APS PartsSKU: PL-1/2-THERMO

PL-1/2-THERMO 1/2" THERMAL RELIEF VALVE

Name: PL-1/2-THERMO 1/2" THERMAL RELIEF VALVE
Brand: American Pressure Systems
SKU: PL-1/2-THERMO
Price: 14.99 USD
Availability: InStock

$1499

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Overview

The PL-1/2-THERMO is a 1/2" thermal relief valve that protects your pressure washer pump from overheating. It threads into a 1/2" male NPT port and opens to dump hot water once the water trapped inside the pump reaches 140°F — which happens when the machine sits in bypass and recirculates. Venting that hot water pulls in cool inlet water, keeping the pump below the temperature that cooks seals and packing. It's for anyone running a pressure washer that idles in bypass. A leaking valve means it's worn out or has already seen water hot enough to damage the pump, so replace it promptly to protect pump and unloader life.

What's included

Opens at 140°F to vent hot water and cool the pump
1/2" male NPT inlet fitting
Brass body and seal for durability
Stainless steel spring resists corrosion
Protects pump seals, packing, and unloader from heat damage
Guards the pump when the machine idles in bypass

Specifications

Function: Temperature relief for pressure washer pump
Activation Temperature: 140°F
Inlet: 1/2" male NPT
Body Material: Brass
Spring Material: Stainless steel
Seal Material: Brass

Frequently asked questions

It protects your pump from overheating by dumping hot water once the water inside reaches 140°F. When a pressure washer sits in bypass, it recirculates the same water and heats it up; the valve opens to release that hot water and draw in cool inlet water, keeping the pump below the temperature that damages seals and packing.

It threads into any port sized for a 1/2" male NPT fitting. Check that your pump or plumbing has a matching 1/2" NPT female port before ordering.

A leaking valve is either worn out or has already been exposed to water hot enough to damage it. Replace it promptly, since a failed valve leaves your pump and unloader unprotected from heat.

Replace it as soon as it starts leaking or fails to open, since a working valve is critical to pump and unloader life. It's a wear item that protects far more expensive components, so don't run the machine without a functioning one.

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