Duplex Steel Butterfly Valve, API 609, A890 5A, 8 IN, CL150

Detail Information

Product Name: High Performance Butterfly Valve
Design Standard: API 609 Category B
Body Material: ASTM A890 5A
Size: 8 Inch, DN200
Pressure: Class 150 LB, PN20
End Connection: Lug
Operation: Wormgear

The Fire-Safe High-Performance Butterfly Valve is designed with dual seats to ensure optimal sealing and reliability. The primary seat is constructed from RPTFE (Reinforced Poly Tetrafluoroethylene), providing excellent sealing performance for tight shut-off and preventing leakage. This soft seat material enhances the valve's overall functionality by offering superior sealing properties. In addition, the valve features a fire-safe metal seat, providing enhanced resistance to high temperatures and ensuring reliable operation during fire incidents. The combination of the RPTFE soft seat and the fire-safe metal seat ensures consistent performance in both normal and emergency conditions, making this valve an ideal solution for applications where safety, efficiency, and reliability are critical.

Technical Specification

» 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 Petrochemical industries
» Liquefied Gas and Refrigeration systems
» Heavy Industrial applications
» Power and Co-Generation Plants
» Steel and Iron Works
» Commercial facilities
» Pulp and Paper Mills
» Oil Refineries and Oil Fields
» Shipbuilding
» Hydrocarbon Processing
» Gas Piping systems
» Local Area Energy Supply
» Industrial construction projects
» 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