Design, Butt Weld Ends

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Low Pressure Steel
Swing Check Valves
Sizes 2” – 20”
ASME B16.34 – 1996
Valve overall lengths to
ASME B16.10 – 1992
Pressure Class: 300, 600
Features & Benefits
Excellent Reliability
● Welded-in seats hard-faced with Stellite ® or
Equivalent
● Robust fixing of disc prevents possibility of failure
(no fixng nut)
● No external bearings or seals
● Aluminium reinforced graphic gasket
Typical Applications:
● Main Steam Service
● Boiler Feed Pump Protection
● L.P. Feed Heaters
● Blow Down Service
● Blow Off Service
● Gland Steam System Drains
● Steam Turbine Inlet
● Economizer Recirculation
● Spray Water
● Attemperator Spray
● Steam Blow and Start Up
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The disc holder is supported by a hinge pin
which is mounted in an integral lug on the
valve seat, this arrangement eliminates the use
of external seals or glands. The hinge pin is
free to move in both components thus
reducing the possibility of seizure in service.
The disc is securely attached to the disc holder
by a locking wire which allows self alignment
of the disc on the seat, thus ensuring tight shut
off on reversal of flow. This feature eliminates
the use of locknuts or split pins, therefore
preventing possible failure in service.
Welded in seat ring Stellite ® faced.
Bolted bonnet with Aluminium reinforced
Graphoil Gasket. This range of valves
incorporates, as standard expanded graphite
joints located in tongue and groove
configuration between the body and bonnet.
The bonnet bolts are loaded to pre-determined
values to ensure a pressure tight seal.
Self aligning disc Stellite ® faced.
The Dewrance modular design body
accomodates a wide range of flanged and
welded connections. Even unusual size
requirements can be commonly met without
difficulty.
Low Pressure Steel
Swing Check Valves
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