Pressure regulators are available in two types: relieving and non-relieving. Both can give the maximum volume of flow needed while keeping outlet pressure constant. The difference between relieving and non-relieving regulators depends on whether they self-release or trap excess pressure. At Air Logic, we offer both relieving and non-relieving pressure regulators that can be either preset or adjustable.

Here we explain the features and common applications for relieving and non-relieving regulators to help you choose the right one for your project.

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Relieving vs Non-Relieving Regulators

Relieving Regulator

A relieving regulator releases excess pressure through a relief valve, a hole in the middle of the diaphragm. When air pressure exceeds the acceptable limit of a system, the relieving regulator opens a vent to allow the air to escape. A hissing sound usually indicates the release of air. There is no need to add an extra relief valve to the flow system since the relieving regulator performs this function on its own.

Non-Relieving Regulator

A non-relieving regulator restricts airflow once it exceeds the setpoint. There’s no vent path in a non-relieving regulator so the gas stays in the system. These regulators require extra care because they can become dangerous if excess pressure builds up without being released. In a closed system, it is important to have a relief valve downstream. Alternatively, an open system design should be implemented downstream of the regulator to prevent the build-up of excessive pressure.

Non-relieving regulators are most beneficial when dealing with hazardous or expensive gases. By trapping these gases for safe or controlled release, operators ensure the safety and efficiency of the entire facility.

Applications for Relieving & Non-Relieving Regulators

It’s important to choose the best type of regulator for your application. Here are a few recommendations for each regulator’s best use cases.

Relieving Regulator

R-4000 Relieving Regulator

Relieving pressure regulators are typically used to power pneumatic systems, such as:

  • Air tools
  • Small medical devices
  • Actuators
  • Spraying equipment
  • Blow-off nozzles

Non-Relieving Regulator


Non-relieving regulators are used for preventing dangerous or expensive gases and fluids from escaping in these settings:

  • Inert gas (i.e. nitrogen) applications
  • Gas tanks
  • Valuable gas
  • Propane fuel
  • Oxygen tanks

Relieving & Non-Relieving Regulator Solutions from Air Logic

Knowing the difference between a relieving and non-relieving regulator will help you make an informed decision for your application. Air Logic produces a vast selection of pneumatic equipment and control components, including relieving and non-relieving regulators.

Our Modular Subminiature Relieving Regulator is designed to regulate pressure accurately with minimal consumption. For non-relieving regulator applications, our Modular Subminiature Non-Relieving Regulator provides accurate pressure regulation without pressure bleeding.

To get started on a pressure regulator solution for your application, contact us or request a quote today.

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