172-65316M-08 (MB12A/MB12AF/MB12B/MB12BF) 7 Oct 2021
21
Common Items for Screwed and Flanged Connection Models:
Part
During Disassembly
During Reassembly
Part Inspection
Body Gasket Remove the gasket
and clean sealing
surfaces
Replace with a new gasket if
damaged
—
Valve Seat
(Union/Flang
e Side)
Remove the valve
seat
Replace with a new valve seat
—
Valve Seat
O-ring
Remove the O-ring
Replace with a new O-ring; insert
into the valve seat
—
Washer
Remove the washer
Reinsert the washer
Check for
damage,
deformation, etc.
Belleville
Washer
Remove the Belleville
washer
See the drawing below for the
proper orientation of the Belleville
washer
Check for
damage,
deformation, etc.
Ball
Remove the ball
Reinsert the ball – see the drawing
below for the proper orientation
Check the sealing
area for scratches,
wear, etc.
Valve Seat
(Body Side)
Remove the valve
seat
Replace with a new valve seat
—
Valve Seat
O-ring
Remove the O-ring
Replace with a new O-ring; insert
into the inlet valve seat
—
Washer
Remove the washer
Reinsert the washer
Check for
damage,
deformation, etc.
Belleville
Washer
Remove the Belleville
washer
See the drawing below for the
proper orientation of the Belleville
washer
Check for
damage,
deformation, etc.
Bushing
Remove the bushing Replace with a new bushing
—
NOTE: Clean, then check the inside of the body for scratches, erosion, etc.
Bushing
Body
Belleville Washer
Washer
Valve Seat
Valve Seat
O-ring
Ball
Valve Seat
Washer
Belleville Washer
Body Gasket
Union