Crosby J Series Direct Spring Safety Relief Valve
Product Overview
The Crosby J Series Direct Spring Safety Relief Valves are engineered to deliver reliable and versatile overpressure protection for a wide range of industrial applications, including air, gas, steam, vapor, liquid, and two-phase media. Backed by over 140 years of engineering expertise, these valves comply with ASME Section VIII, API 526/527, and PED/CE standards, ensuring global applicability. Featuring innovative technologies like Balanced Diaphragm and Bellows Leak Detection, the J Series offers enhanced backpressure handling, reduced emissions, and simplified maintenance, making it a proven solution for oil and gas, chemical processing, and power industries.
Key Features
- Versatile Design: Suitable for air, gas, steam, vapor, liquid, and two-phase applications in one robust design.
- ASME/NB Certified: Meets ASME Section VIII, XIII, API 526/527, EN4126, and PED/CE standards for global compliance.
- Balanced Diaphragm Technology: 20% greater backpressure handling, 15% improved Kb factor, and 100x more resilient than metal bellows.
- Bellows Leak Detection: Instant notification of bellows rupture with over 90% reduction in leakage and real-time volumetric data.
- Interchangeable Parts: Reduces maintenance costs and downtime with modular components.
- Full Nozzle Configuration: Enhances durability and simplifies installation.
- Soft Seat Options: Provides superior seat tightness for minimal leakage.
- Adjustable Blowdown: Minimizes product loss during operation.
- Wired/Wireless Monitoring: Optional relief monitoring for enhanced safety and efficiency.
Technical Specifications
| Parameter |
Specification |
| Sizes |
1" D 2" to 12" W 16" (DN 25 to DN 400) |
| Orifice Sizes |
0.110 to 60.75 in² (71 to 39,193 mm²) |
| Inlet Ratings |
ANSI Classes 150, 300, 600, 900, 1500, 2500; EN Classes PN 10, PN 16, PN 25, PN 40 |
| Set Pressure Range |
5 to 6000 psig (0.35 to 413.79 barg) for JOS-E; 15 to 6000 psig (1.03 to 413.79 barg) for JLTJOS-E; 25 to 6000 psig (1.72 to 413.79 barg) for JBS-E/JBSBP-E; 25 to 1480 psig (1.72 to 102 barg) for JDS-E/JLTJDS-E |
| Temperature Range |
-450°F to 1000°F (-268°C to 538°C) |
| Body Materials |
Carbon steel (SA 216 WCB), stainless steel (SA 351 CF8M), special alloys |
| Bellows Material (Optional) |
Stainless steel, elastomer |
| Seat Gasket |
Metallic, sealing plate, O-ring soft seal |
| Load Type |
Direct spring-loaded |
| Certifications |
ASME Section VIII, XIII, API 526/527, EN4126, PED/CE, AQSIQ, EAC |
Applications
The Crosby J Series valves are optimized for a wide range of industrial applications:
- Oil and Gas: Protects upstream, midstream, and downstream processes from overpressure.
- Chemical Processing: Ensures safety in reactors, distillation columns, and waste gas systems.
- Power Generation: Safeguards steam and heat-transfer systems in power plants.
- Petrochemicals: Handles high-pressure refining and pipeline operations.
- Industrial Processes: Supports air, gas, vapor, and liquid systems in manufacturing.
Frequently Asked Questions
What fluids can the J Series handle?
The J Series is designed for air, gas, steam, vapor, liquid, and two-phase media, per ASME and API standards.
How does the Balanced Diaphragm technology improve performance?
It offers 20% greater backpressure handling, 15% improved Kb factor, and enhanced durability compared to metal bellows.
What is the Bellows Leak Detection feature?
It provides instant notification of bellows rupture, reduces leakage by over 90%, and offers real-time volumetric data.
Are these valves customizable?
Yes, they offer soft seat options, adjustable blowdown, and restricted lift for tailored performance.
How quickly can standard configurations be delivered?
Standard configurations are typically available in 2 weeks.
Contact Us
For more information about the Crosby J Series Safety Relief Valves, pricing, or to request a demo, contact our team:
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