Non-return valve BA295-3/4A Backflow preventer, threaded, 3/4 inch, with union nuts BA295S-3/4A

Backflow prevention valve – protection for installations and drinking water

This backflow prevention valve, designated BA295-3/4A, is a reliable solution for protecting water installations from backflow and potential contamination. It is a backflow preventer designed for installation in drinking water systems, both in residential and industrial buildings. Its construction based on dezincification-resistant brass (DZR) guarantees durability and corrosion resistance.

This valve combines the functions of several elements – two check valves and a drain valve – creating a triple protective barrier. The internal space of the valve is divided into three pressure zones, which increases the effectiveness of protection. A built-in filter at the inlet additionally protects the installation from impurities. It is worth noting that replacing the valve’s internal element is simple and does not require dismantling the entire structure.

Construction and application

The BA295-3/4A valve has been designed with ease of installation and maintenance in mind. It has 3/4 inch threaded connections, which facilitates integration with the existing installation. It is intended for horizontal mounting with a bottom drain valve. Thanks to its compact design and streamlined construction, it ensures minimal pressure loss while maintaining high flow rate (3.5 m³/h). A Kvs value of 3.5 confirms its flow efficiency.

The application of this valve is wide – it is ideal for anywhere where protection against backflow is required in accordance with EN 1717 standard (BA protection, fluid category 4). It also meets the KTW recommendations regarding contact with drinking water. Therefore, it can be used in drinking water supply systems, heating installations and other applications requiring a high level of hygienic safety.

Key features and benefits

• Triple protection: Two check valves and a drain valve provide comprehensive protection against back contamination.
• Built-in filter: Protects the installation from mechanical impurities, extending the life of the system.
• Easy internal element replacement: Enables quick and easy maintenance without the need to disassemble the entire valve.
• Low pressure drop: Ensures efficient water flow with minimal pressure loss (pressure drop at nominal flow is 1 bar).
• Durable construction: Made of dezincification-resistant brass (DZR), guarantees long-term reliability.
• Compliance with standards: Meets the requirements of EN 1717 and KTW standards, ensuring safe use.
• 5-year warranty: Confirms the high quality of the product and gives confidence in long-term operation from the date of manufacture.
• Minimal noise level: Class 2 ensures comfortable use without disruptive operating noise.

The BA295-3/4A backflow prevention valve is an investment in the safety and reliability of your water installation – for both professionals and end users.