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Pressure & Vacuum Relief Valves

Blocker & Wallace Service offers a variety  relief valves from the leading manufactures including Kunkle, Dixon Bayco and more.. We stock  various types including, pressure relief valves and vacuum relief valves which are also available in a wide range of construction materials and sealing materials to suit your application for air systems to corrosive gas conveying systems.  Relief valves should be properly sized per application, including CFM requirements & overall system design.  Please contact us sales@blockerandwallace.com. for relief valve sizing assistance or if you don't see the specific relief valve you require.

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The Best Pressure Relief Valves Around

The Best Pressure Relief Valves Around

Get dependable, high-quality pressure relief valves engineered to perform under the toughest conditions. Whether you need a vacuum relief valve or a spring-loaded pressure relief valve, you'll find the best brands built to suit your application in our online store. Choose from different pressure relief valve types with the diameter and PSI setting you need. Our selection of pressure relief valves will protect your pipelines and storage tanks from excessive pressurization.

Vacuum Relief Valves For Negative Pressure Systems

A reliable vacuum relief valve could save you thousands of dollars in costly repairs. Vacuum relief valves are responsible for maintaining the balance of negative pressure within a closed system. Too much vacuum can cause catastrophic failure in your pipes, HVAC system, storage tank or hydraulic system. Our vacuum relief valves are made using a bayloy body with a bronze poppet for the best corrosion resistance and durability.

Frequently Asked Questions About Our Pressure and Vacuum Relief Valves

Learn more about the pressure and vacuum relief valves available at Blocker and Wallace. Get more information about our products and how they are used with some of our frequently asked questions.


What Are the Major Types of Pressure Relief Valves?

The two prominent varieties of pressure relief valve both work to keep your systems safe. Pressure relief valves seek to release excessive pressure from systems to maintain operational levels. By contrast, vacuum relief valves allow air to enter into negative pressure (vacuum) systems to prevent an excess buildup of vacuum, which can cause damage to sensitive systems and components.


Who Uses Vacuum Relief Valves?

Several industries use vacuum systems in their day-to-day operations. Used for everything from equipment to pipelines, storage tanks and processing systems, the industries that use vacuum relief valves include:

  • Oil and Gas
  • Power Generation
  • Petrochemicals
  • Food and Beverage
  • Pharmaceuticals
  • Bulk Storage Tanks
  • Pulp and Paper
  • Water Treatment

What Is the Difference Between a Vacuum Relief Valve Vs. a Vacuum Breaker?

The primary use of vacuum relief valves is to prevent overpressurization within a closed system. It is a valuable safety device and helps to maintain pressure within operational guidelines. A vacuum breaker is used to prevent contaminated water from backflowing into a potable water supply. The vacuum breaker will automatically break the vacuum that could develop within your plumbing system and maintains normal atmospheric pressure to prevent contamination.

Order Your Relief Valves From Blocker and Wallace

For the safety of your workers and the reliability of your industrial systems, there's no better place to turn to than Blocker and Wallace. Our selection of vacuum and pressure relief valves will help you maintain your plumbing systems and industrial equipment for years to come. Make Blocker and Wallace your primary source of vacuum relief valves and pressure relief valves today.

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