Reinventing Pressure Relief Valves

Balanced Diaphragm and Bellows Leak Detection

Innovative Technologies Improving Performance and Lowering Emissions

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Crosby™ Balanced Diaphragm

The Crosby J-Series with Balanced Diaphragm technology eliminates the need for

bellows in pressure relief valves, providing lower costs and improved performance.

Features and Customer Benefits

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 standard 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.

Crosby™ Bellows Leak Detection

The Crosby J-Series Bellows Leak Detection solution ensures balanced operation,

reduces fugitive emissions and provides instant notification of a bellows failure.

Features and Customer Benefits

Instant notification of bellows rupture allows effective maintenance protocol.
Detection of small ruptures, from 0.0009in² (D orifice).
Ensured balanced operation after bellows rupture enhances safety.
Leakage volumetric calculation in real-time for risk assessment and decision making.
Over 90% reduction of leakage through bonnet vent.
Easily enhance existing Crosby J-Series with Bellows Leak Detection upgrade kits.