CROSBY J-SERIES

Direct Spring Pressure Relief Valves

Product Overview

The CROSBY J-Series Direct Spring Pressure Relief Valves are engineered to provide dependable and accurate overpressure protection across a wide range of industrial applications. Designed with robust construction and backed by more than 140 years of engineering expertise, the J-Series delivers reliable performance in services involving air, gas, steam, vapor, liquid, and two-phase media.

Widely recognized throughout the oil & gas, petrochemical, chemical processing, and power generation industries, the Crosby J-Series combines rugged durability, operational flexibility, and global code compliance to meet both standard and highly demanding process requirements.

General Application

The Crosby J-Series Pressure Relief Valve is designed to protect pressurized systems and equipment against excessive pressure conditions. Its versatile design makes it suitable for both conventional and severe service applications, providing safe and efficient pressure relief in critical process systems.

Applications include:

• Oil & gas processing facilities

• Petrochemical plants

• Refineries

• Power generation systems

• Chemical processing industries

• Industrial utility systems

• Steam and vapor systems

• Liquid and two-phase flow services

Technical Specifications

Valve Sizes

• Inlet Sizes:

  • 1” D through 12” W

  • 25D50 through 200T250 (EN Type)

Orifice Areas

• 0.110 to 60.75 in²

• 71 to 39,193 mm²

Pressure Ratings

ANSI Classes

• Class 150

• Class 300

• Class 600

• Class 900

• Class 1500

• Class 2500

EN Pressure Classes

• PN 10

• PN 16

• PN 25

• PN 40

Temperature Range

• Operating Temperature:

  • -450°F to +1000°F

  • (-268°C to +538°C)

Set Pressure Ranges

Design Features

Performance & Reliability

• Proven direct spring-operated pressure relief valve technology

• Robust and simple valve construction for dependable long-term operation

• Suitable for air, gas, steam, vapor, liquid, and two-phase applications

• Full nozzle configuration for optimized flow performance

• Adjustable blowdown capability to minimize product loss

• Restricted lift option available for specific service requirements

• Soft seat options available for enhanced seat tightness and leakage control

Certifications & Compliance

The Crosby J-Series is fully compliant with major international pressure relief standards and certifications, including:

• ASME Section VIII

• ASME Section XIII

• API 526

• API 527

• EN 4126

• PED / CE Requirements

• National Board (NB) Certified Capacities for:

  • Air

  • Water

  • Steam

The valves are certified for applications above:

• 15 psig (1.03 barg)

Advanced Technology Options

Balanced Diaphragm Technology

Available balanced diaphragm configurations improve valve performance in applications with variable backpressure conditions.

Emissions Monitoring

Optional wired or wireless volumetric emissions monitoring systems are available for enhanced environmental compliance and operational diagnostics.

Bellows Leak Detection

Optional bellows leak detection systems provide additional safety and reliability for critical process applications.

Dual Capacity Certification

Available dual capacity certification in accordance with:

• ASME Code Case 2787

Maintenance & Serviceability

• Interchangeable components help reduce spare parts inventory and maintenance costs.

• Designed for easy maintenance and simplified servicing procedures.

• Rugged internal construction improves operational life and reduces downtime.

Connection Options

Available with inlet and outlet flange connections in accordance with:

• ASME Standards

• EN 1092-1

Typical Applications

• Pressure vessel protection

• Boiler and steam systems

• Compressor systems

• Process piping protection

• LNG and cryogenic systems

• Refinery process units

• Chemical reactors

• High-pressure gas systems

Advantages

• Proven global industry reliability

• Broad pressure and temperature capabilities

• Compliance with international standards

• Flexible configuration options

• Long service life with reduced maintenance requirements

• Suitable for severe and critical service conditions