Crosby™ J-Series Direct Spring Pressure Relief Valves

The Crosby™ J-Series Direct Spring Pressure Relief Valves, manufactured by Emerson, are industry-leading safety valves engineered to deliver reliable overpressure protection across a wide range of industrial applications. Built on decades of proven performance, the J-Series combines robust design, versatile configuration options, and exceptional set-pressure accuracy, making it one of the most trusted relief valve families in the world. Designed for air, gas, steam, and liquid services, the J-Series offers flexible trim combinations, multiple orifice sizes, and material selections to meet the stringent requirements of the oil and gas, refining, petrochemical, power generation, industrial processing, and LNG sectors. With fast response, repeatable opening characteristics, and superior seat tightness, these valves provide dependable protection for pressure vessels, pipelines, compressors, and process equipment. The J-Series’ direct spring-loaded design ensures dependable operation even under severe conditions, while its modular construction simplifies maintenance and reduces lifecycle costs.

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.

Technical Specification of Crosby™ J-Series Direct Spring Pressure Relief Valves

• Valve Type: Direct spring-operated pressure relief valve

• Orifice Sizes: Multiple ASME/API standardized sizes

• Pressure Classes: ASME Class 150 to Class 2500

• Body Materials: Carbon steel, stainless steel, alloy steel, bronze, and special materials upon request

• Temperature Range: Cryogenic to high-temperature service options

• Connections: Threaded, flanged, and welded end connections

• Set Pressure Range: Wide range starting from low to very high pressure depending on model

• Seat Options: Metal or soft seat

• Leakage Standards: API 527 seat tightness requirements

• Certifications: ASME Section I & VIII, PED, ISO standards