15
2) Replacement of valves
(It is recommended to replace at the same time when replacing diaphragms.)
Use tool No. 1, 2, 3, 4, 6 and 7
Reference photographs (Photo 14 -) show the cases when replaced the diaphragm and the valve at the
same time. When replacing a valve only, carry out the following process while attaching the pump head
to the main unit.
(1) Remove DA-41D,81S inlet / exhaust pipe, front panel, and top panel
* Procedure is the same as (1) to (3) of 1) replacement of diaphragm.
It is not necessary to detach DA-41DK ,81SK inlet / exhaust pipe, panels.
Photo14
Photo15
(2) Remove 6 pcs. of hexagon socket head cap screw (M5 x 20) and disassemble pump head
and valve retainer. When the work on the one step is finished, disassemble another pump
head similarly. (Photo 14)
(3) Detach valve plate.
* No adhesive / screws are used for mounting the valve plate. Valve plate can be detached easily by
hands since the valve plate is simply embedded in a circular form groove. (Photo 15)
* Valve plates of 2 pcs. each DA-41D (K) and 81S (K) are embedded.
Hexagon socket
head cap screw
(M5
×
20)
Valve retainer
Pump head
Valve plate
Photo16
DA-41D (K), 81S (K) common procedure
Valve A: White
φ
24 (hard PTFE) Valve holder A: Black
φ
10 (EPDM)
Valve B: White
φ
24 (soft PTFE) Valve holder B: Silver
φ
23 (SUS)
Valve A
Valve holder A
Valve B
Valve holder B
Valve holder A
Valve B
Valve holder B
Valve holder A
Valve B
Valve holder B
Valve holder A
Valve A
Valve A
Valve A
Valve A
S
e
co
n
d
a
ry si
d
e
(inle
t)
S
e
co
n
d
a
ry si
d
e
(e
xh
a
u
st)
S
e
co
n
d
a
ry si
d
e
(e
xh
a
u
st)
S
e
co
n
d
a
ry si
d
e
(
inl
e
t)
F
ir
st
sid
e
(
e
xh
a
u
s
t)
F
ir
st
sid
e
(
in
let
)
F
ir
st
sid
e
(
e
xh
a
u
s
t)
F
ir
st
sid
e
(
in
let
)
(DA-41D(K) valve to be removed in replacement) (DA-81S (K) valve to be removed in replacement)
