Profile: Jonloo Machine Manufacturing Co., Ltd. is a manufacturer of industrial steel valves. The valves are grouped into broad categories: gate, globe, check, ball, butterfly, and safety valves in sizes varying from ½" to 80", with pressure ratings from 150LB to 2500LB. Our air compressors include single screw air compressors, piston air compressors, portable air compressors, high/ medium pressure air compressors, and oil-free air compressors. Double flanged swing check valve is installed on the pipeline to prevent the medium flowing back and efficiently restrain water hammer; so it has the function of protecting the pipeline system.