Cashco DA1 - Manual

INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM) IOM-DA1
11-13
I. DESCRIPTION AND SCOPE
The Model DA1 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).
With proper trim uti li za tion, the unit is suitable for liquid, gaseous, or steam service. Refer to Technical Bulletin
DA1-TB for design conditions and selection recommendations. (NOTE: This product was formerly identifi ed as
a Model D1; a Model DA1 and D1 are one and the same product.)
MODEL DA1
DA1 - DIRECT-ACTING, SPRING LOADED
PRESSURE REDUCING REGULATOR
SECTION I
II. REFERENCES
Refer to Technical Bulletin DA1-TB and DAG-TB for
tech ni cal specifi cations of a Model DA1 regulator.
ABBREVIATIONS
CCW – Counter Clockwise
CW – Clockwise
ITA – Inner Trim Assembly
III. INSTALLATION
pipe line debris from entering valve and damaging
internal “soft goods”, primarily the dynamic seal(27)
and the V-TFE seat (21) when applied.
4. Downstream Sensing Installation Considerations
– Internal or External Sensing:
a. The regulator may be installed with inter-
nal or external sensing. Unless otherwise
specifi ed, the regulator is supplied by factory
with internal sensing. The regulator may be
con vert ed in the fi eld to external sensing (see
Section VII Maintenance, Paragraph H).
b. Reference DAG-TB, Table DAG-11 for recom-
mendations for applying external pressure
sensing.
c. For internal sensing, no external line is re-
quired. For external sensing, use an external
control line. The line is connected from the port
(1/4" NPT) on the side of the body di a phragm
fl ange (see port 5 in Fig. 5) to a pres sure tap
10 to 15 pipe diameters downstream of the
reg u la tor. Use 1/4" or 3/8" outer di am e ter
tubing or 3/8" (DN10) pipe hav ing an inner
di am e ter equiv a lent to schedule 40 pipe.
d. For condensable vapors (i.e. steam) slope the
external sensing line downward 2 to 5 de grees
to outlet piping to prevent water pock ets,
SECTION III
SECTION II
For welded installations, all internal trim parts, seals
and diaphragm(s) must be removed from reg u la tor
body prior to welding into pipeline. The heat of
fusion welding will dam age non-metallic parts if
not re moved. NOTE: This does not apply to units
equipped with extended pipe nip ples.
CAUTION A
1. Regulator may be rotated around pipe axis 360
degrees. For ease of maintenance, the recom-
mended position is with the spring chamber (4)
upwards. In liquid service it is recommended that
the spring cham ber (4) be oriented downwards, and
that a cus tom er supplied and installed vent valve
be pro vid ed at the external sensing con nec tion to
bleed-off trapped gas/air under the di a phragm.
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