Back Pressure Regulators Back Pressure Regulator - UV 3.9 | Mankenberg Back Pressure Regulator - UV 3.9 | Mankenberg The Back Pressure Regulator - UV 3.9 by Mankenberg is a precision device designed to maintain a consistent upstream pressure by releasing excess pressure downstream. It is typically used in various industrial applications to ensure stable system pressure, protect equipment, and optimize process performance. The UV 3.9 model is known for its reliability,... View Flanged PN 1 PN 2.5 DIN 1.4404