API 609 CAT.B Butterfly Valve, ASTM A890 5A, 6 Inch, 150 LB

Product Name: API 609 Category B High Performance Butterfly Valve
Design Standard: API 609 Category B
Body Material: ASTM A890 5A
Size: 6 Inch, DN150
Pressure: Class 150 LB, PN20
End Connection: Lug
Operation: Worm Gear

The fire-safe high-performance butterfly valve is designed with two distinct seats to ensure optimal functionality. The primary seat is made of RPTFE (Reinforced Poly Tetra Fluoro Ethylene), which provides a tight shut-off and effectively prevents leakage. This soft seat material offers excellent sealing properties, enhancing the overall performance of the valve. Additionally, the valve is equipped with a fire-safe metal seat, providing superior resistance to high temperatures and ensuring reliability under fire conditions. The combination of the RPTFE soft seat and the fire-safe metal seat guarantees consistent performance in both normal and emergency situations, making this valve an ideal choice for applications where safety and efficiency are critical.

Technical Specification

» High Performance Butterfly Valve
» Design: Bi-Eccentric
» Normal Size Range:
   Class 150 LB: 2-60 Inch
   Class 300 LB: 2-48 Inch
   Class 600 LB: 2-24 Inch
» Normal Pressure Rating: Class 150-600 LB, PN10–PN40, 10K–20K
» Standard: API 609 Category B
» Body: ASTM A351 CF8, CF8M, CF3, CF3M, A890 4A, 5A, 6A
» Disc: ASTM A351 CF8, CF8M, CF3, CF3M, A890 4A, 5A, 6A
» Seat: SS 316L + RPTFE
» Shaft: 17-4PH
» Shutoff Rating: Class VI, Bubble Tight
» Operation: Handle, Worm Gear, Pneumatic, Electric
» Temperature Range: Soft Seat: -29°C to 150°C
» Medium: Water, Gas, Oil, etc.

High-performance Butterfly Valve Applications

» Chemical and Petrochemical Industries
» Liquefied Gas and Refrigeration
» Heavy Industrial Applications
» Power and Co-Generation Plants
» Steel and Iron Works
» Commercial Applications
» Pulp and Paper Mills
» Oil Refineries and Oil Fields
» Shipbuilding
» Hydrocarbon Processing
» Gas Piping Systems
» Local Area Energy Supply
» Industrial Construction
» Marine Applications

Double Offset Butterfly Valve

The Double Offset High-Performance Butterfly Valve is a new type of butterfly valve designed by absorbing the advantages of several different structural butterfly valves. The sealing surface of the valve plate is a spherical arc surface. The sealing mechanism achieves a true dynamic seal through system pressure, thus providing reliable sealing performance and durability. It features a small volume, light weight, wide manufacturing range, and is easy to maintain and repair. Due to its double offset butterfly plate design and single-piece flexible lip-shaped sealing seat, it is ideal for applications requiring reliable sealing and good regulating characteristics. It can be used for quick shut-off or regulating flow.

Double Offset Frictionless Design

• 1st offset: Shaft is positioned downstream from the centerline of the seat.
• 2nd offset: Shaft is off center from the vertical axis of the seat.
• ISO 5211 Top Flange
• In addition to standard, durable V-ring packing, you can also choose from optional graphite
• high temperature packing or emissions control packing.
• Bi-Directional, Shut off performance
• Seat Options: Rubber, PTFE, RPTFE, or Fire Safe PTFE
• The double offset operating principle minimizes seat wear and lowers operating torque to
• improve durability.
• Positive sealing is mechanically achieved and does not rely on line pressure assistance.

Seat Structure

Double Offset PTFE Seat Butterfly Valve

• A surplus of material between the PTFE Seat and Disc ensures a reliable seal in a low pressure environment.
• In high pressure situations, the force of the medium pushes against the seat contacting the sealing surface for a stronger seal.
• The disc surface has a conical design to reduce frictional force. The valve seat can also be replaced or repaired easily.

Double Offset Fire Safe PTFE Butterfly Valve

• Fire Safe valve seat with dual seal includes a primary PTFE seat insert and metal seat. 
• In the event that the PTFE insert is destroyed, the secondary metal seat provides an effective shut-off. 

Shaft Retention

• Externally retained, double blowout proof stem design as API 609
• External: Shaft is designed with an integral collar and gland follower to prevent blowouts.

Zero Leakage

• Disc-Seat sealing is achieved by evenly loading torque force onto the disc's laminated seal

ISO 5211 Top Mounting

Different End Connections Available: