The Keystone Series GR is a heavy duty industrial Butterfly Valve. The Keystone GR is resilient seated, and is used where a drop-tight shut-off valve with maximum flow area is required.
Features
Wafer and lugged body design with face-to-face dimension, according to EN 558 Series 20 and API 609
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 shaft area to 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
The two piece shaft allows for a thin disc and provides minimal obstruction to flow (up to NPS 12)
Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and drop-tight shut-off
Body locating holes allow ease of installation and centering between the flanges.
Extended body neck allows for pipe insulation
Top and bottom shaft bearings for optimized support and minimum friction and decreased torque
Top bushing absorbs actuator side thrust loads
All Valves comply to Pressure Equipment Directive (97/23/EU) Module B1 + D, CE Marking
Available approvals: KIWA, ABS, WRAS, ACS, NSF/ANSI STD 61.
