Operation
The valve can be closed by handwheel. When the stem is in its
uppermost position, the valve works automatically, using the pressure of
the service fluid on the disc, which closes to prevent reverse medium
flow.
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Application
Shut-off check 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:
Technical description
The valve is yoke type. Disc fits into a rolled
seat In a body. The disc is guided loose on the
stem. Stem is sealed with gland packing in the
yoke. Flow direction in the valve is from
under the disc.
Connecting and face-to-face dimensions
Flange connecting dimensions as per
ČSN 13 1060 and ČSN 13 1061, DIN 2501.
Face-to-face dimensions as per ČSN EN 558,
DIN 3202 F1.
Basic face-to-face and connecting dimensions
are given in the table.
Material
Body, yoke grey cast iron (42 2420, GG-20)
Disc to DN 50 stainless steel (13 Cr)
Disc from DN 65 grey cast iron
(42 2420, GG-20)
Sealing surface stainless steel rings
Stem stainless steel (13 Cr)
Gland packing asbestos-free fibre
Testing
The valve is tested as per ČSN 13 3060, part 2,
DIN 3230.
Installation
The valve can be installed only into horizontal
pipeline with handwheel upwards.
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