VVI41. and VXI41. series valves are internally threaded two-way/three-way seat valves that can be used in HVAC systems as control or safety shut-off valves in accordance with DIN32730 standard.
This manual provides an overview of the Siemens VVI41 and VXI41 two‑way/three‑way seat valves, including their construction, material, and applicable standards. It lists the nominal diameters, flow rates, pressure ratings and operating temperature ranges for each model.
Detailed installation instructions cover recommended pipe placement, actuator selection, heating element requirements for sub‑zero temperatures, and safety procedures for commissioning and maintenance. Dimensions, weights and connection details are also included. This manual is written in Chinese.
| Nominal diameter (DN) | DN15‑DN50 |
|---|---|
| Flow rate (kvs) | 2.5 – 40 m³/h |
| Pressure rating | PN16 |
| Valve body material | Bronze CC491K (Rg5) |
| Operating temperature range | -25 °C – +140 °C |
| Maximum working pressure | 1600 kPa (16 bar) |
| Stroke | 20 mm |
It is recommended to install the valve on the return pipe of the heating system, where the temperature is lower, to extend the seal material’s life.