Welcome to Sigmamotor Inc.

Precision CNC machined products include back pressure valves, pressure relief valves and calibration products for water disinfection and chemical dosing.

Since 1951 Sigmamotor Inc. has been an innovator and industry leader in pumping technologies.

We developed the first peristaltic blood pump for open heart surgery, the first infusion pump, the first blood pump used in kidney dialysis and the first of the tumor perfusion units.


Sigmamotor back pressure valves, pressure relief valves and calibration cylinders are widely used as vital components in chemical feed systems for treatment and disinfection of drinking water as well as a myriad of other industrial, pharmaceutical, food & beverage and medical applications.


Sigmamotor Inc. is well equipped with CNC lathes and mills along with conventional tools. We do prototype work as well as mechanical assembly.

We have a thorough, ISO9000 documented inspection department where parts are inspected by process before they are shipped.


The Sigmamotor T Series Pumps have a long history dating back to use in artificial heart pump development in the 1950’s. The unique design of the T-8 pump uses metal ‘fingers’ that are activated by a cam to progressively squeeze the tubing, gently pushing the liquid through the pump head.

Please visit us at the following trade shows:

AWWA ACE24 Annual Conference & Expo | Anaheim, CA | June 10-13 | Booth 3232
Arizona Water | April 23-25 | Phoenix AZ
NC Rural Water | May 13-17 | Winston Salem
Texas Water 2024 | Fort Worth TX Convention Center | April 9-12, 2024 
KY/TN WPC24 | Sept 8-10 | Louisville KY
VA WATERJAM | 2024 Sept 9-12 | Virginia Beach
WEFTEC Annual Technical Exhibition & Conference – Ernest N. Morial Conv. Center, New Orleans | October 7 – 9, 2024


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SigmaMotor Inc.

PO Box 298
3 North Main Street
Middleport, NY 14105
Tel: 716.735.3115
Fax: 716.735.3425