ASTM B148 C95800 Butterfly Valves, 8 Inch, 150 LB, Lug Ends

Product Name: ASTM B148 C95800 Butterfly Valves
Type: Double Offset Butterfly Valve
Body Material: ASTM B148 C95800
Size: 8 Inch, DN200, 200 mm
Pressure: Class 150 LB, PN20
Operation: Gearbox
End Connection: Lugged
Temperature Range: -29°C to 150°C

The lug-type, double-offset high-performance butterfly valve in bronze is a versatile and durable solution designed for a wide range of industrial applications. Its bi-directional design, combined with a blow-out proof shaft, ensures safe and reliable operation even under extreme conditions. The valve can be configured with multiple seat options, including soft seat, metal seat, and fire-safe seat, allowing customization to meet specific process requirements. This adaptability enhances performance, ensures compatibility across diverse systems, and provides long-term operational reliability. With its robust construction and flexible features, the bronze high-performance butterfly valve delivers efficient flow control and is widely employed across numerous industrial sectors.

Technical Specification

» Size Range:
  Class 150 LB: 2-60 Inch
  Class 300 LB: 2-48 Inch
  Class 600 LB: 2-24 Inch
» Pressure Rating: Class 150-600 LB, PN10-PN40, 10K-20K
» Design Type: Double Offset
» Standard: API 609 Category B
» Body Material: Aluminum Bronze (ASTM B148 C95800, C83600, B584 C84400, ASTM B62)
» Disc Material: Aluminum Bronze (ASTM B148 C95800, C83600, B584 C84400, ASTM B62)
» Shaft Material: MONEL K500
» Shutoff Rating: Class VI, Bubble Tight
» Certifications: API 607, PED
» Seat Design: Unique Valve Seat Design
» Optional Seat Materials: RTFE
» Operation Options: Handle, Worm Gear, Pneumatic, Electric
» Temperature Range:
  Soft Seat: -29°C to 260°C
  Metal Seat: -51°C to 550°C
  Metal Seat (Cryogenic): -196°C to 121°C
  Fire Safe Seat: -51°C to 550°C
» End Connections: Wafer, Lug, RF Flange
» Medium: Sea Water, etc. 

Application Scope

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

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: