Anti-contamination valve class BA, DN20, FIG.406 406E020B34

A class BA anti-contamination valve with nominal diameter DN20 (3/4 inch) is a reliable solution for protecting water supply systems against contamination and backflow. The design complies with EN1717 and EN12729 standards, ensuring safety and adherence to current regulations. Manufactured by ZETKAMA Sp. z o.o., this valve features a compact design that facilitates installation even in confined spaces.

Construction features and applications

The class BA anti-contamination valve incorporates a built-in pressure-reducing mechanism, minimizing the risk of system damage caused by excessive pressure. Constructed from bronze (for DN20) and brass (for smaller sizes), it guarantees durability and corrosion resistance. The silicone seal ensures long-term tightness and reliable operation. Designed for use with clean liquids, this valve is suitable for residential, commercial, and industrial buildings where protection of potable water from contamination is required. Installation must be performed exclusively in a horizontal position.

Benefits for installer and user

• Easy installation: Compact design and BSPP-G threaded connections (ISO 228-1) simplify and accelerate installation.

• Monitoring and diagnostics: Additional test points allow pressure differential measurement inside the valve, facilitating troubleshooting.

• Pressure reduction: Built-in pressure reducer protects the system from damage due to excessive pressure.

• Contamination protection: The valve effectively prevents backflow of contaminated water into the public water network, safeguarding user health.

• Durability and reliability: Materials used—bronze and brass—combined with the silicone seal ensure long-term, maintenance-free operation.

• Easy maintenance: Removable cover provides convenient access to internal valve components during servicing or repair.

Technical specifications

The connection length is 106 mm, which must be considered during system planning. The nominal diameter DN20 corresponds to the common 3/4 inch size, ensuring compatibility with most standard water supply systems. The net weight of the valve is 4 kg, a relevant factor for transportation and installation.