Pressure relief controllers

AFA

AFA 2

AVA

AVA is a self-acting pressure relief controller primarily for use in district heating systems. The controller is normally closed and opens on rising pressure. The controller has a control valve, an actuator with one control diaphragm and a spring(s) for pressure setting.

AVPA

AVPA is a self-acting differential pressure relief controller primarily for use in district heating systems. The controller is normally closed and opens on rising differential pressure.

​​​​​​​The controller has a control valve, an actuator with one control diaphragm and handle for differential pressure setting.

VFG 2

VFG 21

VFG 22

VFG 221