What is the function of a non-return valve?
Non-return valves perform essential functions in process systems:
- Prevent reverse flow that can damage equipment.
- Protect pumps, compressors and pipelines.
- Maintain system pressure and avoid contamination.
- Reduce the risk of water hammer and retain pump prime.
How does a non-return valve work?
These valves rely on the process fluid to operate: forward pressure opens the internal element (ball, disc, diaphragm, etc.), and reverse flow forces it closed. No external actuation is required — operation is automatic and purely pressure-driven.
Common non-return valve types
- Diaphragm non-return valves
- Swing (flapper) check valves
- Lift check valves
- Ball check valves
- Spring-loaded inline check valves
What is a non-return valve used for in real applications?
1. Pumping systems
Non-return valves stop backflow and protect pumps from reverse rotation and pressure surges. They are commonly fitted on pump discharge and suction lines to preserve prime and avoid damage from back-pressure.
Case example: In a biscuit production facility, BM Engineering supplied sanitary ball valves, pneumatic actuators and check valves as part of a steam condensate recovery skid — preventing backflow and protecting downstream equipment.
Recommended: INOXPA check valves | Pneumatic actuators
2. Industrial & process systems (pharmaceutical, chemical, power)
In high-purity and high-pressure systems, non-return valves prevent contamination and ensure correct flow direction during dosing, transfer and CIP (clean-in-place) cycles. They are also used in fuel lines, cooling circuits and safety relief arrangements.
Pharma applications often demand stainless steel, hygienic finishes and traceable materials — all available through BM Engineering’s valve range.
3. Domestic & utility systems
From potable water services to sprinkler systems and underfloor heating, non-return valves prevent contaminated or heated water from flowing back into the mains. Compact hygienic mini check valves are ideal where space and cleanliness matter.
Featured: INOXPA non-return valves
INOXPA non-return valves are widely used in hygienic processing because they:
- Prevent water hammer and protect equipment
- Retain pump prime in critical systems
- They are available in Tri-Clamp, DIN 11851, RJT and welded options
Explore the full INOXPA product range, including pumps, valves and fittings for hygienic processes.
How to choose the right non-return valve
Valve selection depends on media, pressure, temperature, port connections and hygiene requirements. Wrong selection can cause leak paths, noise, premature wear or safety hazards.
BM Engineering offers expert selection support and stocks brands such as INOXPA, Bürkert, Valsteam ADCA and Zwick. Contact our technical sales team for tailored recommendations.
Ordering & support
Need help selecting a non-return valve for your application?
🛒 Browse our non-return valve range
📞 Call BM Engineering Supplies on 0141 762 0657
✉️ Email: sales@bmengineering.co.uk
