ASTM A890 5A Butterfly Valves, API 609, 8 Inch, CL150, Lug

Mar 03, 2025

Product Name: API 609 Triple Eccentric Butterfly Valve
Design Standard: API 609
Body Material: ASTM A890 5A
Size: 8 Inch, DN200
Pressure: Class 150 LB, PN20
End Connection: Lug
Operation: Worm Gear

We provide a wide selection of Triple Eccentric Butterfly Valves designed to meet critical process requirements across industries such as hydrocarbon, power, chemicals, and fertilizers. The product range spans ASME pressure classes up to 600 LB and sizes up to 64 Inch (1600 mm), made from materials like carbon steel, stainless steel, and alloy steels. These valves are suitable for operating temperatures up to 538°C (1000°F), with options available for higher pressure classes, larger sizes, and specific materials based on customer requirements. We also offer valves designed for cryogenic services. The metal-seated versions conform to API 609 and feature true bi-directional capabilities for high-integrity sealing. All machining is done on advanced 5-axis machining centers, and customized welding machines are used to ensure precision in manufacturing.

Technical Specifications

» Size Range: 2-40 Inch (DN50-DN1000) (Larger sizes upon request)
» Pressure Ratings: Class 150 LB (PN10, PN16)
» Body Material: ASTM A890 4A, 5A, 6A
» Shaft Material: MONEL K500
» Seat Material: Fully metal seat, SS + Graphite Seat, PTFE Seat
» Operation: Handle, Worm Gear, Pneumatic, Electric
» Temperature Range:
Metal Seat: -29°C to 425°C
PTFE Seat: -29°C to 150°C
» End Connections: Wafer, Lugged, Double Flanged, Butt Weld, Grooved
» Actuators: Manual, Pneumatic, Electric, Hydraulic, Counterweight, Electro-hydraulic
» Medium: Water, Gas, Oil, etc.

Product Features

» Lockable Lever for secure operation
» Site Maintenance for easy upkeep
» Ease of Automation for efficient integration
» Positive Tight Shut-off for reliable sealing
» Optional Top Flanges to ISO 5211 for mounting flexibility
» Qualified for Both Gaseous and Liquid Services to accommodate a variety of applications
» Broad Line of Body and Trim Materials for different medium services
» Compliance with ISO 5752, BS 5155, API 609, MSS-SP-68, ASME B16.10, ASME B16.5, DIN 3202 standards

Triple Offset Butterfly Valve

Triple offset metal sealing butterfly valve uses the three eccentric structure with multi-layer metal seal or pure metal sealing ring, different sealing materials are being used according to the different temperature request from end user.The structure of valve sealing ring that was formed after machining for triple eccentric butterfly valve is oblique cone type, the purpose of which is to let the disc open in a subtle angle and seat sealing surface can be completely separated from the sealing surface of disc, thus to reduce the friction of sealing surface during the open and close.

Triple Offset Frictionless Design

Offset 1: Offset for seat seal and the rotation center of stem.
Offset 2: Center of pipe and disc.
Offset 3: Seat sealing angle center line and flow passage center.
The triple offset of butterfly valve ensures the valve disc is completely separated from seat sealing surface while open in a slightly angle which could reduce the friction of sealing surface during open and close and opening torque as well as prolong the service life of the sealing surface.
Our metal sealing butterfly valve adopts multi-layer sealing ring to achieve the valve seal, the multi-layer seal ring is generally made of stainless steel and graphite combination The pure metal sealing can be used for special medium or high temperature.

Seat Structure

Low Operating Torque: Our butterfly valves combine three offsets. Standard sealing is graphite + metal. Optional PTFE + metal combinations are available for different temperatures and media, using flexible laminated metal and graphite to ensure a tight, uniform seal and reduce operating torque.
Zero Leakage: Laminated seal rings are self-aligning, allowing the valve to meet zero leakage per API 598.
Fire-Safe Design: Standard valves are not soft-seated and meet API 607 fire-safe requirements.
Anti-Blowout Shaft: Double anti-blowout design meets API 609 and ASME B31.1.
Top Retention: Packing gland follower retains the stem.
Bottom Retention: T-shaped collar prevents stem blowout.