PRODUCT INFORMATION
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DESIGN FEATURES
Body and Bonnet
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The body is cast
construction with uniform sections and generous radius fillets to
prevent stress on all sides, The body is spherical in shape to prevent
minimum turbulence, erosion and resistance to flow, Bonnet flange and
yoke are designed to have sufficient strength against stem thrust force,
The bolted bonnet is fitted with a back seat ring, The body-bonnet
joint is male-female type and circular in shape, Gasket materials can be
supplied according to customer's requirement.
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Disc
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The
plug type disc is normally provided. This disc rotates freely on the
stem and incorporates a differential angle from that on the seatring.
This design provides the maximum assurance of shut off and is less
likely to stick in the body seat, The disc is retained to the stem by a
disc lock nut. The guide bar on the upper side of the disc is guided
through a bridge cast integral with the seat ring, assuring better
arrangement and uniform seating at all times. Long guide hole in seat
ring can always make centering of disc.
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Seat Ring
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The
seat ring with a wide taper area provides ample seating. The slot on
the seat ring allow easy removal for servicing at site. Three type
designs are supplied: integral with body, threaded in body and seal
welded on body. They are designed to eliminate resistance to flow.
Seating area has proper structure to seal with disc.
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Stem
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The fine
machined and ground finished stem is fitted to the disc by a disc lock
nut, Rotating and rising designed stems are normally supplied but a
non-rotating type is available as requested by the customer. The accuracy
in the dimensions and finishes assure along hie with a perfect tightness in the packing area. All stem shave the turning and rising cut ACME threads.
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Packing
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The
packing is designed and arranged to ensure a maximum seal along the
stem during operation or while at position, thus allowing for a greater
reduction in fugitive emissions.
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Gland
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The
packing gland design is a two-piece self-aligning type. The gland is in
contact with the packing which is connected to gland flange through a
spherical joint, The gland has a shoulder to restrict the complete entry
into the stuffing box. This pavticulardesign permits a correct pressure
on the packing without any damage to stem due to friction or corrosion.
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Stuffing Box
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The
stuffing box is designed to extend the life of packing rings, Class 300
and above valves are equipped with a lantern ring between the packing
rings.
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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 B16.5RF.ASME class 600 valves resupplied with RTJ end
flanges on request.
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Operation
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All
waives are offered with hand wheel, gear operator, or
actuators(electric, Hydraulic, or pneumatic) according to customer's requirements.
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PART LIST AND STANDARD MATERIAL SPEC
Standard Material Specifications
Part Name
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Cast Steel Valves
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Stainless Steel Valves
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WCB
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LCB
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CF8M
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CF8
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CF3M
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Body
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A216-WCB
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A352-LCB
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A351-CF8M
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A351-CF8
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A351-CF3M
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Disc
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A217-CA15
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A351-CF8
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CF8M
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A351-CF8
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A351-CF3M
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Seat Ring
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A105+CA15
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A182-304
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Integral
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STem
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A479-410
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A479-304
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A479-316
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A179-304
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A479-316L
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Disc Lock Nut
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A479-410
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A479-304
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A479-316
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A179-304
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A479-316L
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Back Seat Ring
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A479-410
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A479-304
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Integral
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Bonnet
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A216-WCB
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A352-LCB
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A351-CF8M
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A351-CF8
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A351-CF3M
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Bonnet Bolt
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A193-B7
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A320-L7
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A193-B8
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Bonnet Nut
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A194-2H
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A194-4
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A194-8
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Packing Gland
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A479-410
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A479-304
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A479-316
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A479-304
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A479-316L
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Hinge Pin
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A576-1020
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A479-304
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Gland Bolt
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A307-B
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A193-B8
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A193-B8
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Gland Flange
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A105
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A351-CF8
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Gland Bolt Nut
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A307-B
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A194-B8
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A194-8
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Yoke Bolt
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A439-D2C
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A439-D2C
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Handwheel
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A536
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A536
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Handwheel Nut
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A576-1020+Cr.Plating
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A351-CF8
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