Overview
The Flexi-Hinge 1-502M-1330 check valve is a precision-engineered, seatless check valve with a 1″ NPT male pipe thread connection. Designed to prevent liquid or gas flow reversal in hydraulic, pneumatic, pump, and plumbing systems, this valve delivers low-pressure drop and maintains full-port flow characteristics. Made in the United States, it combines robust carbon steel construction with aluminum internals and silicone seals for reliable performance in industrial and commercial applications.
Key Features
- Seatless, full-port double-disc design for maximum flow area and minimal pressure drop
- 1″ NPT male pipe thread ends for standard industrial connections
- Carbon steel body with aluminum internals and silicone seal
- No spring design allows low-pressure operation
- Avoids metal-to-metal rotating points for long service life
- Rated for 200 PSI maximum working pressure
Technical Specifications
This check valve meets the demands of high-flow applications while maintaining simple, reliable operation. The seatless design eliminates common wear points found in traditional spring-loaded check valves.
Typical Applications
- Hydraulic pump and motor circuits
- Pneumatic air systems and compressors
- Industrial fluid power applications
- Backflow prevention in plumbing and utility systems
- Mobile equipment and machinery
Compatibility & Replacements
Compatible With
- Standard 1″ NPT hydraulic and pneumatic piping systems
- ISO 4401 cavity mounting in proportional valve blocks (verify cavity dimensions)
- High-pressure fluid power circuits up to 200 PSI
- Air and non-corrosive fluid media
Replaces / Drop-In Replacement For
- Earlier Flexi-Hinge 502M series 1-inch check valves
- Generic 1″ NPT seatless check valves with similar specs
- Verify interchangeability with your system integrator or hydraulic specialist before ordering
Works With
- Standard NPT threaded ports and manifolds
- ANSI B4.1 industrial piping standards
- ISO 4572 fluid power system components
- Universal high-pressure fluid power platforms
