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Valves & Actuation

Plastic Manual Ball Valves

Type-21a SST Flow Control True Union Ball Valve (1/2" – 2")

SST Logo Nov 14 2019

Position Indication from Closed to Open

Type 21 SST top view closed Type 21 SST half open Type 21 SST top view open


0% Open


50% Open


100% Open


Data Sheets

Asahi Minute Video


Ideal Applications Include:

Isolation valves, water treatment, water features, fountains, aquariums, landfills, swimming pools, power plants, mining, transportation, chemical processing


1/2" – 2"

Bodies Materials:


Seals Materials:


Body Type:

True Union


  • PVC body
  • EPDM or FKM seals
  • True union design
  • Equal percentage flow characteristics
  • Precision machined flow control ball and seat design
  • SST - Seat Support Technology
  • Degreed indicator plate (manual type)
  • Indicator line on handle (manual type)
  • Flow direction arrow label
  • Handle doubles as carrier adjustment tool
  • ISO 5211 top flange bolt pattern
  • Integrally molded base pad for panel mounting
  • Dual stem O-rings


  • Electric
  • Pneumatic


  • Electric actuation with 4-20mA control
  • Pneumatic actuation with 4-20mA control
  • Stem extension
  • 2” square operating nut