Overview
The Crosby JMBL61CA is a direct spring pressure relief valve rated for 300 PSIG, engineered for use in hydraulic, pneumatic, and plumbing systems. Part of Crosby’s J-Series family, this valve provides reliable overpressure protection by automatically relieving excess system pressure to prevent equipment damage. The JMBL61CA uses a direct spring mechanism with a pop-type lift action, meeting ASME Boiler and Pressure Vessel Code certification requirements.
Key Features
- 300 PSIG maximum pressure rating for industrial and commercial service
- Direct spring relief design with certified pop-type lift action
- ASME-certified capacity in accordance with ASME Boiler and Pressure Vessel Code Section VIII
- Durable carbon steel construction with precision-engineered seat and disc insert
- Balanced valve design insensitive to back pressure variation
- Two-piece disc holder and disc insert for uniform seat contact and thermal balancing
Technical Specifications
- Pressure Rating: 300 PSIG (20.7 bar)
- Valve Type: Direct Spring Relief, J-Series
- Valve Body Material: Carbon Steel (ASTM A216 Grade WCB)
- Seat Configuration: Metal-to-metal or soft seat (verify trim type)
- Overpressure Setting: Adjustable (standard pop lift at 3–5% overpressure)
- Bonnet Type: Screwed cap (Type J standard)
- Connection Type: Flange (ASME standard dimensions)
- Certifications: ASME Boiler and Pressure Vessel Code Section VIII certified by National Board of Boiler and Pressure Vessel Inspectors
- Service Media: Hydraulic fluid, water, air, and compatible industrial fluids
Typical Applications
- Hydraulic power systems and machine tools
- Plumbing and water supply systems overpressure protection
- Pneumatic systems and compressed air equipment
- Industrial process vessels and piping networks
- OEM thermal relief and overpressure safety applications
Compatibility & Replacements
Compatible With
- Crosby J-Series valve installations and configurations
- ANSI/ASME flanged connection standards (standard lap joint stub end)
- Industrial hydraulic systems rated for 300 PSIG operation
- Plumbing and water piping networks up to 300 PSIG
- Pneumatic and air service applications within pressure rating
Replaces / Drop-In Replacement For
- Other Crosby J-Series 300 PSIG direct spring relief valves with matching flange configuration and trim type
- Verify specific trim type, connection size, and bonnet configuration before ordering as drop-in replacement
Works With
- ASME-certified system design and pressure relief calculations
- Crosby valve sizing and selection software
- Standard ANSI flange connections and piping systems
- Industrial maintenance and pressure testing protocols per API and ASME standards
