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Category: Material
Volume: 41
Issue: 2
Article No.: 5795

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Type-21a SST Ball Valve
Asahi/America, Inc., a leader in thermoplastic fluid flow technologies, introduced the Type-21a Seat Support Technology (SST) flow control ball valve. This true union ball valve offers all of the robust elements of the Type-21 and the ability to precisely control flow.

Available in 1/2” through 2”, the SST ball valve features a precision-machined PVC ball with center provisions to support PTFE seats from zero to 100% of capable flow. The Type-21a SST ball valve produces equal percentage flow characteristics for fine throttling. The valve requires directional installation and comes equipped with a flow direction label.

Manually operated SST ball valves include a zero-to- 100° indicator plate and an indicator line on the handle, which doubles as a carrier adjustment tool. An ISO 5211 top flange bolt pattern and integrally molded base pad for panel mounting are standard on all Type-21a SST ball valves, and the valve body is PVC with either EPDM or FKM O-rings.

Socket, threaded and flanged end connections are all offered for the SST ball valve, and additional options include electric or pneumatic actuation with 4-20mA control, stem extension, and 2” square operating nut.

For more information, contact Lynsey Hurley, Asahi/America, 655 Andover Street, Lawrence, MA 01843, 800-343-3618/781-388-4530, E-mail:, Web:

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