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Brass compressor unloader valve with threaded ports and pressure adjustment knob

Industrial Air

Industrial Air Compressor Unloader Valve 125-155 psi

SKU CH-ESN1-N6BNH

Releases pressure between 125 and 155 psi and fits Dewalt, Industrial Air Contractor and Powermate compressors

  • Automatically releases pressure at 125-155 psi for safe compressor cycling
  • Fits Industrial Air, DeWalt and Powermate models with listed part numbers
  • Replaces Grainger references 41RC98 and 43AG29 for quick identification
  • New Powermate component manufactured to original equipment specifications
  • California Proposition 65 warning applies for chemical exposure awareness

What this valve does

The Powermate 070-0061RP is a compressor unloader valve preset to open between 125 and 155 psi. It releases head pressure when the motor stops so the compressor can restart without loading the pump. The part fits Industrial Air Contractor, Dewalt and Powermate units that use the CTA5090412 or DXCMTA5090412 reference. Buyers replacing a failed factory valve on those brands will find a direct match.

Pressure range and compatibility limits

The valve operates only within the 125 to 155 psi band; systems running outside that window will not unload correctly. Compatibility is limited to the manufacturer part numbers listed in the data — CTA5090412 and DXCMTA5090412 — and the associated Grainger references 41RC98 and 43AG29. Compressors from other brands or series not referenced here are not supported by this component.

Check your compressor before ordering

Verify the existing unloader valve carries the Powermate 070-0061RP marking or matches the CTA5090412 and DXCMTA5090412 part numbers. Confirm the compressor nameplate shows Industrial Air Contractor, Dewalt or Powermate and that the cut-out pressure falls between 125 and 155 psi. The product carries a California Proposition 65 warning for chemicals known to cause cancer and reproductive harm.

How it compares

Measured against everything we stock in Plumbing Valves & Valve Assemblies, at today’s prices. Recalculated every night.

Price $44.99
Typical for this category: the median of 720 items is $47.49.

Specifications

Product
Brand namePOWERMATE

Questions about this item

What pressure range does the 125-155 psi unloader valve cover?

This valve opens between 125 and 155 psi, venting the compressor head when the tank reaches that pressure band.

What happens when the valve reaches 155 psi in a running compressor?

At the upper end of its range the valve releases head pressure so the motor restarts against minimal load, reducing starter current.

Which thread standard does the Powermate 070-0061RP valve use?

The valve fits the standard NPT port used on Dewalt, Industrial Air Contractor and Powermate compressors listed in the compatibility data.

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