The performance curve below demonstrates what is most unique about the Equilibar® back pressure regulator. The chart shows virtually flat-line pressure stability across over 6 orders of flow rate magnitude. By using several different diaphragms, the same regulator body can also be used to control pressures from less than 0.1 psig / .006 bar(g) to above 1000 psig / 68.9 bar(g). Controls down to extremely low flow rates.
Performance curves can vary according to port size and diaphragm selection.
1/8″ Research Series EB1LF1 performance curve
See Equilibar precision in action:
- Overview of back pressure regulator technology
- Contact our engineers to have a regulator specifically sized for your application.
Precision for Larger Back Pressure Regulators
The precision of larger back pressure regulators is theoretically the same as with smaller Research units, as described above. However, in practice, larger BPRs are typically sized to achieve a good balance between needed precision and economical body sizing. For example, a 3/4″ BPR might provide a pressure build of 5% at full water flow capacity, whereas a 1″ BPR might have precision in the 2% range. Depending on the accuracy requirements and the user’s budget, your application engineer can help you size a model to meet all your requirements.
Precision at Different Pressure Ranges
Theoretically, it is possible to achieve the same % precision at low pressure set-points as it is with high pressure set-points. However, in practice, this is rarely achieved. In order to achieve excellent precision at lower differential pressures, it is necessary to over-size the unit such that the friction from fluid moving through the passages is small relative to the available pressure differential. In ultra-low pressure application, this is rarely achieved due to the economics of supply very large regulators.
