THOMAS AIR-PAC 638263 SUPER CHECK IN-TANK CHECK VALVE 1/2 COMP X 1/2 MPT

Description:

The Thomas Air-Pac 638263 Super Check In-Tank Check Valve is designed to prevent compressed air from flowing back into the compressor pump while allowing unrestricted airflow into the air receiver tank. Commonly installed on reciprocating air compressors in industrial workshops, manufacturing facilities, automotive service centers, and OEM compressed air systems. Maintenance technicians, compressor service professionals, and system integrators use this check valve for routine maintenance, compressor repairs, retrofits, and replacement of worn or leaking in-tank check valves.

Applications:

The Thomas Air-Pac 638263 is a heavy-duty Super Check in-tank check valve featuring a 1/2-inch compression inlet and a 1/2-inch male NPT outlet. Constructed with a one-piece brass body, stainless steel spring, and glass-filled PTFE poppet, it delivers dependable sealing performance while preventing tank pressure from returning to the compressor head. The valve includes a standard 1/8-inch unloader port, making it ideal for Thomas Air-Pac and other reciprocating air compressors requiring a high-flow, serviceable check valve.

Technical Specifications:

• Brand: Thomas Air-Pac
• Part Number: 638263
• Product Type: Super Check In-Tank Check Valve
• Inlet Connection: 1/2 in. Compression
• Outlet Connection: 1/2 in. Male NPT
• Unloader Port: 1/8 in. NPT
• Body Material: Brass
• Spring Material: Stainless Steel
• Poppet Material: Glass-Filled PTFE (Fluoropolymer)
• Design: One-Piece Serviceable Check Valve
• Maximum Working Pressure: 450 PSI
• Maximum Operating Temperature: 400°F (204°C)
• Maximum Recommended Flow: 20 SCFM
• Hex Size: 7/8 in.
• Function: Prevents reverse airflow from the air tank while allowing compressor discharge into the receiver tank
• Features: Eight discharge holes for quieter operation, serviceable design for cleaning and repair, factory-tested for backflow leakage performance, corrosion-resistant construction.

Common Replacements:

• Campbell Hausfeld CV223300AV
• Campbell Hausfeld VH611201AJ
• Speedaire 6X213