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Section 4:
Mechanical Installation
Purge Orifice Size Identification
•
Reference figure 4.13 and the Purge Plug Identification Table.
•
Each dryer is pre-set with the correctly sized purge valve for an operating pressure of 7 barg (100 psig) at point of order.
•
The lettering (A through S), located on the purge valve body, indicates the orifice size selected to suit the operating pressure of
the dryer per the chart below.
•
If the inlet pressure to the dryer will be different than the pre-set orifice size, the purge valve can be adjusted.
•
Most dryers use a single orifice purge valve represented by the Blue and Green single letter references in the table below.
•
Larger dryers may require a two or three hole purge valve as represented by the Red and Yellow two and three letter references.
•
To select the correct orifice size, locate the appropriate dryer model at the left side of the table and then the operating pressure
at the top.
•
Make sure that the correct valve body (1, 2 or 3 hole) and orifice disc (01, 02, 03 or 04) has been supplied with the dryer. The
discs have the number (01, 02, 03 or 04) stamped out at the top.
Every dryer is shipped with a purge orifice set up for 7 barg (100 psig) operation. The dryer will also include the necessary
purge valve components to configure the dryer to operate at any pressure from 4 barg (58 psig) to 13 barg (189 psig). For
example: A PD0150 dryer will be supplied with a single hole purge assembly with an 02 purge disc installed and indexed to
position F. Additional purge valve components will be included to allow the dryer to be configured to purge settings, CK, M,
H, D, B, A, S, P and N.
Appropriate purge plug selection is very important for function of the dryer. Failure to comply with this may affect your
warranty.
Purge Plug Identification
Operating
pressure
4
5
6
7
8
9
10
11
12
13
Dryer
PD0046
M
K
I
H
G
F
E
E
E
D
PD0056
P
M
L
K
J
I
H
G
F
F
PD0075
B
S
P
M
L
L
K
I
I
H
PD0090
C
A
P
P
N
L
K
J
I
H
PD0110
I
E
C
A
P
M
K
K
J
I
PD0150
CK
M
G
F
C
B
A
S
S
P
PD0180
EM
CK
P
I
G
E
C
B
A
A
PD0220
AFK
FN
DL
P
K
H
F
E
D
C
PD0360
EJP
DIN
CHM
AFK
AFK
GP
EM
DL
BJ
AI
Disc
01
02
03
04