32
OPERATION AND MAINTENANCE MANUAL
QTS SERIES
Twin Screw Positive Displacement Pump
QTS-M
08
QTS-M
08
MAI
N
T
E
N
AN
C
E
12P
12M
12L
12N
DRAG PIN
13
12L
12H
12G
NOTCH
12K-O
13
9.
Place the O-ring
(12N)
on the static face of
the secondary seal
(12P)
and insert it on the
seal housing
(12L);
match the notches with the
pins on it. Press evenly with both hands until the
element gets completely inside the housing. If
the pins are not aligned with the notches the
element can be damaged; the final position
is given by the spring and the O-ring so there
should be no contact between metal and the
static face of the secondary mechanical seal.
13
. Place the O-ring
(12H)
on the box of the
back cover
(5).
14.
Proceed to place the static face
(12G)
in
the back cover. Make sure the notch is aligned
with the drag pin. There is no physical contact
between the static face and the seal housing,
the O-ring limits the position of the static face.
This step is crucial for the right assembly of the
mechanical seal; failing to do so properly can
cause damage to the mechanical seals and the
rotors.
10.
Continue placing the seal housings (with
seal faces and O-rings) inside the back cover
(5).
11.
Tighten the hexagonal socket head cap
screws
(13)
to secure the seal housing in the
back cover.
12.
Repeat this procedure with the next seal
housing.
12H
12G
12L
DRAG PIN
NOTCH
