTION III
6. For best performance, it is recommended that
the piping upstream and downstream of the
regulator be straight and free from any restric-
tions or bends, which can cause turbulence, for
a minimum length of approximately fifteen to
twenty pipe diameters.
7. Pipe size should be given special consideration,
particularly downstream of the regulator, to
ensure that the steam velocity does not exceed
industry or customer guidelines.
DAG-TB, Table DAG-11 for rec om men da tions
for applying external pressure sensing.
8. External sensing, uses an external control line.
This line is connected from the 1/4" (DN8) NPT
tap on the side of the pilot body to a pressure
tap down stream of the regulator. Use 1/4" or
3/8" (DN8 or 10) outer di am e ter tubing or 3/8"
(DN10) pipe having an inner di am e ter equiv a lent
to Schedule 40 pipe. For condensable vapors
(i.e. steam), slope the external sensing line
downward 2 to 5 de grees to the outlet piping
and prevent water pock ets, which allows the
diaphragm chamber to always be self draining.
ABBREVIATIONS
–
Clockwise
Counter Clockwise
ITA
–
Inner Trim Assembly
IOM-DA0
02-20
Reference
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Summary of Contents for cashco DA0
- Page 1 SECTION I I. DESCRIPTION AND SCOPE Model DA0 is a pressure reducing regulator used to control downstream (outlet or P2) pressure. Sizes are 1/2" (DN15), 3/4" (DN20), 1" (DN25), 1-1/4" (DN32), 1-1/2" (DN40), 2" (DN50), 3" (DN80) and 4" (DN100). Refer to Technical Bulletin DA0-TB for design conditions and selection recommendations.
-
Page 2: Principle Of Operation
CAUTION 8. When flow is established steady enough that the outlet (downstream) block valve is fully open, begin Do not walk away and leave a bypassed reg u la tor to slowly close the bypass valve if installed. unattended! IOM-DA0... -
Page 3: Maintenance
Step 9 for a Model setpoint to the desired outlet pressure level. DA0. The max i mum rise in outlet pres sure on de creas ing flow should not exceed the 10%. If it does, consult factory. - Page 4 (20) if op er at ing con di tions of pressure, pressure spindle area. NOTE: The spin dle “slides” in drop, or temperature are ex ceed ing limits. IOM-DA0...
- Page 5 (minimum of two (2) ous ly use fin gers to lightly circumferentially hours) prior to final re as sem bly. press the first piston ring seal inwards into the piston-guide bearing groove until the first IOM-DA0...
- Page 6 Use hand to apply downward force to the top of the cage (19) until the ITA is lowered suf- fi cient ly to engage the cage cap screws (18) Figure 4: Location of Auxiliary Ports IOM-DA0...
- Page 7 (10.3 Barg) with air or GN b. Spray liquid lead detector and check all ex ter nal leak points; i.e. plugged con nec- tions, and flange bolting. 4. Excessive leakage will require disassembly, examination of sealing elements, correction of problem, reassembly and retesting. IOM-DA0...
-
Page 8: Section Viii
SECTION VIII VIII. PRESSURE LOADING 2. The Model DA0 exhibits a deviation in outlet 1. Loading pressure can be supplied using various controlled pressure when the inlet pressure var- schemes. Please reference LOADING SYSTEMS ies; this “effect” is identified as ISR – Inverse on web-site for the schematics of these various Sympathetic Ratio. -
Page 9: Troubleshooting Guide
Check actual flow conditions; resize regulator for minimum and maxi- directly next to seat. mum flow; if necessary, replace with smaller size regulator. * Seat leakage may be diagnosed when a failure of the dynamic side seal has occurred. Inspect both potential internal leak paths. IOM-DA0... -
Page 10: New Replacement Unit
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. - Page 11 14 * Seal Cover Dome 15 * Cage Seal 27 * Dynamic Seal (see Figure 1) 16 * Wiper Seal 37 * Gasket Washer Washer (on 1/2"- 2" sizes below No.7) Cage Cap Screws Cage * Recommended Repair Parts. IOM-DA0...
- Page 12 ATEX 2014/34/EU: Explosive Atmospheres and Cashco Inc. Products Cashco, Inc. declares that the products listed in the table below has been found to comply with the Essential Health and Safety Requirements relating to the design and construction of products intended for use in potentially explosive atmospheres given in Annex II of the ATEX Directive 2014/34/EU.
- Page 13 MPRV-H, MPRV-L PBE, PBE-L, PBE-H CA-1, CA-2 CA1, SA1, CA4, SA4, CA5, SA5 DA2, DA4, DA5, DA6, DA8 DA0, DA1, DAP, SAP SLR-1, SLR-2, PTR-1 ALR-1, ULR-1, PGR-1 BQ, BQ(OPT-45), BQ(CRYO) 123, 123(CRYO), 123(OPT-45), 123(OPT-46G) 123-1+6, 123-1+6(OPT-45), 123-1+6(OPT-46G), 123-1+6+S, 123-1+6+S(OPT-40)
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