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Jamesbury® EasyFlow JA series concentric disc resilient seated butterfly valves are suitable for a wide range of applications in manual or automated on/off through throttling control services. Although compact and lightweight, the JA series is designed to be rugged, reliable, and to comply with a variety of global industry standards.


  • ISO 5211 mounting pad for direct mounting of handle, gear operator, manual override, or actuator
  • An extremely tight fit square drive between the stem and disc provides accurate and repeatable shut-off and control
  • Bonded seal is the most rugged method of construction available, providing consistent operating torque, maximum cycle life, and higher flow velocities in control. Avoids pinching and tearing that can occur with non-bonded seal designs
  • Bonded seal is easy to remove and replace if maintenance is ever needed
  • Disc is precision machined with a spherical disc edge to provide long cycle life
  • Two-piece stem arrangement for highest Cv and maximum flow
  • Top and bottom stems have anti blow-out protection that also prevents lifting or pushing of the disc during actuator installation or removal
  • Lower stem includes groove for easy servicing
  • The burnished stem is supported by self lubricating polymer bearings to minimize deflection and provide smooth operation and long life
  • Direct actuator mounting capability


  • Water and waste water
  • Sewage treatment
  • Mining and other slurries
  • Fuel oil and gas
  • Cooling or chilled water circuits
  • Desalination
  • HVAC
  • Cement and other fine powders
  • Mild corrosive chemicals and petrochemicals

Additional Info


Nominal diameter:
DN50 – DN600 (NPS 2 – 24)
Pressure rating:
PN10, PN16, Class 150
Flange accommodation:
EN1092 (PN10, PN16)
ASME B16.5 Class 150
JIS 10K,16K
Refer to flange table for availability by size
Face to face dimension:
Per API 609 Table 2 for Category A
BS EN 558 Table 2 Series 20 valves
Vacuum rating:
Up to 20 inch Hg gauge or 26 kPa(a)
100 % tightness at full differential pressure
Standards followed:
ISO 5211, API 598, API 609, ASME B16.5, BS EN 593 IS 13095

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