Porter-Cable A19712 1/2" NPT Check Valve – Genuine OEM Replacement Air Compressor Check Valve

Part Number: A19712
Category: Air Compressor Parts → Air System Components → Check Valves
Type: Porter-Cable A19712 1/2" NPT Check Valve – Genuine OEM Replacement Air Compressor Check Valve

The Porter-Cable A19712 1/2" NPT Check Valve is a genuine OEM replacement air compressor check valve designed for compatible Porter-Cable, DeWalt, Craftsman, DeVilbiss, Black & Decker, and Delta air compressors. This brass check valve directs compressed air from the pump into the air tank while preventing stored air from flowing back into the pump after the compressor shuts off. Manufactured to original equipment specifications, it provides a direct-fit replacement for worn, leaking, or malfunctioning check valves, helping restore proper compressor performance and reliable restarting. It also replaces obsolete part number AC-0631.

Key Features & Benefits

• Part Number: A19712
• Genuine OEM Porter-Cable replacement part
• 1/2" NPT air compressor check valve
• Prevents compressed air from flowing back into the pump
• Directs air from the compressor pump into the storage tank
• Durable brass construction for corrosion resistance
• Direct-fit OEM replacement
• Replaces obsolete part number AC-0631

Technical Specifications

Part Number: A19712

Manufacturer: Porter-Cable / Stanley Black & Decker

Product Type: Air Compressor Check Valve

Tank Connection: 1/2 in. NPT

Construction: Brass

Application: Air Compressor Tank Check Valve

OEM Part: Yes

Quantity: Sold Individually

Compatible Applications

The Porter-Cable A19712 Check Valve fits numerous compatible air compressors from the following brands:

Compatible Brands

• Porter-Cable
• DeWalt
• Craftsman
• DeVilbiss
• Black & Decker
• Delta

Common compatible models include:

• Porter-Cable CPF6020
• Porter-Cable CPF6025VP
• Porter-Cable CFFC350A
• Porter-Cable C5100
• DeWalt D55171
• Makita MAC2200

This OEM valve is used across hundreds of compressor models. Always verify your compressor model, type number, original part number, and fitting configuration before ordering to ensure proper compatibility.

Function of the Check Valve

The A19712 Check Valve is designed to:

• Direct compressed air from the pump into the air tank
• Prevent stored air from flowing back into the pump
• Allow the unloader valve to relieve pump head pressure after shutdown
• Improve compressor restarting performance
• Protect internal pump components
• Restore the factory air delivery system

Using a genuine OEM replacement check valve helps maintain proper pressure retention and reliable compressor operation.

Common Signs Replacement Is Needed

Replace the check valve if you notice:

• Air leaking from the unloader valve after shutdown
• Compressor struggles or fails to restart
• Air flowing backward toward the pump
• Constant pressure loss from the tank
• Damaged or corroded valve body
• Compressor motor overloads during startup

A faulty check valve can allow tank pressure to push back against the compressor pump, making restarts difficult and potentially overloading the motor.

Installation & Service Notes

Disconnect electrical power, shut off the compressor, and completely drain all air from the tank before servicing.

Remove the discharge tube and pressure switch unloader line from the existing A19712 Check Valve, then unscrew the valve from the air tank using the appropriate wrench. Apply an approved thread sealant or PTFE thread tape to the replacement valve threads if specified by the manufacturer, then install and tighten the new valve securely without overtightening. Reconnect the discharge tube and unloader line, restore power, and run the compressor to verify proper pressure buildup and confirm there are no air leaks.

Important: Always verify your compressor model, thread size, and original part number before ordering. Inspect the discharge tube, compression fittings, and unloader line during replacement and replace any worn or damaged components as necessary.

Maintenance Recommendations

• Drain the air tank regularly to reduce internal moisture and corrosion.
• Inspect the check valve periodically for leaks or pressure loss.
• Keep discharge tube fittings tight and free of debris.
• Replace leaking check valves promptly to prevent hard starting.
• Use clean, dry compressed air whenever possible.
• Use genuine OEM replacement parts to maintain factory fit, reliable pressure retention, and long-term air compressor performance.