cashco 1000HP Panduan Pemasangan, Pengoperasian & Pemeliharaan - Halaman 2
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10. For best performance, install in well drained
hor i zon tal pipe, properly trapped if a steam ser vice
ap pli ca tion.
11. Differential Regulator – (Refer to Dwg. Opt-1+6
for single diaphragm or Dwg. Opt-1+8 for double
III. PRINCIPLE OF OPERATION
1. The differential Model 1000HP is also available
in two options: 1000HP-1+6 is single diaphragm
con struc tion; 1000HP-1+8 is double diaphragm
con struc tion. The dou ble diaphragm construction
prevents the loading fluid from direct mixing with
the system fluid in case of di a phragm failure.
2. Movement occurs as pressure variations register
on the diaphragm. One pressure is the outlet (p
or down stream pressure, which registers on the
"un der neath" side of the diaphragm. The second
pressure reg is tered is the loading (P
in the spring chamber "above" the di a phragm.
The range spring determines the differential
pres sure level (P
drops, the range spring pushes the diaphragm
down, open ing the port; as outlet (P
in creas es, the diaphragm pushes up and the port
closes. As the loading (P
outlet (P
) pressure tends to follow. An increase
2
in P
(∆P
Load
Load
by near ly an equal amount (∆P
decrease in P
Load
outlet P
pres sure.
2
3. The Model 1000 includes a rocker arm in its
operation mechanism. The rocker arm allows the
regulator to op er ate flow-to-open (FTO), rather
than conventional flow-to-close (FTC), which
in creas es rangeability.
4. Due to the FTO design, there is a limit as to how
low of a downstream (P
setting is capable for a given inlet P
This is a function of the ratio of the port area to the
diaphragm area. It is possible for there to be too
high of an inlet pressure for the regulator to close
off against. (Refer to 1000HP-DIFF-TB, Ta bles 9,
10, 11 and 12 for limits.) Reduced port, Opt-12,
allows lower down stream (P
settings for a given upstream (P
level.
2
) pres sure
Load
). As outlet (P
) pressure
Set
2
) pressure
2
) pressure varies, the
Load
) will increase outlet P
pressure
2
= ∆P
Load
will have a similar effect on
or outlet) pressure level
2
pressure.
1
or outlet) pres sure
2
or inlet) pressure
1
diaphragm design): Regulator may be rotated
around the pipe axis 360° and may be installed
in a horizontal or vertical pipeline.
12. Regulators are not to be direct buried un der ground.
SECTION III
5. The Model 1000 includes an aspiration jet effect,
due to the clearance of the piston from the body
near the outlet. These clearances vary as to
whether the fluid is a gas (including steam), a liquid,
or a viscous liquid (required Opt-27). Jets must
be selected to match one of these three general
fluids. An improper jet will reduce per for mance.
NOTE: The regulator requires minimum output
)
2
pressure level or the regulator will not close.
∆P
= P
- P
Sizing
1
P
> P
2
Load
P
= P
+ P
2
Load
∆P
= P
Differential
); a
2
6. For a 1000HP-1+6 (single diaphragm) design, a
com plete diaphragm failure will cause the fluids
to mix in the spring chamber or loading pressure
piping system.
7. For a 1000HP-1+8 (double diaphragm) design, a
complete diaphragm failure will cause the reg u la tor
to fail open, leaking fluid through the annular ring
vent hole.
NOTE: Composition (soft) diaphragms may be
utilized only on -1+6 single diaphragm con struc tion.
8. For viscous fluids normally heated (heavy fuel
oil), it may be desirable to include a flow-through
spring cham ber, the -65 Option.
2
RANGE SPRING:
SETTING @ P
Set
- P
2
Load
1000HP-1+6
DIFFERENTIAL SCHEMATIC
IOM-1000HP-Dif fer en tial
Set
LOADING
FLUID @ P
Load
Diaphragm
OUTLET
@ P
2
& T
2