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Brass vacuum relief valve with 1-1/4 inch NPT male inlet

Control Devices

Control Devices VRG125-001 Vacuum Relief Valve 1-1/4" NPT

SKU CH-HPJJ-PANAE

Brass vacuum relief valve for low-pressure tanks and steam vessels, 1-1/4" NPT male inlet, 100 cfm max flow, proportional relief up to 13.3 psi, rated -20 °F to 400 °F

  • Protects low-pressure tanks with proportional relief up to 13.3 psi
  • Brass body handles steam vessels and vacuum equipment up to 400 Degrees F
  • Male 1-1/4" NPT inlet fits standard piping without adapters
  • Delivers up to 100 cfm flow for reliable vacuum system operation
  • Operates from -20 Degrees F minimum temperature for cold environments

VRG125-001 vacuum relief valve for low-pressure

The Control Devices VRG125-001 is a proportional vacuum relief valve built for low-pressure tanks, steam vessels and vacuum equipment. Its brass body handles operating pressures up to 13.3 psi and temperatures from -20 to 400 degrees F. A 1-1/4 inch male NPT inlet provides a direct connection for industrial piping.

Replaces fixed or undersized relief valves

Upgrade when an existing valve cannot deliver proportional relief or when flow capacity falls below the 100 cfm maximum this model provides. The jump is worth it if the system operates near the 13.3 psi cracking-pressure ceiling and needs a brass body rated for the full -20 to 400 degree F range.

Brass NPT valve limited to 13.3 psi and 100 cfm

The proportional relief design opens gradually with vacuum increase, but it cannot protect vessels that exceed the 13.3 psi maximum operating pressure. Flow tops out at 100 cfm, so larger vacuum pumps or rapid evacuation events may overwhelm the valve. The 1-1/4 inch NPT thread also restricts use to matching pipe sizes.

Highlights

  • Protects low-pressure tanks with proportional relief up to 13.3 psi
  • Brass body handles steam vessels and vacuum equipment up to 400 Degrees F
  • Male 1-1/4" NPT inlet fits standard piping without adapters
  • Delivers up to 100 cfm flow for reliable vacuum system operation
  • Operates from -20 Degrees F minimum temperature for cold environments

Specifications

BrandCONTROL DEVICES

Questions about this item

What size and type of thread does the 1-1/4" NPT inlet port require for mounting?

The valve has a male 1-1/4 inch NPT inlet port, so it threads directly into a matching female NPT fitting on your tank or vessel.

How do I install this brass vacuum relief valve, and what common mistake should I avoid?

Apply thread sealant to the male NPT threads and tighten into the female port; the common error is over-tightening, which can crack the brass body or strip the threads.

When should I plan to inspect or replace the valve given its proportional relief design and 13.3 psi maximum cracking pressure?

Inspect annually for corrosion or seat wear, especially after exposure to temperatures near the 400 °F maximum, and replace if the valve no longer reseats cleanly at the set vacuum level.

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