48-4
Flowserve Corporation, Valtek Control Products, Tel. USA 801 489 8611
Cam Removal: Disconnect cam return spring. With a
wrench carefully placed on the output shaft (if
necessary), loosen and remove the jam nut. Remove
pressure from the span arm by pushing it away from
the cam. Remove the cam.
Cam Installation:
1.
A) For NAMUR shaft end connections make sure
shaft is properly aligned with coupler or actuator.
B) For Sereg actuators, make sure follower pin is in
follower arm groove.
2.
Push span arm away from shaft to avoid pressure
on the cam.
3.
Place cam over the shaft with the appropriate char-
acteristic facing up and closest to the span arm
roller. For Sereg cams, see Table I. For Accord
cams, ‘D’ represents direct-acting and ‘R’ repre-
sents reverse acting.
4.
A) For NAMUR shaft end connections, make sure
the round mark on the left hand side of the charac-
teristic curve is lined up with the span arm roller
bearing. See Figure 4.
B) For Sereg actuators, mare sure the line on the left
hand side of the characteristic curve is lined up
through the middle of the span arm roller bearing.
See Figure 5.
5.
Tighten jam nut making sure cam does not rotate.
Use a flat screwdriver to prevent cam rotation and
shaft flats to prevent shaft rotation (if necessary).
6.
Connect supply pressure to port marked ‘Supply.’
7.
Stroke actuator / valve two or three times to align
position with actuator. With a 50 percent input
signal, tighten all mounting bolts. Stroke actuator to
verify proper alignment.
POSITIONER CALIBRATION
Introduction
Valtek positioners are calibrated at the factory; how-
ever, due to shipping and handling, it may be necessary
to check the calibration before operating the valve. The
XL90 positioner can be calibrated to a range of 3-15;
two-way split range, 3-9, or 9-15; and three-way split
ranging, 3-7, 7-11, 11-15 psi using the standard feed-
back spring.
WARNING: When stroking the actuator during
calibration, keep hands, hair and clothing away
from moving parts. Failure to do so may cause
serious personal injury.
Note: Positioners and I/Ps are calibrated at the
factory. Use mechanical adjustments in posi-
tioner for calibration. Zero and span on I/P should
not be used to calibrate the valve.
For calibration, proceed as follows:
1. For 3-15 or 3-9 psi range, loosen by hand the zero
adjustment locking knob and adjust zero adjust-
Table I: Cam Characteristic Identification Sereg
Figure 5: Alignment for Sereg Cams
e
d
i
u
G
m
a
C
r
o
t
a
u
t
c
A
g
e
r
e
S
R
N
X
N
L
N
c
i
t
s
i
r
e
t
c
a
r
a
h
C
g
u
l
P
r
a
e
n
i
L
o
l
F
x
a
M
r
a
e
n
i
L
t
n
e
c
r
e
P
l
a
u
q
E
r
a
e
n
i
L
t
n
e
c
r
e
P
l
a
u
q
E
n
o
i
t
i
s
o
P
li
a
F
e
s
o
l
C
n
e
p
O
e
s
o
l
C
n
e
p
O
e
s
o
l
C
n
e
p
O
e
s
o
l
C
n
e
p
O
e
s
o
l
C
n
e
p
O
g
n
i
t
c
A
t
c
e
r
i
D
r
e
n
o
i
t
i
s
o
P
r
a
e
n
i
L
A
B
N
M
A
B
%
l
a
u
q
E
C
E
Q
P
N
M
C
E
A
B
d
o
M
%
l
a
u
q
E
B
A
g
n
i
t
c
A
e
s
r
e
v
e
R
r
e
n
o
i
t
i
s
o
P
r
a
e
n
i
L
B
A
M
N
B
A
%
l
a
u
q
E
E
C
P
Q
M
N
E
C
B
A
d
o
M
%
l
a
u
q
E
A
B
