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Assembling the pump heads – VACUUBRAND PC 3012 VARIO plastic housing User Manual

Page 116

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page 116 of 129

Assemble the original number of washers

(H) between diaphragm support disc (G)

and connecting rod (I).

Screw diaphragm clamping disc (E), dia-

phragm (F), diaphragm support disc (G)

and washers (H) to connecting rod (B).

Optimum torque for the diaphragm support disc: 4.4 ft

.

lb

f

(6 Nm), it is

recommended to use a torque wrench. Attach Allen key to diaphragm

key (hexagonal bolt 6 mm wide).

Note: Never use the diaphragm key with any additional tools like tongs

or Allen keys without appropriate torque limitation.

F

E

Assembling the pump heads

Place the pump in a way that the pump head to be assembled is at the

top. Support the pump appropriately.

Bring the diaphragm (F) into a position in which it is in contact with the

housing (J) and centered with respect to the bore.

Place the head cover (D) over the diaphragm. Check for its correct

orientation by aligning it beforehand with the housing cover which has

to be put over it later on.

+

Pay attention that the diaphragm (F) stays positioned centrally so that

it will become clamped uniformly between housing (J) and head cover

(D).

Place the valves (B) and the O-rings (C) at

their respective positions on the head cover

(D).

+

Make sure that the valves are correctly

seated. See figure for the correct position of

the valves: Valves at the outlet with round

centered opening (S) under valve; valves at

the inlet with kidney-shaped opening (T) be-

side valve.

Place the housing cover (A) with housing

cover insert onto the head cover.

S

T