TOP-FLO® Series 77 Ball Valves

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Part NumberSize (inches)Clamp SizeABCDISO-5211

Series 77 3-pc ball valves feature a high-quality CF3M investment casting of center body and end caps with 316L ball & stem and are an excellent choice for use in clean steam systems.

Valve end connections are hygienic clamp or extended butt weld type for orbital welding. Standard seals are non-cavity filled modified PTFE (MPTFE) that are FDA conforming and USP Class VI certified. Internal surface finishes available are BPE codes SF1, SF4, and SF5. All stainless valve components are fully traceable with MTR’s for the center body, end caps, ball, and stem. Available in sizes ½” through 4” – all valves feature direct mount ISO5211 mounting pad for easy automation and stem extension installation.


  • Direct Mount, easy to automate
  • Sizes 1/2” to 6″
  • Cavity filled and non-cavity filled
  • ISO 5211 Mounting Pad
  • 800/1000 PSI
  • 316L Body Ball and Stem Full Port
  • Sanitary clamp ends or extended tube OD ends
  • An excellent choice for use in clean steam systems
  • Excellent for Pharmaceutical and food & beverage
  • 100% BPE compliant
  • Full material traceability

Main valve components are made from 316L stainless steel

  • Body and ends are 316L CF3M ASTM A-351 investment cast stainless steel
  • The ball is machined from 316L CF3M ASTMA-351 cast stainless steel
  • The stem is machined from ASTM A-493 316L bar stock
  • Full traceability on all wetted parts (MTR’s)
  • Standard internal polish is 15Ra and is polished to meet BPE specifications of part SF and tables SF-2.2-1, SF 2.2-2, and SF-2.4-1.
  • Standard seats MPTFE (FDA, USP 23 Class VI)
    Stem packing MPTFE
  • Full port to I.D. of tubing for reduced pressured drop
  • Bottom entry 316L pyramidal lives loaded blow out proof high cycle stem adjusts to temperature and pressure fluctuation.
  • Locked stem nut to prevent loosening after continuous valve actuation
  • Dual anti-static devices on the stem (contact between stem and ball, and stem and valve body)
  • ISO 5211 direct mounting pad
  • Direct mount actuation 1/2” to 4”
  • Handle locking device when manually actuated
  • 3-piece body construction for ease of repair
  • Open bolt design to facilitate full external cleanability
  • Ends – Clamp, extended butt weld, or clamp by extended butt-weld.
  • Clamp end requirements per BPE 2012 DT-7-1.
  • Extended butt weld- 316L CF3M ASTM A351 controlled sulfur only per to BPE 2012 part MM section 5.1.1 and DT-3.1, DT-3.2, DT- 4.1, and DT-4.1.1.

Steel & O’Brien offers several different types of switch packages and control monitors for position feedback to PLC.

Optional integrally mounted or externally mounted solenoid valves are also available.

Options include….


  • Mechanical
  • Proximity
  • Namur

Network Type:

  • AS-i
  • DeviceNet
  • Foundation Fieldbus
  • Modbus

Manufactures available but not limited to Westlock, StoneL, Moniteur, Burkert, A-T Controls

Note: Not all platforms are available on all valve types. Consult the factory for availability depending on requirements.

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