Quadco, Inc. was established in 1966 and is recognized as a leader in sales, testing and repair of Pressure Relief Valves, Pi ... peline and Plant Valves, Drilling Equipment, Instrumentation, and Calibration Services. Quadco, Inc. has sales and service centers located in FARMINGTON, NM; BRIGHTON, CO; CASPER, WY; ANCHORAGE, AK; and PRUDHOE BAY, AK. read more