Flowserve BB 1 - Manual (Page 16)

6
Maintenance
BB 1... Changing springs and O-rings
Danger
Note that springs are preloaded, which means that they can jump out of the plate body
when the valve is being installed or removed.
This presents the risk of injuries to hands, arms and face.
GESTRA dual-plate check valves BB ... do not require any special maintenance.
However, in certain cases (cf. “Commissioning”) it might be necessary to replace the springs
or O-rings.
Dual-plate check valve BB ... Undo screws, remove springs and withdraw hinge pins.
Take out springs, semicircular plates,
support plates and, if fitted, O-rings.
Insert new springs with tension plates and
hinge pins.
1 2
3 4