Safety pressure controllers
Safety pressure controllers
Self-acting, medium-operated proportional controller, which through automatic opening of the valve prevents exceeding pressure before the valve (SAVA) and behind the valve (SAVD). The actuator features two diaphragms, which enable the valve to open in case of a defect at the control diaphragm. The controller is mainly used in district heating systems.
Function of the SAVA controller: the high upstream pressure in front of the valve is led to the lower part (high pressure connection) of the diaphragm inside the controller. Through a channel in the controller, the medium pressure is led from the valve to the upper side (low pressure connection) of the diaphragm.
The spring power of the control valve now affects the diaphragm, thus determining the effective differential pressure.
Function of the SAVD controller: the valve outlet pressure of the valve is led to the lower part (high pressure connection) of the diaphragm inside the controller. The upper side (low pressure connection) of the diaphragm is connected to the atmosphere. The spring power of the control valve now affects the diaphragm, thus determining the closing pressure.
Product Highlights
- Eliminates pressure variations and provide optimum operating conditions with improved temperature control quality
- Made for demanding systems, resistant to corrosion, cavitation and dirt
- Connected system is protected against pressure surges, fluctuations, cavitation and noise
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Benefits of differential pressure and flow controllers in DH or cooling systems (constant flow)
Product types shown: 4
AVDA
AVDA is self-acting differential pressure relief controller used for constant flow control or bypass control. Controller opens on rising differential pressure. The controller has a control valve, an actuator with one control diaphragm and handle for differential pressure setting. For apartment block heating, district heating plant and central heating systems.
SAF
The controller is a self acting, medium-operated proportional controller which prevents exceeding pressure before the valve by automatic opening.The actuator features 2 diaphragms which enable the valve to open in case of a defect at the control diaphragm. This controller is mainly used in district heating systems.Design-tested according to DIN 4747 (SÜV) and the AGFW guidelines.
SAVA
SAVA is a self-acting safety pressure relief controller primarily for use in district heating systems.
The controller is normally closed and opens on rising pressure. It is used for pressure relief control and as a protection against excess pressure in front of the valve.
The controller has a control valve, an actuator with two control diaphragms and a spring(s) for pressure setting.
Design-tested according to DIN 4747-1 and AGFW - FW 506.
SAVD
SAVD is a self-acting safety pressure reduction controller primarily for use in district heating systems. The controller is normally opened and closes on rising pressure. It is used for pressure reduction control and as a protection against excess pressure behind the valve.
The controller has a control valve, an actuator with two control diaphragms and a spring(s) for pressure setting.
Design-tested according to DIN EN 4747-1 and AGFW guidelines FW 504.