Established in 1982 and principally serving the oil and gas production industry, WellMark today produces a broad range of liq ... uid and pneumatic controls and valves. Products include: • Hydrostatic Headswitches • Electric and Pneumatic Liquid Level Controls • Safety Relief Valves (ASME Section VIII certified) • Pressure Regulators • Back-pressure Regulators • Chemical Injection Pumps - Pneumatic, Solar-Powered and AC-powered • Browser-based Remote Monitoring & Control of Well Site Assets • Diaphragm-Operated Motor Valves • Throttling & Choke Valves • Mechanical Dump Valves & Controls MIZER® Pilot Valve WellMark continues to lead the way with green alternatives to help producers meet their EPA Natural Gas STAR Program emission-reduction goals. They are the exclusive licensed manufacturer of the MIZER® Pilot Valve, a device which painlessly converts many high-bleed pneumatic controllers to low-bleed. Other environmentally-conscious products include Solar-powered Chemical Injection Pumps and Mechanical Dump Valves and Controls. read more