Shut-off check valve - Z 25 111-540 PN 40


 

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 carbon steel
(42 2643.1, GS-C25)
Stem stainless steel (13 Cr)
Disc to DN 50 stainless steel (13 Cr)
Disc from DN 65 carbon steel with 13 Cr
overlay
Body sealing surface weld overlay 13 Cr
Gland packing asbestos-free graphite

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.

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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