Top Line Process Equipment Company is a leading supplier of quality hygienic stainless steel process equipment, including stainless steel tubing, hygienic valves and biotech valves. For 4 decades, our hygienic diaphragm valves such as our Bio-Flo® II, Bio-Pro® Cast, Bio-Pro® Forged, to name a few, have serviced the dairy farm, biotechnology and pharmaceutical industries.