Crosby™ J-Series Direct Spring Pressure Relief Valves
J-Series valves provide high quality and dependable overpressure protection for air, gas, steam, vapor, liquid and two-phase applications in one simple design. Now available with two new to the world technologies, Balanced Diaphragm and Bellows Leak Detection
The Crosby™ J-Series Direct Spring Pressure Relief Valves, designed by Emerson, are high-performance safety relief valves engineered to provide dependable overpressure protection for a wide range of industrial applications. Known globally for reliability and precision, the J-Series offers versatile, ASME-certified pressure relief solutions for steam, gas, air, and liquid systems. These valves feature a direct spring-loaded design that ensures quick, accurate opening at set pressure and tight reseating once normal conditions are restored. The Crosby J-Series is available in multiple configurations, materials, and pressure ratings to meet diverse process requirements across industries such as oil and gas, power generation, petrochemical, refining, and manufacturing. With over a century of proven field experience, Crosby safety valves are recognized for their exceptional performance, longevity, and ease of maintenance, making them the standard choice for protecting pressure vessels, pipelines, and critical process systems.
Technical Specification of Crosby™ J-Series Direct Spring Pressure Relief Valves
Feature of Crosby™ J-Series Direct Spring Pressure Relief Valves
- ASME/NB certified capacities for air, water and steam.
- Full compliance with all major global pressure relief standards including ASME VIII, XIII, API 526/527, EN4126 and PED/CE.
- Highly customizable to meet most applications.
- Interchangeable parts to reduce maintenance costs.
- Full nozzle configuration.
- Simple and reliable design for easy maintenance.
- Soft seat options for superior seat tightness.
- Adjustable blowdown to reduce product loss.
- Restricted Lift available.
- Wired or Wireless Relief Monitoring available.
- Crosby™ Balanced Diaphragm
- 20% greater backpressure handling improves reliability during backpressure 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.
- Easily convert existing Crosby J-Series with Balanced Diaphragm upgrade kits
- Crosby™ Bellows Leak Detection available
- 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.