Asahi/America
A new ball valve for precision flow control
The Type-21a Seat Support Technology (SST) flow-control ball valve (photo) offers all of the robust elements of the Type-21 and the ability to precisely control flow. Available in½- to 2-in. sizes, the SST ball valve features a precision-machined polyvinylchloride (PVC) ball with center provisions to support PTFE seats from 0 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 0-to-100 deg indicator plate and an indicator line on the handle, which doubles as a carrier adjustment tool. The valve body is PVC with either EPDM (ethylene propylene diene monomer) or FKM (fluoroelastomer) O-rings. — Asahi/America, Lawrence, Mass.