Plattco Corporation is an employee-owned manufacturer operating from its founding Plattsburgh campus, where the company began as a gray iron foundry in 1897. It invented the Double Flap Airlock Valve in the 1960s and has since built its reputation on solving difficult dry-material handling problems for industrial customers around the world. Its in-house engineering, foundry, and machining teams support customized equipment and long-term service from one U.S. location.
ISO 9001:2015-based Quality Management System
Compliance program
OSHA Safety Standards Compliance
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MSHA Safety Standards Compliance
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Valk Manufacturing CompanyPrivately owned since Paul Valk founded it in 1952, Valk Manufacturing remains a four-generation family company in New Kingstown, Pennsylvania. Its 100,000-plus-square-foot plant serves transportation departments, municipalities, and heavy industry with American-made equipment built in-house from North American steel.333120NEW KINGSTOWN, PA
Kerotest Manufacturing CorpKerotest Manufacturing Corp. makes valves and related equipment, a business it traces to its 1909 founding in Pittsburgh. The employee-owned company retains its headquarters, product development, engineering, manufacturing, and customer service operations in Pittsburgh, with a second manufacturing facility in Mansura, Louisiana. Its longstanding work serves energy markets as well as municipal water customers.PITTSBURGH, PA
Webb-Stiles CompanySince Joe Webb and Don Stiles formed their Ohio partnership in 1956, Webb-Stiles Company has grown into a U.S. manufacturer known for solving difficult material-handling problems with custom-built equipment. Based in Valley City with a second manufacturing division in Alabama, the company serves industrial operations nationwide and keeps each project under its own roof from engineering through field installation.VALLEY CITY, OH
R.P. AdamsFounded in 1937 by inventor Renard P. Adams, R.P. Adams has built its identity around solving industrial equipment problems from its Tonawanda, New York plant. The company employs more than 50 people in a 60,000-square-foot facility where design and manufacturing are handled in-house, a setup that supports custom engineering and unusually long-lived equipment. Its history includes developing the first multi-element automatic backwash strainer patented in the United States, and some of its products remain in service for 50 years or more.TONAWANDA, NY