Flowseal High Performance Butterfly Valves – Crane – ASME Class 150/300/600

Flowseal high performance butterfly valves from Crane are engineered for demanding industrial applications requiring reliable bi-directional shutoff. These valves feature a patented seat design that provides bubble-tight sealing from vacuum conditions up to full ASME Class 150, 300, and 600 cold working pressures.

The unique self-energized seat mechanism uses an encapsulated elastomeric O-ring core that creates a mechanical pre-load between the disc and seat at low pressures. As line pressure increases, the seat dynamically compresses against the disc edge, delivering tighter sealing at higher pressures. This design minimizes seat wear and reduces operating torque over the valve's service life.

Flowseal valves are manufactured under ISO 9001 quality assurance and are Pressure Equipment Directive (PED) certified. CE marking is available on request. The valves are offered with multiple actuation options including electric, pneumatic, vane actuators, and manual gear operators.

Flowseal high performance butterfly valves are installed across a wide range of process industries:

- Hydrocarbon processing and chemical/petrochemical plants - Power generation and utilities - Water and wastewater treatment facilities - Pulp and paper manufacturing - HVAC systems in large commercial and industrial buildings - Marine and commercial shipbuilding - Food and beverage processing - Specialty applications including snowmaking systems

Contact PC Engineering for pricing, availability, and technical support for Crane Flowseal High Performance Butterfly Valves. Call us or fill in our inquiry form — our engineers will respond within 24 hours.