Development of Dynaflow ball valves grew out of the need for higher reliability zero-leak applications following the Thresher submarine loss in the early 1960s. Fluid Dynamics developed this valve family and qualified it for use on U.S. Navy ships, submarines and other submersibles. The line was later sold to Brunswick Wintec and finally, to Specialty & Ball Valve Engineering, Inc. As a convenience to the many long-standing Dynaflow customers, the original part numbering system used by Fluid Dynamics has been maintained.

Features of the Dynaflow ball valve include:

• bubble tight from zero to 6000 psi for critical applications
• zero leakage across the seat or out the stem
• bidirectional flow operation
• top loaded to cut maintenance costs and down-time
• fugitive emissions safe stem seal, also bubble tight to preclude emissions to outside environment