Operation
The valve is self-acting, using the pressure of the service fluid
and the force of the spring on the disc, which closes to prevent
medium reverse flow.
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Application
Self-acting valve which prevents reverse flow
of the service fluid, for use with water, steam,
on special request also for other non-
aggressive liquids and gases for service
pressures and temperatures:
If tightness is required, it is necessary to
install into pipeline also a shut-off valve,
besides the check valve.
Technical description
The valve is head-type. Closing disc is guided
loose in a bonnet and pressed into a rolled seat
by a spring. Flow direction in the valve is
from under the disc.
Connecting and end-to-end dimensions
Outlet and inlet ends of the valve are provided
with pipe threads.
Basic end-to-end and connecting dimensions
are given in the table.
Material
Body, head grey cast iron (42 2420, GG-20)
Disc to DN 32 staiinless steel (13 Cr)
Disc from DN 40
grey cast iron with rolled-in
sealing ring (13 Cr)
Seat stainless steel (13 Cr)
Testing
The valve is tested as per ČSN 13 3060, part 2,
DIN 3230.
Installation
The valve must be installed only in vertical
position with the bonnet upwards.
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