Installation
Butterfly valve can be installed either into horizontal or vertical
pipeline. For valves actuated by a multiturn electric via worm gear drive, the axis
of the electric motor should remain horizontal. If the electric actuator is
fitted with the electric motor above with its axis vertical, the amount of oil
must be increased. The butterfly valve is a two-way valve, but for improved tightness it is installed in piping so that, with the valve
closed, the differential pressure presses the disc into the seat.
Control
The butterfly valve can be operated with a handwheel via a worm gear,
chainwheel or multi-turn electric actuator, or from a stand.Butterfly
valves up to sizes of DN 400 and at pressures of up to PN 10 can be also
operated by a single-turn electric actuator. The type of electric actuator is
selected by the supplier.
|
Application
Shut-off valve used mainly for water, steam,
air and other non-aggressive services for
working pressures and temperatures:
Maximum operational conditions depend on
the physical properties of the sealing
elements.
Technical description
The semi-lenticular disc is eccentrically
pivoted in the valve body on the shafts, which
turn in sliding bearings and are sealed with
"O" - rings. A shaped rubber sealing ring is
held in the disc by means of a thrust ring.
When the valve is closed this sealing ring fits
into the stainless steel sealing seat, which is
fixed in the body.
Connection
Face-to-face dimensions are as per DIN 3202
F4. Flange connecting dimensions as per DIN
2501. Flange faces as per DIN 2526, Form C.
Basic connecting dimensions are given in the
table.
Materials
Body, disc PN 6, PN 10 PN 16
grey cast iron carbon cast steel
GG 20 GS-C25
Seat stainless steel (13Cr)
Shaft stainless steel (13Cr)
Sealing up to 120°C NBR NBR
up to 200°C - VITON
Testing
Swing check valve is tested as per DIN 3230.
|
