Valves and Valve Equipment

Spring-Loaded Brass Check Valves: Working Principle and Selection Guide

Spring-loaded brass check valves are one of the simplest ways to prevent backflow in piping systems. Learn how they work, where they are used and what to consider when choosing one.

ORFA Technical TeamUpdated: Oct 30, 20262 min read

In many piping systems, from industrial plants to residential buildings, making sure the fluid flows in one direction only is critical for efficiency and safety. Check valves do exactly that. A spring-loaded brass check valve closes quickly as soon as flow stops, providing reliable backflow protection.

What Is a Spring-Loaded Brass Check Valve?

A spring check valve lets the fluid pass freely in one direction and automatically blocks flow in the opposite direction. When flow stops, the internal spring pushes the disc back onto its seat and prevents backflow. Brass is widely used for the body thanks to its corrosion resistance and good machinability.

Working Principle

Forward flow: when the fluid flows in the correct direction, its pressure overcomes the spring force and the disc opens.
Passage: the open disc lets the fluid pass freely.
Backflow prevention: when flow stops or reverses, the spring closes the disc quickly.

The fast-closing action of the spring also reduces pressure surges caused by reverse flow.

Benefits

Reliable backflow prevention: the spring ensures fast and positive closing.
Corrosion resistance: the brass body offers long service life with water and many other fluids.
Tight sealing: quality seal materials and precise machining.
Flexible mounting: thanks to the spring, it can be installed in horizontal and vertical lines.
Easy installation: threaded connections allow quick mounting.

Applications

Heating and cooling systems
HVAC installations
Water supply lines and booster sets
Compressed air lines
Natural gas lines (with suitably certified models)

Typical Specifications

Property	Value
Body material	Brass
Spring material	Stainless steel
Connection	Threaded (female-female)
Nominal size	DN15 (1/2″) – DN50 (2″)
Working pressure	Up to 16 bar
Temperature range	-10 °C to +110 °C

Values may vary by model and manufacturer; check the product page for exact data.

Selection Criteria

Fluid type: the chemistry and temperature of the fluid must suit the seal and body materials.
Pressure and temperature: system values must not exceed the valve’s ratings.
Connection size: choose a size that matches the pipe diameter.
Cracking pressure: in low-pressure systems, consider the pressure drop created by the spring.

Frequently Asked Questions

Can a spring check valve be installed vertically?

Yes. Because the spring closes the disc regardless of orientation, spring check valves can be used in both horizontal and vertical lines.

What should be considered during installation?

The arrow on the body shows the flow direction and the valve must be installed accordingly. A clean line and a strainer upstream extend service life.

Conclusion

Spring-loaded brass check valves are a practical, economical and reliable way to prevent backflow. Explore our check valve product group or ask our technical team to help you choose the right size and material.

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