Gast AF545 Outlet Valve 56 Frame Piston Pump

Product Description

The GAST AF545 is a replacement outlet valve designed for use with GAST 56 Frame piston-style air compressor pumps. The outlet valve controls one-way airflow out of the compression chamber, opening under pressure during the compression stroke and seating closed on the return stroke. This prevents backflow and maintains consistent output pressure. Licensed HVAC technicians, industrial maintenance technicians, and equipment service professionals install this valve as part of routine pump maintenance or following valve failure. At approximately 1 pound, the AF545 is a compact, drop-in replacement that restores correct pump operation without requiring full pump replacement.

The AF545 is suited for service applications where a GAST 56 Frame piston pump is used in air compressor duty. These pumps appear in a range of professional and light-industrial settings including medical air, vacuum, and pressure systems, HVAC controls, and general instrumentation applications. The outlet valve is a wear component that is periodically replaced during preventive maintenance intervals or when pump output pressure drops, the unit runs continuously without building pressure, or audible valve failure symptoms are present.

Key Features

• Direct OEM-style replacement outlet valve for GAST 56 Frame piston pumps
• Controls one-way discharge airflow to maintain output pressure integrity
• Compact form factor at 3.31 inches length and 3.31 inches height
• Lightweight at 1 pound for easy single-technician handling
• Sold individually, one valve per package

Compatibility

Designed for use with GAST 56 Frame piston pumps. Verify the frame designation on your existing pump before ordering to confirm fitment.

Installation Notes

Outlet valve replacement on a piston air compressor pump should be performed by a qualified technician familiar with compressed-air equipment. Disconnect and lock out electrical power and bleed all system pressure before disassembling the pump head. Inspect the valve seat and surrounding surfaces for wear or debris before installing the replacement valve. Refer to the GAST service manual for the specific pump model to confirm correct valve orientation and reassembly sequence.