---
title: VAL (operating principle)
description: "![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_wasser.png) Selection of the operating principle of the valve drive used **NC** normally closed (default) **NO** normally open"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-thermostat-55-matrix/val-operating-principle/"
updated: "2026-09-30"
category: Alpha direct thermostat 55 Matrix
---

# VAL (operating principle)

![](https://faqdoc.info/wp-content/uploads/2026/01/Matrix_55__Icon_wasser.png)

Selection of the operating principle of the valve drive used

**NC**
normally closed (default)

**NO**
normally open