DeWalt 5140186-73 Check Valve – Genuine OEM Replacement Air Compressor Check Valve

Part Number: 5140186-73
Category: Air Compressor Parts & Accessories → Compressor Pump Parts → Check Valves
Type: DeWalt 5140186-73 Check Valve – Genuine OEM Replacement Air Compressor Check Valve

The DeWalt 5140186-73 Check Valve is a genuine OEM replacement check valve designed for compatible Porter-Cable air compressors. Installed between the compressor pump and air tank, this one-way valve allows compressed air to flow into the tank while preventing it 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 damaged check valves, helping restore proper pressure retention, reliable compressor cycling, and efficient pump performance.

Key Features & Benefits

• Part Number: 5140186-73
• Genuine OEM DeWalt replacement part
• Replacement air compressor check valve
• Allows compressed air to flow into the tank while preventing backflow
• Helps maintain tank pressure after the compressor shuts off
• Supports proper unloader valve operation
• Precision-manufactured OEM component
• Direct-fit OEM replacement
• Manufactured to original equipment specifications

Technical Specifications

Part Number: 5140186-73

Manufacturer: DeWalt

Product Type: Check Valve

OEM Part: Yes

Application: Air Compressor Pump & Tank Assembly

Compatible Applications

The DeWalt 5140186-73 Check Valve fits select:

Porter-Cable

• PXCMF220VW 1.5 HP 150 PSI 20-Gallon Portable Air Compressor (Type 0)
• PXCMF226VW 1.5 HP 155 PSI 26-Gallon Portable Air Compressor (Type 0)

Always verify your compressor model, type number, and original part number before ordering to ensure proper compatibility.

Function of the Check Valve

The DeWalt 5140186-73 Check Valve serves as a one-way valve within the compressor system. It helps to:

• Allow compressed air to enter the air tank
• Prevent air from flowing back into the compressor pump
• Maintain stored tank pressure after shutdown
• Support proper compressor restart
• Improve overall compressor efficiency
• Restore the compressor's original pressure retention performance

Using a genuine OEM replacement check valve helps ensure proper fit, dependable sealing, and long-term compressor reliability.

Common Signs Replacement Is Needed

Replace the check valve if you notice:

• Air leaking from the unloader valve after shutdown
• Compressor struggles to restart under pressure
• Air leaking back toward the pump
• Loss of tank pressure when the compressor is off
• Damaged or corroded valve
• Internal valve sticking or failure

A worn or damaged check valve can reduce compressor efficiency, cause hard starting, and prevent the system from maintaining proper tank pressure.

Installation & Service Notes

Disconnect the compressor from the power source and completely drain all air pressure from the tank before performing any repairs.

Remove the discharge tube and existing 5140186-73 Check Valve according to the manufacturer's service instructions. Inspect the discharge tube, tank port, fittings, and unloader line for wear or damage before installing the replacement valve. Apply an appropriate thread sealant if specified by the manufacturer, tighten the valve securely, reconnect all tubing, and verify that the compressor builds pressure properly without leaks before returning it to service.

Important: Always verify your compressor model, type number, and original part number before ordering. Use genuine OEM DeWalt replacement components to ensure proper sealing, reliable pressure retention, and long-term air compressor performance.

Maintenance Recommendations

• Drain moisture from the air tank regularly.
• Inspect fittings and discharge tubing for air leaks.
• Check the check valve whenever servicing the compressor pump.
• Replace damaged fittings or seals promptly.
• Keep the compressor operating within its rated duty cycle.
• Use genuine OEM replacement parts to maintain factory pressure retention, reliable compressor cycling, and long-term air compressor reliability.