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Flow rates depend upon volume displacement by the piston during each stroke, as well as the number of strokes per unit time. The units come in allstainless steel and diaphragm-isolated configurations. Seal materials include Viton, EPDM, and Teflon.
Valcor Scientific, div. of Valcor Engineering Corp., 95 Mt. Bethel Rd., Warren, NJ 07059, (908) 668-1106, valcor.com