Balcrank 1120-037 CF50 Buna-N Guía De Servicio Técnico Y Recambio página 13

PUSHING ROD/CENTRAL BUSHING AND SEAL MAINTENANCE
BALL VALVES AND SEATS MAINTENANCE
1. Close fluid valves.
2. Drain the fluid from inside the pump. Anticipate a drainage of fluid from
inside the pump.
3. Remove the inlet and outlet manifolds. Take note of the orientation of the
manifolds.
4. Install a new set of valves or seats according to these assembly drawings.
Tighten the manifold bolts with a maximum torque of 132 lbf·in (15 N·m).
IMPORTANT: Always approximate manifold bolts before final tightening.
5. Assemble the directional valve being careful not to damage the O-rings
and tighten the screws with a maximum torque of 70 lbf·in ( 8 N·m).
CAUTION!
CAUTION WHEN USING PIPE SEALS
CF50 pumps manifold fitted with PTFE (Teflon) O-ring should be tightened
followy the shown sequence.
Alway tighten bolt (1) and (2), firstly to avoid damage the manifold and the seals.
1
6
4
2
AIR SENSOR MAINTENANCE
The air sensors are on the inside part of the diaphragm covers. To access
them, follow the procedure for "Replacing diaphragms".
Once removed the covers following procedure:
1. Remove the side cover
2. Remove the two screws that secure the air sensor to the top.
3. Remove all components of the sensor. Clean the area.
4. Introduce new components in the order shown.
5. Fit the remaining components in reverse order. Fit the side cover and
tighten the screws.
AIR SENSOR KIT: 558527
Balcrank Corporation • Weaverville, N.C. 28787 • Phone (800) 747-5300 • Fax (800) 763-0840
3
5
IMPORTANT:
Follow the diaphragm
maintenance procedure to
ensure no damage in the
diaphragm during its assembly.
Outlet manifold bolts
25 mm (1") long
15 N·m (132 lbf·in)
Hard seat
assembly
Soft Seats
IMPORTANT:
Soft seats don't need extra seals and
the seat is simetric. Balls must be
always assembled over the seat.
Hard seats (PP, POM, PVDF, aluminum,
Stainless steel), use additional o-rings
for sealing. See seat position in the
drawing to ensure correct assembly.
The bigger diameter o-ring is
assembled over the seat and the
smaller one below it.
Inlet manifold bolts are
50 mm (1.96") long
15 N·m (132 lbf·in)
EN
This face
always
downwards
Rev A 07/2017 SB 1147 13