' The main purpose of a check valve is to prevent backflow in the system. Figure 1 shows an example of a check valve. A check valve relies on a pressure differential to work. They require a higher pressure on the input side of the valve than the output side to open the valve.
Where are DSI valves manufactured?
Manufactured in Houston, TX, DSI carbon and stainless steel valves can be found in over 28 different countries, made with strict conformance to ANSI, ASME, API and ASTM standards, and are used in many different applications within the oil and gas industry.