• Design features easy removal and reassembly of internal components
• Forged brass body exceeds the most stringent quality standards in the industry
• Horizontal or vertical installation not to be installed with bonnet facing down
• Y type design provides minimal pressure drop and increased flow capacity
• 4-bolt flange allows easy disassembly and assembly for brazing or internal component changes
• Non-asbestos gasket material and O-ring seal ensures seal integrity and is compatible with new refrigerants and oil
• Heat-stabilized PFTE seat provides positive seal across wide temperature ranges
• Back-pressure shut-off at low pressure differentials
• All valves 100% tested and compatible with all fluorinated refrigerant
• 700 lbf/sq-in maximum abnormal pressure (MAP)
• Less than 1 lb/sq-in pressure to open
• 8-15 ft-lb recommended bolt torque

Mueller's 4-bolt check valves feature forged brass bodies that exceed the most stringent quality standards in the industry. The 4-bolt flanges allow easy removal and reassembly of internal components. Suitable for either horizontal or vertical installation, the Y type design provides increased flow capacity and minimal pressure drop. The non-asbestos gasket material and O-ring seal ensure absolute seal integrity while heat-stabilized PTFE seats provide a positive seal across wide temperature ranges. Our 4-bolt check valves also feature backpressure shutoff at low pressure differentials and special springs for various differential applications.