Overview
The Neptune 5027K51 RV-C20 pressure relief valve is a proven safety component for protecting piping systems and equipment from overpressure damage. The Neptune RV-316 and RV-C20 is a simple safety pressure relief valve. It is intended for liquid service only. With 1/2-inch threaded inlet and outlet ports, this valve integrates seamlessly into existing plumbing and hydraulic systems.
Key Features
- Neptune’s exclusive relief valve design utilizes a unique spring guide which assures proper spring loading and consistent relief capacity.
- Neptune’s relief valves use a self-cleaning ball check and seat.
- The relief pressure setting can easily be changed by removing the top cap screw and locking set screw, inserting a proper allen wrench into the opening and adjusting the spring to the desired pressure.
- Stainless steel wetted parts deliver corrosion resistance and durability
- Neptune’s Relief Valves protect the piping and system from overpressure. If released, the relief valve discharge is piped to a tank in order to prevent any system or piping damage.
Technical Specifications
- Connection Size: 1/2″ FNPT (inlet and outlet)
- Service Type: Liquid only
- Valve Design: Spring-loaded, direct-acting relief
- Check Valve: Self-cleaning ball check and seat
- Adjustment Method: Allen wrench (top cap removal required)
- Body Material: Stainless steel (316SS or 304SS options available)
- Maximum Pressure Range: Adjustable across multiple pressure ranges
Typical Applications
- RV and mobile home water systems
- Trailer pressure protection
- Residential and light commercial plumbing
- Hydraulic and pneumatic system overpressure protection
- Water heater and boiler safety systems
- Any liquid service requiring reliable pressure relief
Compatibility & Replacements
Compatible With
- 1/2″ FNPT male and female threaded connections
- Standard water and hydraulic fluid systems
- Pressures up to 2000 PSI (depending on model variant)
- Liquid service applications requiring adjustable relief valves
Replaces / Drop-In Replacement For
- Neptune RV-C20 models (direct replacement)
- Neptune RV-316 variants (confirm pressure range and port size)
- Verify specific model compatibility with your system integrator before ordering
Works With
- Any standard 1/2-inch threaded piping (FNPT)
- Water, hydraulic fluid, and compatible liquid media
- Existing system pressure gauges and monitoring equipment
