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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

Type 21 SST closed 

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