Installation
The valve can be installed in horizontal or vertical piping depending on the
flow direction. Electrically actuated valves should be installed in horizontal
piping with the actuator upwards above the valve. In other positions the
actuator must be supported or attached to a hinge.
Operation
The valve is operated by handwheel (ON 13 3110),chainwheel
(ON 13 3130), electric servomotor or from a stand (ON 13 3140 and
ON 13 3142). Type of electric actuator and maximum pressure drop is
selected by the supplier.
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Application
Shut-off valve for water, steam, on special
request also for other non-aggressive liquids
and gases for temperatures up to 550°C
(depending on valve materials) and service
pressures:
The valve is not suitable for valve regulation.
Technical description
The yoke-type valve has a closing disc which
fits into sealing surface welded into its body.
Stem is sealed with gland packing in the
bonnet. Flow direction in DN 50 valves is
from under the disc. For DN 65 valves the
flow direction is from above the disc and
internal bypass reduces pressure difference
before and after the closing element (pressure
drop).
Connecting, face-to-face and end-to-end
dimensions
Face-to-face dimensions as per DIN 3202 F2.
Flange connecting dimensions as per
DIN2501.
Flange faces as per DIN2526.
End-to-end dimensions of butt-weld end
valves as per DIN 3202. Finish of butt-weld
ends as per DIN 2559.
Basic connecting and face-to-face dimensions
are given in the table.
Material
to -50°C up to 400°C up to 550°C
Body, bonnet
Alloy steel carbon steel alloy steel
42 2714.9 GS-C25 1.7357
Stem stainless steel (13Cr)
Disc
1.0570 1.0570 1.7715
Sealing surfaces
weld overlay weld overlay stellite
(13 Cr) (13 Cr)
Gland packing asbestos-free graphite
Testing
The valve is tested as per DIN 3230.
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