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Crosby™ Balanced Diaphragm Crosby™ Balanced Diaphragm
Reinventing Pressure Relief Valves

Reinventing Pressure Relief Valves

The Crosby Balanced Diaphragm extends back pressure limits to 80% of set pressure and increases the Kb factor up to 15%, expanding the application range of spring-loaded PRVs. 

Diaphragms are inherently more resilient than bellows for higher back pressures and rapid pressure cycling applications. 

The Balanced Diaphragm technology lowers maintenance costs, improves reliability and increases safety.      
 

50-Year Technology Makeover: Cutting-Edge Advancements Take the Lead!

Reliability

Improved durability of diaphragm backed by extensive testing.

Productivity

Improvement in Kb factor enables sizing of smaller and/or fewer valves.

Safety

Reliable and longer life ensuring balanced operation.

Environmental

Durable and robust design
for protection against
fugitive emissions.

Are Your Bellows Damaged and Failing?

The Crosby ™ Balanced Diaphragm Technology eliminates the need for bellows in PRVs

We have the Crosby™ Balanced Diaphragm in stock and ready for IMMEDIATE Shipment.

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The Crosby Balanced Diaphragm difference

The Crosby Balanced Diaphragm difference

  • 20% greater back pressure handling improves reliability during back pressure surges
  • 15% improvement in Kb factor enables sizing of smaller and/or fewer valves 
  • 100x more resilient than metal bellows for high-frequency cycling, ensuring safety
  • Same springs as JOS valves reducing spare parts and inventory costs
  • Cycle, burst and fire tested and independently witnessed by Lloyd’s Register 
  • Easily convert existing Crosby J-Series with Balanced Diaphragm upgrade kits
Performance Tests
Balanced Diaphragm

Performance Tests

Significant improvement in back pressure limits to 80% of set pressure and increases the Kb factor up to 15%, expanding the application range of spring-loaded PRVs.
How It Works

How It Works

The diaphragm effective area subjected to back pressure has the same area as the nozzle seating area, ensuring balanced operation.  

Its location is above the guide and not in the main flow path of the media. Therefore, it reduces exposure to the media, improving reliability and valve flow performance.