Keystone Figure 55 Butterfly Valve

Features

• The centric disc offers bidirectional service and allows with its symmetric shape high Kv (Cv) values.
• Dry shaft design.
• The inside body is protected by a bonded rubber liner extending over the flanges.
• Primary stem sealing by preloaded contact between flatted seat surface and rounded polished disc-hub area exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.
• A secondary sealing is provided by the interference fit between shaft and shafthole in seat at all positions.
• Dirtscraper prevents moisture penetrating into the shaft area.
• Bubble-tight shut off at full pressure rating.
• Rounded, polished disc edge provides concentric sealing.
• Actuator flange acc. ISO 5211.
• Double flanged body design per EN 558 series 13 (short), series 14 (long) on request.
• Excellent performance in media with sedimentation and contamination.
• Suitable for severe vacuum applications and up to 16 bar (230 psi) drop tight shut off.