Overview
The Apollo 61-503-01 is an in-line ball-cone check valve engineered for reliable reverse-flow protection in hydronic heating systems and general low-flow fluid applications. The Apollo® 61 Series “soft seat” check valve offers reliable tight shut-off protection against reverse flow and corrosion-resistance using proven ASTM quality materials made in the USA. With its 0.5 psi cracking pressure and EPDM seat material, this valve delivers precision control in sensitive systems where minimal back-pressure is required.
Key Features
- Soft seat allows more resistance to vibration and may be installed in both horizontal and vertical upward flow applications
- 316 Stainless Steel spring material resists corrosion in wet environments
- Inline ball cone mechanism design ensures compact installation footprint
- Spring-actuated operation with resilient EPR soft seat
- Ideally suited for hydronic heating and other low flow applications
- Made in the USA with proven ASTM quality materials
Technical Specifications
Port size: 1/2 inch, Connection type: FNPT x FNPT, Body material: Cast bronze, Seat material: EPDM, Spring material: 316 stainless steel, Cracking pressure: 0.5 psi, Maximum water pressure: 400 psi, Maximum steam pressure: 400 psi WSP, Flow rate: 1.4 gpm, Maximum operating temperature: 180°F, Minimum operating temperature: 33°F. Dimensions: Length 2 5/16 in, Width 1 1/8 in, Height 1 1/8 in.
Typical Applications
- Hydronic heating systems and boiler protection
- Low-flow circulation loops requiring bubble-tight shut-off
- Gaseous media applications with minimal cracking pressure requirements
- General-purpose industrial piping where reverse-flow prevention is critical
- Vertical and horizontal pipeline installations
Compatibility & Replacements
Compatible With
- Standard NPT (National Pipe Thread) piping systems
- Hydronic heating systems and boiler circuits
- Low-pressure steam and water applications
- Gaseous service applications
- ASTM B16 standard connection fittings
Replaces / Drop-In Replacement For
- Apollo 61-500 Series CVBE12 model designation
- Applications previously using 1/2″ FNPT soft-seat check valves with 0.5PSI cracking pressure
- Legacy bronze ball-cone check valves in hydronic heating systems
Works With
- FNPT (Female National Pipe Thread) connection systems
- Stainless steel and brass trim piping components
- Low-flow heating circulator pumps
- Water and glycol-based hydronic fluids
- Standard plumbing and HVAC components rated to 400 psi
