Triple Offset Butterfly Valve, API 609, A351 CF8, 8 IN CL150

Product Name: Metal Seated Triple Offset Butterfly Valve
Design Standard: API 609
Body Material: ASTM A351 CF8
Size: DN200, 8 Inch
Pressure: PN16, Class 150 LB
End Connection: Flanged
Operation: Worm Gear

We offer a comprehensive range of Triple Eccentric Butterfly Valves in various pressure classes, body styles, and materials, designed to meet critical process requirements across industries such as hydrocarbons, power generation, chemicals, and fertilizers. The product range includes valves in ASME classes up to 600 LB, with sizes up to 64 Inch (1600 mm), and materials such as carbon steel, stainless steel, and alloy steels, suitable for temperatures up to 538°C (1000°F). Valves in higher pressure classes, larger sizes, and other materials are available based on customer requirements. The range also includes valves for cryogenic services.

The metal-seated valves conform to API 609, and the Triple-Offset Butterfly Valves are truly bi-directional, offering high-integrity sealing. All machining operations are performed on 5-axis machining centers, and customized welding machines are used in the manufacture of these products.

Technical Specifications

» Size Range: 2-64 Inch (DN50-DN1600) (Larger sizes upon request)
» Pressure Ratings: Class 150-600 LB (PN10-PN100)
» Body Material:
   Carbon Steel (ASTM A216 WCB)
   Stainless Steel (ASTM A351 CF8/CF8M/CF3/CF3M)
   Low Temp Steel (ASTM A352 LCB/LCC)
» Shaft Material: 17-4PH, SS 410, XM-19
» Seat Material: Fully metal seat, SS + Graphite Seat
» Operation: Handle, Worm Gear, Pneumatic, Electric
» Temperature Range:
   Metal Seat: -29°C to 425°C
   Metal Seat (Cryogenic): -196°C to 121°C
» End Connections: Wafer, Lugged, Double Flanged, Butt Weld, Grooved
» Actuators: Manual, Pneumatic, Electric, Hydraulic, Counterweight, Electro-hydraulic
» Medium: Water, Gas, Oil, etc.

Product Features

» Lockable Lever
» Site Maintenance
» Ease of Automation
» Positive Tight Shut-Off
» Optional Top Flanges to ISO 5211
» Qualified for Both Gaseous and Liquid Services
» Broad Line of Body and Trim Materials for a Variety of Medium Services
» Compliance with International 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: