Keystone Series GR Resilient Seated Butterfly Valves

GENERAL APPLICATION:

Water, air, dry bulk conveying etc. These valves are for any service where a drop-tight shut-off 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 DN 300).

• 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.

• Actuator flange according to ISO 5211.

• 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 (2014/68/EU) Module B + D,

CE Marking.

• Available approvals: NSF/ANSI 61, ACS, KIWA, WRAS, DVGW-G, ABS, CU-TR.

• Sizes DN 20 up to DN 40 might deviate from the above mentioned features.

TECHNICAL DATA

Sizes: DN 20 - 900

Pressure:

16 bar DN 20 - 300

10 bar DN 350 - 900

Reinforced seat:

16 bar DN 350 - 600

End of line:

10 bar DN 20 - 300 6 bar DN 350 - 900

Reinforced seat: 10 bar DN 350 - 600

Vacuum service: 0.4 bar Temperature: -28°C to 160°C

Flange accommodation:

PN 6/10/16

ASME 125/150

JIS 10K

JIS 16K

BS Table E

AS4087 PN 16

AS2129 Table E