Pneumatic butterfly

Features:

Robust and fire-resistant all-metal construction.

Stellite® grade 21 seat overlays provide excellent durability.

Resilient metal seal ring ensures perfect seating force distribution around precision-machined seat circumference.

Easily replaceable multi-layered duplex and graphite seal rings.

Robust one-piece shaft designed to transfer/maintain torque efficiently.

Two-piece packing gland and graphite packing minimize external emission risk.

Key secured shaft-to-disc connection for maximum shaft integrity.

Heavy duty bearings withstand high pressure loads and wear.

Braided graphite bearing protectors prevent dirt intrusion, ensuring constant running torque and valve operability.

Internal and external shaft extrusion risk handling complies with international standards.

Flange spot facing ensures bolting nut and washer planarity, increasing joint reliability and safety.

Open/closed disc references and external disc position indicator simplify installation/removal procedures to API 609.

Specifications:

Sizes DN 80 – 3000 (NPS 3 – 120)

Pressure ratings ASME class 150 – 1500; EN PN 10 – 250

Temperature range -60°C to +450°C (-76°F to +842°F)

Standards API 609, EN 593; ASME B16.34, EN 12516

Design API 609, EN 593; ASME B16.34, EN 12516

Flange ASME B16.5/ASME B16.47; EN 1092-1; ISO 7005

Face to face ISO 5752; EN 558; ASME B16.10; API 609