Overview
The Parker 647B-2-1/4-2 is a precision-engineered soft seat relief valve designed for pneumatic and hydraulic system overpressure protection. Built from stainless steel (303SS), this relief valve delivers repeatable pressure control with minimal leakage. The 36 PSI nominal setting and 50 PSI maximum pressure rating make it suitable for low- to medium-pressure industrial applications requiring reliable flow control and pressure relief.
Key Features
- Stainless steel 303SS body for corrosion resistance and durability
- Soft seat design provides bubble-tight sealing and minimal leakage
- 36 PSI nominal setting with 50 PSI maximum pressure capacity
- Adjustable relief function for system customization
- Factory-preset and sealed for immediate installation
- Repeatable pressure control and consistent reseat performance
Technical Specifications
- Nominal Pressure Setting: 36 PSI
- Maximum Pressure: 50 PSI
- Port Size: 1/4 in NPT
- Port Connection Type: NPT (National Pipe Thread)
- Body Material: Stainless Steel (303SS)
- Seat Design: Soft Seat
- Preset: Factory-sealed and preset
- Applications: Pneumatic and Hydraulic Systems
Typical Applications
The Parker 647B-2-1/4-2 relief valve is commonly used in:
- Pneumatic compressor systems requiring overpressure protection
- Air tank pressure regulation and safety relief
- Hydraulic test equipment and pressure vessels
- Light industrial fluid power circuits
- Control systems where precise pressure limiting is critical
Compatibility & Replacements
Compatible With
- Pneumatic compressor systems and air tanks
- Hydraulic power units and circuits
- Standard 1/4″ NPT ported pneumatic and hydraulic manifolds
- Parker fluid power component networks
Replaces / Drop-In Replacement For
The Parker 647B-2-1/4-2 is a direct replacement for legacy Parker 303SS soft seat relief valves in the same pressure range and port configuration. Verify compatibility with your system integrator before ordering to ensure pressure rating match.
Works With
- Parker Hannifin pneumatic and hydraulic systems
- Standard NPT threaded pneumatic/hydraulic manifolds
- Low-pressure relief circuits (up to 50 PSI)
- Fluid power control networks using soft seat relief technology
