Safety valve 2115 G 3/4 inch 10 bar brass 2115.20.202

Pressure relief protection in closed systems

Safety valve 2115.20.202 is membrane‑operated and protects closed heating installations, especially domestic hot‑water heaters, from dangerous pressure rise. It is designed for use with water or other non‑adhesive liquids, at a maximum temperature of 110 °C — allowing use even in systems with a water‑glycol mixture, provided the glycol content does not exceed 50 %.

Construction and installation

The main housing is made of brass with high resistance to dezynkcyjność (DZR), ensuring durability in humid and aggressive water environments. The valve seat is steel — increasing wear resistance and enabling long‑term reliability without the need to replace the whole unit. Installation is performed using an internal G 3/4" thread, and the recommended position is vertical, with inlet from below — so the membrane operates correctly under pressure.

It requires no configuration or adjustment — it is factory‑set to 10 bar, matching typical requirements for medium and large hot‑water tanks. In case of failure or leaks on the outlet side, check whether the system pressure exceeds the design limit — a leaking valve is often a symptom of an installation error, not valve damage.

Compliance and operating conditions

The valve complies with DIN 1988 and AD‑Merkblatt A2 standards, and its design is certified TÜV‑SV‑05‑545‑DN‑W‑N‑p (SV-05-545-DN-W-N-, SV-05-545-DN-W-N-p). It is approved for water installations according to the UBA Positivliste. No additional documentation is required for acceptance by the UDT — simplifying installation and technical inspection.

Its purpose is clear: to protect the system from explosion or damage caused by over‑pressure. It is not a regulating element — only an emergency device. Therefore its proper operation depends on correct selection relative to tank volume or heating power — these data are provided in the manufacturer’s data sheet.