High Quality Direct Spring Pressure Relief Valve J-Series Crosby Pressure Reducing Valve and Rosemount Transmitter for Air, Water and Steam

The Emerson Crosby J-Series is a proven line of direct spring pressure relief valves designed for dependable overpressure protection across a wide range of media. Available in conventional (JOS-E/JLTJOS-E), balanced bellows (JBS-E/JLTJBS-E), and balanced diaphragm (JDS-E/JLTJDS-E) configurations, it offers flexibility for different backpressure conditions and service types, including liquid and two-phase applications.

• ASME/NB certified capacities for air, water, and steam.
• Full compliance with major global standards including ASME VIII, Section XIII, API 526/527, EN4126, and PED/CE.
• Highly customizable with interchangeable parts to reduce maintenance costs.
• Full nozzle configuration for reliable performance.
• Soft seat options (O-ring) for superior seat tightness.
• Adjustable blowdown to minimize product loss.
• Balanced designs (bellows or diaphragm) minimize effects of variable backpressure.
• Liquid trim (JLT) achieves full lift at 10% overpressure without chatter.

Sizes: 1" D 2" to 12" W 16" (or 25 D 50 to 200 T 250 in EN types). Orifices: 0.110 to 60.75 in² (71 to 39,193 mm²). Inlet Ratings: ANSI Classes 150 to 2500; EN Classes PN 10 to PN 40. Temperature Range: -450°F to +1000°F (-268°C to +538°C). Set Pressures:

• JOS-E: 5 to 6000 psig (0.35 to 413.79 barg)
• JLTJOS-E: 15 to 6000 psig (1.03 to 413.79 barg)
• JBS-E/JBSBP-E: 25 to 6000 psig (1.72 to 413.79 barg)
• JLTJBS-E/JLTJBSBP-E: 25 to 6000 psig (1.72 to 413.79 barg)
• JDS-E/JLTJDS-E: 25 to 1480 psig (1.72 to 102 barg) Code Compliance: ASME Section VIII and Section XIII (15 psig and above). Connections: Flanged (ANSI or EN1092-1 with Type B1 raised face standard); other facings available on request.

Ideal for overpressure protection in oil & gas, refining, chemical processing, power generation, and general industrial systems handling gas, steam, vapor, liquid, or two-phase media—especially where compliance with API/API 526 and global codes is required.

Q: What makes the J-Series suitable for variable backpressure? A: Balanced bellows (JBS-E) or diaphragm (JDS-E) designs minimize effects on set pressure.

Q: Does it handle liquid service well? A: Yes, JLT models use liquid trim for stable full lift at 10% overpressure.

Q: Are soft seats available? A: Yes, O-ring soft seats provide superior tightness.

Q: What certifications does it carry? A: ASME/NB certified capacities; compliant with ASME VIII/XIII, API 526/527, EN4126, PED/CE.

Q: Can blowdown be adjusted? A: Yes, adjustable blowdown helps reduce product loss.

Email: tracychen@gbsxj.com; tracy@gongboshi.com

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Consider the Crosby OMNI-TRIM Series 900 for smaller orifice needs, or explore pilot-operated options like Anderson Greenwood series for high-capacity applications.