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Our People - Experienced Valve Engineers

Onyx Valve Company
835 Industrial Hwy
Cinnaminson, NJ 08077
Ph: 856-829-2888
Fax: 856-829-3080

Our People. Our Strength.

The Onyx Valve Company is only as strong as its people, and our people have the most experience in the industry.  Our people are experienced and helpful and work day in and day out to please our customers and manufacture best flow control products the industry has to offer.  We encourage you to read through our profiles to get to know us.

david gardellin

David Gardellin, P.E., CEO

Co-founder and President of Onyx Valve Company, David is your primary technical resource for the measurement and control of slurries and other hard-to-handle fluids.  He has been involved in valve engineering since starting as Chief Engineer at RKL Controls/Robbins & Myers in 1975.  He holds a BSME from Drexel University and is a registered Professional Engineer in Maryland and New Jersey.  He holds several patents related to pressure measurement and control, and is the author of numerous technical articles including chapters in the ISA Instrument Engineer’s Handbook and the Encyclopedia of Chemical Processing and Design.

Contact David at david@onyxvalve.com

Jim Campbell

Jim Campbell V.P. & National Sales

Co-founder and National Sales manager, Jim is your principle contact for Technical Sales. In the early 70’s he attended Reid Kerr College. He worked for Babcock & Wilcox Engineering in Renfrew, Scotland, the largest steam block boiler manufacturer in the UK supporting the River Clyde shipping industry. In the early 80’s he moved to the US to join RKL Controls as plant supervisor.  After RKL was purchased by Robbins & Myers, he modified the facility to become the North American Distribution Center for progressive cavity pumps.

Contact Jim at jim@onyxvalve.com

Rory Fadden, Sales Administrator

Rory has been with the Onyx Valve Company in sales for over three years where he has enjoyed satisfying the technical aspects of complicated projects. A strong communicator, Rory has established lasting relationships across the world in an ever growing network of industry players. When he’s not selling pinch valves, he can be found reading the news, competing in sports, or playing his guitar.

Contact Rory at rfadden@onyxvalve.com


Chris Reidl, B.S.M.E.T. Drexel University, Sales Engineer

A detail-oriented engineer, Chris invests the time and energy to ensure that your valves and isolator rings are correct in every detail and will perform exactly as you intend for every application.  Chris is the contact for Spanish-speaking inquiries. 

Contact Chris R. at creidl@onyxvalve.com


Chris Schmidbauer, B.S.M.E.T. Drexel University, Draftsman/Designer

He is your first contact for certified drawings, submittals, outline drawings, I&M packages, and any other technical information or schematics related to Onyx Valve products.   Excellent communication skills make him an easy person to contact.

Contact Chris S. at cschmidbauer@onyxvalve.com

Howard Leisner

Howard Leisner, Controller

Howard is your first contact for AP, AR, credit approval, credit card transactions, wire transfers, customs issues, and any other financial assistance you may require.

Howard is also our Traffic Manager and can help coordinate trucking, air freight, import and export concerns.

Contact Howard at hleisner@onyxvalve.com

Tom Smith, Purchasing Agent

Tom is your first contact for the Onyx Purchasing Department and is the principle person responsible for the purchasing of all goods and raw materials.

Contact Tom at tsmith@onyxvalve.com

Mark Massimilla, Designer

Co-founder and Lead Designer, Mark is responsible for product design, research & development and the company’s manufacturing database.  He has been involved in valve design since he started as a Designer at RKL Controls/Robbins & Myers in 1984.

Contact Mark at massimilla@onyxvalve.com

Robert Delfino, Draftsman/Designer

Rob is your first contact for certified pressure sensor drawing submittals and approval drawings.  He is also in charge of processing all pressure sensor orders and the design of all specialty pressure sensor projects.

Contact Rob at rdelfino@onyxvalve.com


Robert Schmied, Machine Shop Foreman

Bob is the machine shop foreman, and one of the founders of the Onyx Valve Company. His responsibilities include supervising the daily operation of the machine shop and final parts inspection. Bob was a machinist and shop foreman at RKL Controls/Robbins & Myers, and has over 30 years experience in the pinch valve industry.

Contact Rob at rschmied@onyxvalve.com