Self-acting back pressure regulators are simple control valves offering accurate control while being easy to install and maintain. They control the pressure upstream of the valve without requiring pneumatic or electrical control elements.
The UV 1.6 and UV 2.6 backpressure regulators are medium-controlled weighted-lever valves for medium to large volumes. These valves require no auxiliary energy. Thanks to their integral control characteristics they are very accurate. The time reponse is set by means of an oil-filled damper.
When the pipeline is depressurised the valve cone is kept in closed position by the weighted lever. As the inlet pressure rises a control piston is pressurised via a pilot line, lifting the lever and moving the valve cone towards the "open" position. During normal operation the closing force of the weight and the opening force of the piston balance each other and the backpressure regulator operates continually. The inlet pressure is kept constant irrespective of outlet pressure and flow volume. The control pressure is set by changing the weight on the lever.
The maximum inlet pressure must not exceed 1.5 times the maximum set pressure, unless specified otherwise.
In the case of toxic or hazardous media a leakage line must be installed to the control unit capable of draining leaking medium safely and without pressure if the control element should become defective.
The valves requires a sense line (to be installed on-site).
These valves are no shut-off elements ensuring a tight closing of the valve. In accordance with DIN EN 60534-4 and/or ANSI FCI 70-2 they may feature a leakage rate in closed position in compliance with the leakage classes II – V: