- Keystone Series GR general purpose resilient seated butterfly valves are available in flanged, lugged or wafer body style for any service where drop-tight shut-off and maximum flow area is required.
FEATURES
SPECIFICATIONS
DRAWINGS & DOCUMENTS
- Double flanged body design with face-to-face dimensions, according to EN 558 Series 20, API 609 and AWWA C504 short.
- Designed according to EN 593 and API 609.
- The seat is field replaceable and fully isolates the body and shaft from the flow.
- Primary shaft sealing exceeds the pressure rating of the valve and prevents leakage through the shaft area to the atmosphere.
- A secondary shaft sealing provides back-up safety.
- A molded-in O-ring in the seat for flange sealing eliminates the need for gaskets.
- Shaft seals prevent moisture penetrating into the shaft area.
- Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life, and drop-tight shut-off.
| Sizes: | DN 50 – 900 (NPS 2 – 36) |
| Pressure: | 16 bar DN 50 – 300 (230 psi NPS 2 – 12) 10 bar DN 350 – 900 (150 psi NPS 14 – 36) |
| Reinforced seat: | 16 bar DN 350 – 600 (230 psi NPS 14 – 24) |
| End of line: | 10 bar DN 50 – 300 (150 psi NPS 2 – 12) 6 bar DN 350 – 900 (90 psi NPS 14 – 36) |
| Reinforced seat: | 10 bar DN 350 – 600 (150 psi NPS 14 – 24) |
| Vacuum service: | 0.4 bar (5.8 psia) |
| Temperature: | `-40°C to +160°C (-40 °F to +320°F) |
| Flange accommodation: | PN 6/10/16, 125/150, JIS 10K, BS Table E, AS4087 PN 16, AS2129 Table E |