Production Range
API603/ASME 16.34
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API600/BS1414
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Class
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Size
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Class
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Size
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150
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2"~ 12"
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150
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2"~ 24"
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300
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2"~ 12"
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300
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2"~ 16"
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600
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2"~ 12"
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600
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2"~ 12"
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900
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2"~ 12"
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1500
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2"~ 12"
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Design Standards
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Pressure-Temperature rating
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ANSI B16.34
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Face to Face Dimensions
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ANSI B16.10
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End Flange Dimensions
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ASME B16.5
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Testing
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API 598/MSS-SP-41
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Bonnet Bolt
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ASTM A193
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Bonnet Nut
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ASTM A194
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Marking
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MSS-SP-25
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Light wall Thickness
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API 603/ANSI B16.34
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Heavy Wall thickness
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API 600/ BS 1873
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DESIGN FEATURES
Body and Cover
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The
body is cast with uniform sections and generous radius fillets to
prevent stress on all sides, The body is spherical in shape toprevent
minimum turbulence, erosion and resistance to flow, Thebody-cover joint
is maㅣe-female in ASME class 150-600 and ringtype joint in class 900 and
over, The cover material is identical tothe body. The check valves are
designed to give resistanceagainst water hammer caused by a sudden
reverse flow. Gasketmaterials can be supplied according to customer's
requirement.
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Disc
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The
disc is constructed to have one piece to endure severe sepvice
conditions. It has a sufficient seating surface area which isground and
lapped to a mirror finish. The disc is of one-piececonstruction and is
heat treated to deliver the required mechanicalproilerties and hardness.
It is securelv fastened to the hinge bymeans oi a lock nut with a
cotter pin.
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Seat Ring
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The
seat rings are designed to prevent any turbulence and damage by
corrosion. They are forged or rolled in one piece andthen seal welded
and overlaid, if required. The forged seat ring isheat-treated to
deliver the best mechanical properties andrequired hardness.
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ARM
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The disc
stability is maintained while the disc is lifted by a hydrodvnamic force
at a flow including pulsating, The arm isdesigned to minimize water
hammer because the disc goes toseat immediately upon cessation of flow
due to heavy balancedweight.
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Hinge
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The
hinge is designed to eliminate body penetration and allow ease of
maintenance because all parts are accessible from thetop, Body
penetra4ion is sealed with blind flange and spiral-woundgasket. The
hinget pin is located near the disc center of gravityresulting in
minimlzlng sealing surface radius rotation and velocity.
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End Connections
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The standard
flange ends have a raised face serrated finish type which conforms to
ASME B16.5 RF ASME class 600 valves aresupplied with RTJ end flanges on
request.
PART LIST AND STANDARD MATERIAL SPEC
Standard Material Specifications
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