ASTM A890 5A Butterfly Valve, API 609 CAT.B, 10 Inch, CL300

Product Name: ASTM A890 5A High Performance Butterfly Valve
Design Standard: API 609 Category B
Body Material: ASTM A890 5A
Size: 10 Inch, DN250
Pressure: Class 300 LB, PN50
End Connection: Lug

The fire-safe high performance butterfly valve is engineered with two distinct seats to ensure optimal functionality. The primary seat material is RPTFE (Reinforced Poly Tetra Fluoro Ethylene), which enables the valve to achieve a tight shut-off, effectively preventing any leakage. This soft seat material not only offers excellent sealing properties but also enhances the valve's overall performance. Additionally, the valve is equipped with a fire-safe seat made of metal. This secondary seat provides enhanced resistance to high temperatures and can withstand the rigorous conditions of a fire incident. The combination of the RPTFE soft seat and the fire-safe metal seat guarantees reliable performance in both normal and emergency situations, making this valve an ideal choice for applications where safety and efficiency are paramount.

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: 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.

Application Scope

» Chemical and Petro-Chemical
» Liquified Gas
» Refrigeration
» Heavy Industrial
» Power and Co-Generation Plants
» Steel and Iron Works
» Pulp and Paper Mills
» Oil Refineries and Oil Fields
» Ship Building
» Hydrocarbon Processing
» Gas Piping
» Local Area Energy Supply
» Industrial Construction
» Marine

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: