5. ROSS VALVE CONE VALVE - Ross Valve Mfg. Co., Inc.
Link: http://www.rossvalve.us/cone-valves.html
Description: WEBRoss Valve Mfg. Co., inc. - Flow Control Valve, Cone Valve, Hydraulic Control Valve. Applying Today’s Engineering Technology to a 90 Year Old Design. Utilizing Finite …