Profile: Helmco Mfg., Inc. is engaged in the production of excess flow check valves for liquids, gas or vapor flow lines in refineries, chemical plants and local gas company. Our product line includes back pressure check valves, needle valves, ball check valves, plug valves, sampling hose assemblies, laboratory apparatus, reid vapor pressure bombs, adapters and thermometer well fittings. Our excess flow check valves are used in piping systems to limit flows to a predetermined maximum flow. Our sampling hose is supplied with the combination of both handwheel nuts and hexagon nuts.