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(603) 886-9400 | Distributor Login

What is the difference between a relieving and non-relieving regulator?

Visually from the outside, there is usually no difference between a relieving and non-relieving regulator.  Functionally there is a major difference.  A relieving regulator can bleed pressure from downstream if the pressure rises above the setpoint, even in a no-flow condition.  Normally this is done by a relief valve (or hole) in the center of the diaphragm and the pintle assembly. A large majority of pressure regulator applications use a relieving regulator.

Non-relieving Regulator

Figure 1: Relief Valve

You can see the small hole that the pintle closes against when the downstream pressure is at or below the set point.  If downstream pressure builds, the diaphragm, with attached relief seat, will lift off of the pintle and let pressure escape into the atmosphere.  Here are some reasons why downstream pressure would build:

  • Mechanical forces acting on a cylinder
  • Changes in temperature of a downstream system
  • Filling of liquid in a vessel for a tank blanketing application

The non-relieving regulator does not have the relief hole in the diaphragm assembly.  These types of regulators are normally used in steady flow applications, which rely on this constant flow to eliminate the possibility that downstream pressure will build past the regulator set point.   When using a non-relieving regulator, we would always recommend having some type of downstream pressure relief capability to protect process, equipment and life.   Some reasons to use a non-relieving regulator would be:

  • Constant flow application with some downstream relief already in place
  • To eliminate the possibility of relief exhaust through the regulator which would prevent hazardous or expensive air or gas from escaping from the regulator.

We do not recommend non-relieving regulators for non-flowing or “dead ended” applications without other means to relieve downstream pressure. Without a relief valve the tendency in this case is for the downstream pressure to increase to supply pressure.

Most ControlAir regulators have a non-relieving option.  If you are unsure which type to use, please feel free to contact our support team by email, phone or our chat feature on our website.

Email: [email protected]

Phone: 603-886-9400 x 103

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  • Type 350 Stainless Steel Air Filter Regulator

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Industries We Serve
  • Food & Beverage
  • Oil & Gas
  • Control Valve
  • Water Treatment

Products

  • Pressure Regulators
  • Back Pressure Regulators
  • Filter Regulators
  • Precision Pressure Regulators
  • Pressure Regulators
  • Stainless Steel Regulators
  • Potable Water Pressure Regulators
  • Gauges and Accessories
  • Pressure Transducers
  • I/P Transducers (current-to-pressure)
  • E/P Transducers (voltage-to-pressure)
  • P/I Transducers (pressure-to-current)
  • I/PAC Integrated Process Air Control
  • Supply Manifold
  • Gauges and Accessories
  • Diaphragm Air Cylinders
  • Rolling Diaphragm Cylinder
  • Small Bore Compact Cylinder
  • Mini Might Cylinders
  • Pneumatic Air Filters
  • Air Relays
  • Vacuum Regulators
  • Valve Positioners
  • Volume Boosters
  • Stainless Steel Volume Boosters
  • View All Products
Resources
  • Blog
  • CAD Models
  • Certifications
  • Catalogs
  • FAQ
  • How to Determine the Appropriate Regulator
  • Product Selection Guides
  • Whitepapers
  • Visual Product Reference Guide
  • Videos

ControlAir

International HQ
8 Columbia Dr
Amherst, NH 03031 USA

603-886-9400
1 (800) 216-3636
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