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Keystone Figure 1/2 Butterfly Valves
A heavy duty industrial resilient seated butterfly valve in both wafer and lugged body design for use in shipbuilding, water, HVAC, power, and chemical industry applications.
Keystone Figure 1/2 Butterfly Valves


304 Stainless Steel, 316 Stainless Steel, Aluminum Bronze, Buna-N, Cast Iron, Ductile Iron, Epdm Rubber, Stainless Steel
Operating Temperature
Less Than 120 C
Pressure Class
Process Connection Type
Seat/Seal Type
Shutoff Class
Zero Leakage
Valve Size
10 / DN 250, NPS 12 / DN 300, NPS 14 / DN 350, NPS 16 / DN 400, NPS 18 / DN 450, NPS 2 / DN 50, NPS 20 / DN 500, NPS 2-1/2 / DN 65, NPS 24 / DN 600, NPS 3, NPS 30, NPS 36, NPS 4 / DN 100, NPS 40
Valve Size Standard
Valve Type
Resilient Seated Butterfly Valve


  • Factory testing of every valve at full rating ensures 100% tight shut-off.
  • Actuator flange is standardized for easy operator interchangeability and direct mounting of Keystone range of actuators.
  • Primary seal is formed by preloaded contact between disc and seat. These seals protect valve from fluid contact.
  • Bi-directional stem seal is suitable for pressure and is self- adjusting.
  • The disc hub edge is rounded and polished to provide full concentric seating without seat obstruction to flow, as well as to ensure maximum seat life.
  • Replaceable elastomer seat isolates the shaft and body parts from the stream and also serves as the flange gasket.
  • Moulded-in O-ring provides positive flange sealing and eliminates the need for additional gaskets.
  • Heavy duty top bushing absorbs side thrust and torque loads.
  • Heavy duty one piece shaft design provides high strength and positive disc control.
  • Stainless steel disc screws allow quick and easy disassembly.
  • Disc screw connection is positive shake proof and stronger than shaft.