Triple Eccentric Wafer Butterfly Valve, API 609, CF8, DN50

Product Name: Triple Eccentric Wafer Butterfly Valve
Type: Triple Eccentric Butterfly Valve
Design Standard: API 609
Body Material: ASTM A351 CF8
Size: DN50, 2 Inch
Pressure: PN16, Class 150 LB
End Connection: Wafer
Operation: Worm Gear
Medium: Water, Oil, Gas, etc
Temperature Range: -196°C to 550°C

We offer a comprehensive range of Triple Eccentric Butterfly Valves, available in various pressure classes, body styles, and materials to meet critical process requirements across industries such as hydrocarbon processing, power generation, chemicals, and fertilizers. The product range includes valves in ASME classes up to 600 LB and sizes up to 64 inch (1600 mm), with options in carbon steel, stainless steel, and alloy steels—suitable for temperatures up to 538°C (1000°F). Based on customer needs, valves in higher pressure classes, larger sizes, and alternative materials are also available. The range includes options for cryogenic service. These metal-seated valves conform to API 609 standards. Designed for true bi-directional flow and high-integrity sealing, all machining is performed on advanced 5-axis machining centers. Customized welding machines ensure precision manufacturing.

Technical Specification

» Size Range: 2-48 Inch (DN50-DN1200), larger sizes available upon request
» Pressure Ratings: Class 150-600 LB (PN10-PN100)
» Body Material: Carbon Steel (ASTM A216 WCB), Stainless Steel (A351 CF8, CF8M, CF3, CF3M), Low Temperature Steel (A352 LCB, LCC)
» Shaft Material: 17-4PH, SS410, XM-19
» Seat Material: Fully Metal Seat, SS + Graphite Seat
» Operation: Handle, Worm Gear, Pneumatic, Electric
» Temperature Range:
• Metal Seat: -29°C ~ 425°C
• Cryogenic Metal Seat: -196°C ~ 121°C
» End Connections: Wafer, Lugged, Double Flanged, Butt Weld, Grooved
» Actuation Options: Manual, Pneumatic, Electric, Hydraulic, Counterweight, Electro-Hydraulic

Product Features

» Lockable lever for secure manual operation
» Site maintenance-friendly design
» Easy integration with automation systems
» Positive tight shut-off capability
» Optional top flanges conforming to ISO 5211
» Qualified for both gas and liquid service
» Wide selection of body and trim materials for various media
» Standards: ISO 5752, BS 5155, API 609, MSS-SP-68, ASME B16.10, ASME B16.5, DIN 3202

Triple Offset Butterfly Valve

Triple offset metal sealing butterfly valve uses the three eccentric structure with multi-layer metal seal or pure metal sealing ring, different sealing materials are being used according to the different temperature request from end user.The structure of valve sealing ring that was formed after machining for triple eccentric butterfly valve is oblique cone type, the purpose of which is to let the disc open in a subtle angle and seat sealing surface can be completely separated from the sealing surface of disc, thus to reduce the friction of sealing surface during the open and close.

Triple Offset Frictionless Design

• Offset 1: Offset for seat seal and the rotation center of stem.
• Offset 2: Center of pipe and disc.
• Offset 3: Seat sealing angle center line and flow passage center.
• The triple offset of butterfly valve ensures the valve disc is completely separated from seat sealing surface while open in a slightly angle which could reduce the friction of sealing surface during open and close and opening torque as well as prolong the service life of the sealing surface.
• Our metal sealing butterfly valve adopts multi-layer sealing ring to achieve the valve seal, the multi-layer seal ring is generally made of stainless steel and graphite combination The pure metal sealing can be used for special medium or high temperature.

Seat Structure

• Low Operating Torque: Our butterfly valves combine three offsets. Standard sealing is graphite + metal. Optional PTFE + metal combinations are available for different temperatures and media, using flexible laminated metal and graphite to ensure a tight, uniform seal and reduce operating torque.
• Zero Leakage: Laminated seal rings are self-aligning, allowing the valve to meet zero leakage per API 598.
• Fire-Safe Design: Standard valves are not soft-seated and meet API 607 fire-safe requirements.
• Anti-Blowout Shaft: Double anti-blowout design meets API 609 and ASME B31.1.
• Top Retention: Packing gland follower retains the stem.
• Bottom Retention: T-shaped collar prevents stem blowout.

ISO 5211 Top Mounting

Different End Connections Available: