Overview
The MAC 55B-11-PI-590JJ is a 3-way balanced spool solenoid valve designed for precision fluid control in pneumatic and hydraulic systems. Manufactured by MAC Valves, a leader in pilot-operated solenoid valve technology, this unit features direct-acting balanced poppet pilot control and a 24VDC (2.5W) solenoid operator. The 30-150 PSI pressure range and internal pilot air configuration make it suitable for a wide variety of industrial automation, machinery, and fluid power applications.
Key Features
- Balanced spool design — unaffected by back pressure in exhaust or inlet restrictions
- 24VDC solenoid actuation — 2.5W power consumption for efficient operation
- Internal pilot operation — can be converted to external pilot by rotating adaptor
- Accumulator supplied — large checked accumulator for consistent pilot supply and spring return
- Flow coefficient (Cv) of 1.4 — enables efficient fluid flow control
- Square DIN 43650 connector — standard electrical interface for reliable connections
Technical Specifications
- Series: MAC 55
- Part Number: 55B-11-PI-590JJ
- Valve Type: 3-Way, 2-Position Normally Closed (NC)
- Configuration: Balanced Spool Piston Valve
- Operating Pressure Range: 30–150 PSI (2.1–10.3 bar)
- Solenoid Voltage: 24VDC
- Power Consumption: 2.5W
- Pilot Control: Internal Pilot Air (interchangeable to external)
- Flow Coefficient (Cv): 1.4
- Port Type: 1/4″ NPTF female threaded ports (main); 3/8″ NPTF female exhaust
- Electrical Connector: Square DIN 43650 plug-in connector
- Mounting: Individual inline installation
- Dimensions (H × W × D): 113mm × 46mm × 105mm
- Medium: Pneumatic/Hydraulic fluid (lube or non-lube service)
- Operation: Monostable (spring-reset)
Typical Applications
The MAC 55B-11-PI-590JJ is commonly used in:
- Pneumatic and hydraulic control circuits for industrial machinery
- Pump discharge and cylinder control systems
- Plumbing and water pressure management systems
- Test benches and lab automation equipment
- OEM equipment requiring compact, high-flow pilot-operated solenoid control
- Applications requiring interchangeable internal/external pilot configurations
Compatibility & Replacements
Compatible With
- Pneumatic and hydraulic fluid power systems rated 30–150 PSI
- 24VDC control circuits with standard industrial PLC and relay logic systems
- Square DIN 43650 connector-based electrical harnesses and valve manifolds
- Vacuum-to-150 PSI service (field-convertible per MAC design)
- Lube and non-lube fluid media applications
Replaces / Drop-In Replacement For
- 55B-11-PI-590JA (earlier variant with same core function; verify pilot orientation before substitution)
- Other 55 series 3-way balanced spool pilots with 24VDC, 2.5W, 1/4″ NPTF configuration
- Verify specific connector type (JJ = square connector without light) before ordering replacement
Works With
- MAC Valves 55 series main valve bodies and modular pilot assemblies
- Standard DIN 43650 industrial solenoid electrical connectors and enclosures
- Pneumatic/hydraulic proportional control systems and circuit logic
- Manual operators and solenoid enclosure options from MAC Valves
- Field-interchangeable pilot modules (internal-to-external pilot conversion kit)
