About

About Primary Flow Signal, Inc. Primary Flow Signal, Inc. (PFS) is a leading U.S.-based manufacturer specializing in engineered flow measurement solutions for critical process and utility applications. With decades of innovation and expertise, PFS designs and produces high-performance primary flow elements including Venturi tubes, flow nozzles, orifice plates, wedge meters, and proprietary conditioning devices. Headquartered in Cranston, Rhode Island, PFS serves a broad range of industries such as power generation, oil & gas, water/wastewater, chemical processing, and HVAC. Backed by experienced engineering and customer support teams, PFS partners closely with clients to optimize flow measurement solutions that improve process control, efficiency, and accountability. With a strong focus on quality, innovation, and customer satisfaction, Primary Flow Signal continues to be a trusted partner for accurate, durable, and cost-effective flow measurement across the globe. PFS is the world's largest Venturi Meter manufacturer.