AFPA is a self-acting differential pressure relief controller primarily for use in district heating systems. The
controller opens on rising differential pressure.
Features and benefits
The controller has a control valve (flange connection), an actuator with control diaphragm and a spring for differential pressure setting.
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- Bypass valve are to be selected on the required bypass flow rate and opening pressure loss
- The valves shall be capable of the required opening pressure within the published spring range
- The valves shall be installed with a partner valve to enable bypass flow measurement and flow limiting if necessary
- The partner valves shall be fixed orifice in DN15-50 and variable orifice in DN50 (high flow) to DN400