Description
Technical Specifications
SPECS Triple Eccentric Butterfly Valve. The valve utilizes unique triple eccentric structure. Zero friction will emerge between the valve plate and the sealing ring. Triple-offset Butterfly Valves, shaft offset is created by designing the valve with the shaft located behind the centerline of the sealing surface (offset1) and slightly to one side of the pipe centerline (offset2). The third offset is point of intersection of tangents of seat and disc sealing deviating from the disc face. These offets are to completely eliminate all disc to seat friction throughout the valve’s entire 90 degrees of rotation. Metal seal, laminated seat are optional. The triple-offset provides ANSI ClassIV, V, VI leakage performance. The seat seal ring can be changed easily from the body.
Applicable Standard
Design & Manufacture Standard: API 609
Face to Face: API609, BS EN 558, DIN3202, ISO 5752
End Connection: DIN, BS, UNI, ISO, ANSI, AS, JIS
Test Standard: API598
Products Range
Size: 2"~40"
Pressure Rating: 150-600LB
Body: Carbon Steel, Stainless Steel, Nickel Aluminum Bronze
End: Wafer, Lug, Flange, BW
Operation: Manual, Pneumatic, Electric
Design Features
Triple Offset Frictionless Design
Offset 1: The shaft is offset from seat
plane, allowing a continuous seating surface.
Offset 2: The shaft centerline is offset from disc centerline to lift the disc rapidly off and away from the seat when the valve is open.
Offset 3: The cone axis is offset from seal
centerline, eradicating disc-seat friction.
Low operating torque
SPECS Triple Eccentric Butterfly Valves combine three offsets with flexible laminated metal and graphite to assure a tight and uniform seal and reduce operating torque.
Anti-blowout Shaft
Double anti-blowout design satisfies API
609 and ASME B31.1 requirements through both internal and external stem
retention.
Top Retention: Packing gland follower retains the stem integral collar.
Bottom Retention: T shaped attachment prevents stem blow-out.
Zero Leakage
Laminated seal rings are designed to self align and allow valves to meet zero leakage per API 598.
Fire Safe Design
Triple Offset Butterfly Valves are not soft seated and can fulfill the fire-safe requirements of API 607.
Low Emission Shaft Seal
SPECS can supply low-emission stem seal
with leakage rate up to 20 ppm*.
a.) Shaft is fully guided by shaft bearing
& gland follower to reduce side load due to line pressure thrust.
b.) The packing set is pre-corn pressed and
is a combination of braided graphite rings and die formed flexible graphite
rings.
c.) Controlled
Ra0.4~Ra0.8 finish on the shaft and Ra1.6 on the stuffing box provides optimum
packing and shaft sealing.
d.) Optional Live Loaded gland flange
available to provide constant packing compression to reduce fugitive emissions.
e.) Optional shaft seal design available
per Shell MESC 77/312 & TA-Luft.
* 20ppm per sniffing method with helium gas.
Compact Design
SPECS Triple Eccentric Butterfly Valves are designed to API 609 and offers flow control solution in a compact design. It provides a light weight solution to bulky gate, globe, and Ball Valves when space or weight are at a premium.
Triple Eccentric Butterfly Valve Construction
The Explosion View Of Triple Offset Butterfly Valve
