Sanitary Back Pressure Regulators | Control | Equilibar

Sanitary Back Pressure Regulators

Equilibar Hygienic Back Pressure Regulators

Equilibar is proud to offer sanitary back pressure regulators (BPRs) with hygienic features for BioPharma and sanitary industrial applications. The Equilibar® FD Series BPR is designed with ASME BPE in mind, and the Equilibar® SD Series BPR is a single use design to accommodate the rapidly expanding requirements of the BioPharma industry.

Both valve series feature the same dome-loaded multiple orifice technology as all Equilibar patented products, delivering instantaneous control, frictionless operation, superior precision, and exceptionally wide flow rate ranges. They offer advantages for sanitary fluid control applications in consumer products and biopharmaceutical production.


Traditional back pressure regulators use springs to gradually open up as the overpressure is used to compress the spring. This often results in significant inlet pressure loss with increases in process flow. Equilibar® sanitary back pressure regulators feature ultra-sensitive diaphragm-operated back pressure technology capable of controlling pressure with high precision over a wide range of flows. They fully open in less than 1% overpressure in most applications. The stability of the Equilibar regulator is unmatched in the industry.

The graph to the right shows an example of the consistent performance of a 3/4” sanitary FD regulator with water.


With only one moving part, FD sanitary regulators are easy to disassemble for maintenance, reassemble, and return to use quickly and easily. The compact design facilitates a simple process layout.


The FD Series sanitary valve bodies are made of SS316L standard steel and contain USP Class VI diaphragms. The design is compatible with temperatures up to 135°C experienced during steam sterilization and the wide working flow range allows one FD size to effectively control during high flow CIP rates as well as very low flow dosing rates. These sanitary units have undergone comprehensive design and testing to have optimum drainability when oriented with the inlet down.


Equilibar FD sanitary back pressure regulators respond instantaneously to changes in flow or setpoint to maintain the desired inlet pressure. Because of its capacity to control within milliseconds, the FD Series is a perfect match for computer automated control. Paired with an electronic pilot regulator, the FD regulator may be connected to the process control system, and it is ready for automation.


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Product Summary

Max Pressure
Cv Range
Body Materials


1/2″ 150 psig / 10 bar(g) 1E-7 to 1.0 SS316L; Hastelloy C; custom


3/4″ 150 psig / 10 bar(g) 1E-5 to 4.0 SS316L; Hastelloy C; custom


1″ 150 psig / 10 bar(g)  1E-5 to 8.0 SS316L; Hastelloy C; custom


1.5″ 150 psig / 10 bar(g)  1E-4 to 12 SS316L; Hastelloy C; custom


2″ 150 psig / 10 bar(g) 1E-3 to 19 SS316L; Hastelloy C; custom

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Application Spotlight – Liquid Blending

One common application for the Equilibar FD Series is liquid product blending or dosing. Many manufacturers of personal care products need to precisely control the amount of perfume, dye, or active ingredient that is injected into a line. Performance of positive displacement pumps can be improved, especially in low viscosity applications, by the addition of a precision back pressure regulator.

An FD Series back pressure regulator, with its unique multiple orifice design, is capable of controlling pressure at extremely low flow rates, allowing a more exact mixture of ingredients during blending. Additionally, the Equilibar FD regulator acts as an isolator to header pressure fluctuations as blended product flows through the header. This keeps downstream fluctuations from adversely impacting upstream flow control equipment.

Contact an application engineer to help select one of our sanitary back pressure regulators for your application.

Learn more about our back pressure regulator  technology and how it works.

Equilibar FDO6 sanitary back pressure regulator with Model 10 pilot regulator

The 3/4″ FDO6 shown with the Model 10 manual pilot regulator


Performance Graph of FDO6 Sanitary Back Pressure Regulator with Water


Performance of FDO6 3/4″ BPR with Water

Equilibar FDO4 Hygienic Sanitary Back Pressure Regulator

Equilibar® FDO8 1″ sanitary back pressure regulator with standard Tri-Clamp fittings.
Sanitary FDO6 with QPV pilot regulator
equilibar 3/4″ FDO6 with electronic QPV pilot regulator for automation

Equilibar EB8FD16 Hygienic Sanitary Back Pressure Regulator

2″ FDO16 sanitary back pressure regulator shown with optional tube stubs fittings for welding at customer site.
Sanitary Back Pressure Regulators
Equilibar® FDO4 back pressure regulator has a slightly different body design from other models
schematic showing the Equilibar back pressure regulator with a metering pump<br /><br /> and positive displacement pump in a liquid product blending application



Equilibar News

March 2019 Flow Control Magazine

Equilibar is featured in Flow Control Magazine

Equilibar is featured in the March issue of Flow Control Magazine in an article explaining how direct sealing diaphragm valves offer good solutions for extremely difficult flow control scenarios. The article includes two case studies—one from ILS-Integrated Laboratory Solutions, GmBH in Berlin and the other from Pressure Control Solutions (PCS) in the Netherlands. I feel Read More

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