NW NORRISEAL WELLMARK

Externally-mounted chambers and domes for use with liquid level switches or liquid level controllers, namely, metal storage tanks for oil and gas

Pressure regulators being parts of machines; check valves as parts of machines; butterfly valves being parts of machines; pneumatic and hydraulic valve actuators

Safety valves being pressure relief valves for oil and gas facilities; automatic control valves; automatic liquid level control machines; liquid level switches for monitoring and controlling liquids in tanks and vessels; pressure controllers for controlling the pressure of liquid, semi-liquid, and gaseous substances in industrial processes; liquid level gauges; electric valve actuator

Pressure regulators for gas pipes and lines