Keystone Series 60 heavy duty resilient seated butterfly valves feature a cartridge seat design and are available in a range of body, disc and seat materials to suit a variety of applications.
Suitable for high pressure and full vacuum service due to the use of a cartridge seat design.
Triple function cartridge seat isolates the body and stem from the media, provides positive drop-tight shut-off of line media at full rated pressure and provides a flange seal, eliminating the need for flange gaskets.
Full rated unidirectional dead-end service is achieved by utilizing a unique patented lip in the lug body.(2"-24" only)
Strong disc-to-stem connection and elimination of exposed pins or bolts is achieved through a rectangular drive.
Ability to install the valve with the disc in the closed position eliminates the risk of damage to the valve during installation.
Maximum flow and rangeabililty is achieved with the use of a streamlined disc.
Blowout-proof stems as a standard.
Longer seat life with low operating torques is ensured by utilizing upper and lower stem bearings.
Need for costly brackets is eliminated due to the ability to direct mount actuation onto the valve top-plate.
Designed to comply with MSS-SP-67 and API 609 (may be shell tested to spec request)