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4) Replacing DA-241S series Valves
It is recommended that these valves be replaced at the same time as the diaphragms.
Use tools 1, 2, 5, and 6 listed above.
(1) Remove the pump head, valve retainers, and valves as described in 3) Replacing
DA-121D series Valves, steps (1)~(3).
(2) Fit a new A valve to the pump head stage 1-1 inlet, and the pump head stage 1-2 inlet
(mark facing downwards). See Photo 10.
Note: Check that the valve is not back to front. (Refer to Photo 10.)
(3) Place a new C valve on the pump head stage 1-1 outlet and stage 1-2 outlet, and fit a B
valve retainer and A valve retainer to each in that order.
See Photo 10-1.
(4) Fit the valve retainer to the pump head in the position shown in Photo 9, and tighten
diagonally opposite pairs of hex socket head screws (M5×16) equally. See Photo 7.
Note: Check that the O ring is flattened to the extent that it is no longer visible when
viewed from the side.
(5) Fit the pump head to the pump while referring to 2) Replacing DA-121D series and
DA-241S series Diaphragms.
Photo 8-3 121D series Stage 2
C valve(no mark)
B valve retainer (×2)
A valve retainer
Outlet
Outlet
Outlet
Stage 2
Stage 2
Stage 2
Photo 9
Stage 1-2
Stage 1-1
Valve retainer 2-2
Valve retainer 2-1
Photo 10
Stage 1-2
Stage 1-1
A valves
(one each)
Outlet
Outlet
Inlet
①
C valve (one each)
②
B valve retainer (one each)
Inlet
A valve
retainer
mark facing
downwards
Photo 10-1
Stage 1-2
Stage 1-1
Stage 1-2
Stage 1-1
Stage 1-2
Stage 1-1
Inlet
Inlet
Inlet
C valve
B valve retainer
A valve
retainer
Outlet
Outlet
Outlet
