API 609 Wafer Butterfly Valve, ASTM A216 WCB, 4 Inch, CL300

Product Name: API 609 Wafer Butterfly Valve
Type: High Performance Butterfly Valve
Design Standard: API 609
Body Material: ASTM A216 WCB
Disc Material: ASTM A351 CF8M
Seat Material: SS 316L (or Customized)
Size: 4 Inch, DN100
Pressure: Class 300 LB, PN50
End Connection: Wafer
Operation: Worm Gear

Wafer-Type Soft Seat High Performance Butterfly Valves are designed for demanding applications and have proven effective in extreme service conditions. These valves are suitable for high-temperature services, throttling steam control, polymerizing media, liquor services with entrained solids, high-cycle industrial gas, process gas-off applications, paper stock isolation, vacuum pump isolation, corrosive chemical service, fire-safe refinery and chemical service, heat transfer service, and throttling hydrocarbon service.

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
   JIS 10K-20K
» Body Connection: Wafer Type
» Body Materials (Standard): SS 316, ASTM A216 WCB, Alloy 20, Monel, CD3MN, Hastelloy C-276, etc
» Stem Material: 17-4PH
» Packing Material: Graphite
» Manual Operator: Worm Gear
» Shutoff Rating: Class V
» Temperature Range: -29°C to 425°C
» Medium: Water, gas, oil, etc.

Application Scope

» Chemical / Petrochemical
» Liquefied Gas / Refrigeration
» Heavy Industrial
» Power / Co-Generation Plants
» Steel and Iron Works
» Commercial
» Pulp and Paper Mills
» Oil Refineries and Oil Fields
» Shipbuilding
» 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: