| Description
Dovetailed section fixed metal seat ring, offset shaft and
off-centering ellipse diaphragm form the triple-off-centering
structure. The metal-to-metal sealing between diaphragm and seat,
between seat and valve body are realized through advanced design
ideas and technologies.
Floating seat can automatically adjust anastomosis with diaphragm
when valve is closed, compensating the clearance caused by tem
perature changing, erosion and corrosion to keep bi-direction
sealing.
No contact between seat and diaphragm when valve is open,
eliminating the upper/lower seat corrosion due to frequent on-off.
Novel material for complete metal sealing face for long
trouble-free duration.
Standard
ANSI B16.34valve-flanged and welding end
ANSI B16.5Pipe flanges and flanged fittings
ANSI B31.1Power piping
ANSI B31.3 Process piping
ANSI B31.4 Pipeline transportation systems for liquid hydrocarbons
and other liquids.
ANSI B31.8 Managing system Integrity of Gas pipelines
ANSI FCI10.2 Control valve seat leakage system
MSS SP-25 valves fitting flanges and Unions
MSS SP-55 Quality standard for steel castings for valves, Flanges,
and fittings and other piping components.
GB 12238Butterfly valves: Flanged and wafer-type connection.
GB 12221 Metal valves for use in flanged pipe systems-face to face
and centre to face dimensions.
JB/T 8527 metal seal butterfly valves.
API 598 Valve Inspection and testing
API 609Butterfly valves: Flanged and wafer-type
NACE MR-0175 Metals for sulfide stress cracking and stress
corrosion cracking resistamce
in sour oil field enuiroments
Description
Fireproof structure of valve
Valve is tested of fire burning according to API 607 and the second
part of BS 6755 standards, to ensure stem installation with sealing
ability when burnt Set hoop mounted on upper of stem, to prevent
the upper part of stem from falling through the set hoop even when
stem is broken in valve accidentally
Replaces the seat only after removing the embedded parts, no
requirement of removing diaphragm and stemExcellent performance of
shutoff and flow control
Excellent flow control ability
Large range of flow control
Reliable sealing even used as flow controller
Available as dead-end of flange valve
System support for ensuring of quality
One stop of purchasing for valves, drive devices and accessories
Electrical, worm wheeled, double acting air-operated, spring return
air-operated devices, cooperating with accessories such as travel
stop switch, solenoid valve and localizer
Experienced service center to ensure high quality maintenance
Large applicable range with all kinds of materials to be selected
General valve materials includes carbon steel, stainless steel, or
even Monel metal when necessary
Technical data
Valve type: WDV521/5210 of round disc butt clamp structure /
DDV521/5210 with flange butt clamp structure
FDV521/5210 with flange connection structure
Valve specification: DN50~800（L）/ DN50~1000（LT）/ DN50~1000（F）
Pressure level: Pn10 Pn16 Pn25 Pn20（class 150）
Valve testing: GB/T13927 D grade, ISO 5208 1st grade, ANSI V grade
Valve body shell testing pressure: 1.5× maximum rating pressure
Valve sealing testing pressure1.1× maximum rating pressure |
