Cashco 1000 LP - Manual (Page 2)

IOM-1000LP-Basic 2
6. Clean the pip ing of all foreign material in clud ing
chips, welding scale, oil, grease and dirt before
installing the regulator. Strainers are rec om -
mended.
7. In placing thread sealant on pipe ends prior to
en gage ment, ensure that excess material is
re moved and not allowed to enter the regulator
upon startup.
8. Flow Direction: Install so the fl ow direction
match es the arrow cast on the body.
9. For best performance, install in well drained
hor i zon tal pipe. Ensure regulator is properly
trapped if used in a steam ser vice application.
10. Basic regulator may be rotated around the pipe
axis 360° , and may be installed in a horizontal
or vertical pipe line. Rec om mend ed po si tion is
with spring cham ber ver ti cal upwards. Orient
to pre vent the spring cham ber vent hole from
col lect ing rain wa ter or debris.
11. Regulators are not to be direct buried under-
ground.
12. For insulated piping systems, recommen dation
is to not insulate regulator.
13. Cashco does not recommend fi eld welding on
the cyl in der (inlet) end of the body due to the
pos si bil i ty of warpage.
SECTION III
III. PRINCIPLE OF OPERATION
1. The Model 1000 is available in two variations:
1000LP (larger diaphragm) for downstream
pres sure control from 1-30 psig (.07-2.1 Barg);
1000HP (small er diaphragm) for down stream
pressure control from 10-300 psig (.69-20.7
Barg), body size dependent.
2. Movement occurs as pressure variations reg-
ister on the diaphragm. The registering pres sure
is the outlet, P
2
, or downstream pressure. The
range spring opposes di a phragm move ment.
As out let pressure drops, the range spring
push es the diaph ragm down, opening the port;
as outlet pressure increases, the dia phragm
pushes up and the port closes.
3. The Model 1000 includes a rocker arm in its op-
er a tion al mechanism. The rocker arm allows the
regulator to operate fl ow-to-open (FTO), rather
than conventional fl ow-to-close (FTC), which
increases rangeability.
4. Due to the FTO design, there is a limit as to how
low of a downstream (P
2
or outlet) pressure level
setting is capable for a given inlet P
1
pres sure.
This is a function of the ratio of the port area to
diaphragm area. It is possible for there to be
too high of an inlet pressure for the regulator to
close off against. (Refer to 1000-TB, Tables 9
through 12 for limits.) Reduced ports, Option
1000-12, allow lower down stream (P
2
or outlet)
pressure settings for a given up stream (P
1
or
inlet) pres sure level.
5. The FTO design also is limited by a minimum
pres sure drop. If the pressure drop is below 5
psid, an Option 1000-17 piston spring should be
utilized to assist open ing the piston.
6. The Model 1000 includes an aspiration jet ef-
fect, due to the clearance of the piston from the
body near the outlet. These clear ances vary as
to whether the fl uid is a gas (including steam), a
liquid, or a viscous liquid (requires Option 1000-
27). Jets must be se lec ted to match one of these
three general fl uids. An improper jet will reduce
perfor mance.
7. A complete diaphragm failure will cause the
regulator to fail open.
CAUTION C
The maximum outlet pressure listed on the name-
plate is the “upper operative limit” for the sens ing
di a phragm. High er pres sures could damage the di a-
phragm. (Field hy dro static tests fre quent ly de stroy
dia phragms. DO NOT HY DRO STAT IC TEST THRU AN
IN STALLED UNIT; ISO LATE FROM TEST.)