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Small brass G 1/4 pressure check valve 16.53mm diameter

PrimoChill

PrimoChill SX Pressure Check Valve G 1/4 16.53mm

SKU CH-KP69-WH0A7

A G 1/4 stop fitting that vents trapped air and eases loop priming, with a 16.53 mm diameter

  • TypeCPU Block

Option Dark Nickel

Show 10 more configurations

Struck-through versions exist but are not stocked here.

  • Releases trapped air to prevent pressure build-up
  • G 1/4 thread fits standard water-cooling fittings
  • 53 mm overall diameter for compact installations
  • Installs in seconds without specialised tools
  • Helps eliminate air locks and simplifies loop priming

PrimoChill SX Pressure Check Valve

The PrimoChill SX Pressure Check Valve is a G 1/4 threaded stop fitting designed for custom water-cooling loops. It targets builders who need a reliable way to vent trapped air from the highest point of a reservoir or radiator. The valve activates automatically when internal pressure accumulates, releasing air to prevent air locks. This component suits enthusiasts assembling or maintaining open-loop liquid cooling systems.

Function and Installation Impact

The valve eliminates the need for manual bleeding cycles by venting air whenever pressure rises, which simplifies the initial priming process. Installation requires only seconds thanks to the industry-standard G 1/4 threads and 16.53mm overall diameter. A pre-set mechanism means no user adjustment is necessary before fitting it into the loop. The package includes a single valve ready for immediate integration.

Operational Limits and Precautions

Fluid can escape alongside air if no air pocket exists beneath the valve when pressure builds, so sensitive components must not sit directly below the installation point. Over-tightening the G 1/4 threads risks stripping them and compromising the seal. The manufacturer accepts no liability for hardware damage resulting from use, placing responsibility on the installer to position and torque the fitting correctly.

Highlights

  • Releases trapped air to prevent pressure build-up
  • G 1/4 thread fits standard water-cooling fittings
  • 53 mm overall diameter for compact installations
  • Installs in seconds without specialised tools
  • Helps eliminate air locks and simplifies loop priming

Specifications

TypeCPU Block

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Questions about this item

Does the G 1/4 thread on this valve need any sealant or scheduled replacement?

The valve uses a standard G 1/4 thread that seals with the included O-ring; no extra sealant is required and the fitting itself has no service interval.

What pressure level makes the valve open and vent fluid instead of just air?

The valve is pre-set to open when loop pressure exceeds its internal spring rating, releasing either air or coolant if no air pocket remains below the fitting.

Will the brass body add noticeable heat to the loop during continuous operation?

The fitting is a passive brass component with 16.53 mm diameter; it adds no active heat and its thermal mass is negligible in a running loop.

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