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 (V 40 123…) 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
Valve with regulating disc for water, steam, on
special request also for other non-aggressive
liquids and gases for temperatures up to 550°C
(depending on valve material) for service
pressures and temperatures:
Technical description
The valve is yoke-type. Regulating disc fits
into sealing surface welded into the body.
Stem is sealed with gland packing in the
bonnet. Flow direction from under the disc in
DN 65 valves, for DN 80 valves and larger the
flow direction is from above the disc and
internal bypass reduces pressure difference
before and after the closing element (pressure
drop).
Connecting and end-to-end dimensions
Butt-weld end finish as per ČSN 13 1075,
DIN 2559. End-to-end dimensions as per
ČSN 13 3051.
Basic connecting and end-to-end dimensions
are given in the table.
Material
up to 400°C up to 550°C
Body, bonnet carbon steel alloy steel
GS-C25 1.7357
Stem stainless steel (13Cr)
Disc 1.0570 1.7715
Sealing surfaces weld overlay stellite
(13Cr)
Gland packing asbestos-free graphite
Testing
The valve is tested as per ČSN 13 3060, part 2,
DIN 3230.
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