cashco ALR-1 Panduan Pemasangan, Pengoperasian & Pemeliharaan - Halaman 11

Jelajahi secara online atau unduh pdf Panduan Pemasangan, Pengoperasian & Pemeliharaan untuk Pengontrol cashco ALR-1. cashco ALR-1 17 halaman. Direct-acting, pressure loaded, pressure reducing regulator with auxiliary air supply

Halaman Cetak
VIII. PRESSURE LOADING
1. The Loading pressure for the ALR-1 is supplied
from an external loading source and is regulated
by the Back Pressure UnLoader.
= ISR Effect + Lower Piston Spring + Lower Piston Spring +
P
LOAD
P
= P
+ [ISR x (P
Load
2
IOM-ALR-1

SECTION VIII

LOADING PRESSURE FOR
Main Regular Assembly
APPLIED PRESSURES
Compression Effect
)] + C
Req'd
– P
x ∆P
V
1
2
C
Max
V
Figure 6: Loading Pres sure Formula
2. The Model ALR-1 exhibits a deviation in outlet
controlled pressure when the inlet pressure var-
ies; this "effect" is identified as ISR – Inverse
Sympathetic Ratio. Its relative pressure effect
can be calculated from the following equation.
LOWER PISTON
SPRING RANGE
psig
(Barg)
none
(none)
2 - 5
(.14 - .34)
1 - 2
(.07 - .14)
4 - 10
(.28 - 6.9)
SIZE / ORIENTATION – S/O Factor
Body Size
in
(DN)
1/2" - 1"
1 1/4" - 1 1/2" (32 - 40)
2"
2 1/2" - 3" (65 - 80)
4"
(100)
Spring Preload
Orientation Effect
+ LVPS + S/O
Piston Spr.
ISR FACTOR
BODY SIZE
in
(DN)
1/2" - 1"
(15 - 25)
1 1/4" - 1 1/2"
(32 - 40)
2"
(50)
2 1/2" - 4" (65 - 100)
PISTON SPRING
∆P Piston
Spring
psig
(Barg)
0
(0)
3
(.21)
1
(.07)
6
(.41)
Orientation
Cover Dome
Cover Dome
on Top
(15 - 25)
1
2
(50)
2.5
3
4
Body Size
Factor
ISR – %
3.0
4.0
2.0
5.4
LVPS
psig
(Barg)
0
(0)
2
(.14)
1
(.07)
4
(.28)
on Bottom
-1
-2
-2.5
-3
-4
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