Concentric Butterfly Valve / Rubber Lined Valves

Specification Item	Technical Details & Standard Features
Design Standards	API 609 Category-B, MSS SP-67, ASME B16.34, EN 593
Size & Pressure Range	NPS 2″ ~ 120″ (DN50 ~ DN3000); Class 150LBS ~ 900LBS
Body Types	Wafer, Semi-Lug, Full Lug, Double Flanged Ends
Sealing Mechanisms	Double offset resilient/PTFE seat or Triple offset conic elliptical zero-friction metal to-metal seat.
Laminar Seals	SS316 + Graphite, Duplex UNS S31803 + Graphite, Inconel N06625 + Graphite.
Standard Features	Triple offset geometry removes all sliding seat friction within 90° rotation to minimize wear torque. Bidirectional bubble-tight zero leakage shutoff across extreme temperature variations. Stellite® Grade 6 hardfacing on integral body seats for high frequency cycling life. Blowout-proof shaft structure with heavy-duty bearing/braided graphite protectors. Cryogenic variants handle down to -254°C; High-temp variants handle up to 815°C with extended bonnets. AWWA C504 compliant double eccentric rubber-lined valves optimized for municipal water works.

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