Crosby J-Series Pressure Relief Valve

Emerson Express

Two new technologies for the Crosby J-Series pressure relief valve product line

The Crosby J-Series with Balanced Diaphragm technology eliminates the need for bellows in pressure relief valves, providing lower costs and improved performance.

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

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The second technology, Bellows Leak Detection, addresses the problem of bellows failures, which are challenging to detect and often remain unnoticed for years until the valve is removed for periodic service. Leak detection and repair (LDAR) programs may include PRVs, but their target sources for leakage detection are flanges or valve seats, so bellows ruptures will generate fugitive emissions through the PRV bonnet vent that may not be in the LDAR scope. In addition, PRV installations are often difficult to access and in hazardous locations, making leak detection difficult.

The Bellows Leak Detection solution is a safer and more efficient method for detecting bellows failures and emissions. It consists of a backup piston and a Rosemount™ wireless or wired pressure transmitter. The backup piston can reduce emissions by over 90% in the event of a bellows rupture because it has a much smaller clearance than a standard bonnet vent, and it ensures balanced operation. The pressure transmitter provides instant timestamped notification of bellows failure and emissions volume data in real-time.

Upgrade kits for existing Crosby J-Series PRVs are available for both new technologies, and new PRVs can be purchased with these features pre-installed.

Watch the Crosby™ JDS-E Balanced Diaphragm Animation:

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

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