Sanitary Valves | Control | Equilibar

Equilibar Sanitary Valves

Equilibar Hygienic Back Pressure Regulators

Equilibar is proud to offer sanitary valves and back pressure regulators (BPRs) with hygienic features for BioPharma and sanitary industrial applications. The Equilibar® FD Series BPRs are machined from stainless steel or Hastelloy and the Equilibar® SD Series BPRs are 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 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 valves are made of SS316L stainless steel and contain USP Class VI diaphragms. The design is compatible with temperatures up to 135°C experienced during steam sterilization, and the valve’s wide working flow range allows one FD size to effectively control during high flow CIP rates as well as very low flow dosing rates. The video at the right shows how the FDO6 can keep precise pressure control across a wide range of flow rates. These sanitary valves 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-4 to 4.0 SS316L; Hastelloy C; custom


1″ 150 psig / 10 bar(g)  1E-4 to 8.0 SS316L; Hastelloy C; custom


1.5″ 150 psig / 10 bar(g)  1E-3 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 – Biopharmaceutical filtration

The Equilibar® dome-loaded back pressure regulator (BPR) offers higher turndown ratio than other valves and can therefore provide precise control across a wide range of flow rates. This makes the Equilibar BPR a superior choice in traditional trans flow or cross flow filtration control.

Schematic of Cross Flow Filtration using Equilibar Sanitary back pressure regulator

In the schematic above, an Equilibar FD BPR is used in both the retentate and permeate lines at the exit of the trans flow filtration membrane. A setpoint is established on the dome of the BPR using an electro-pneumatic pilot regulator for computer automation. This allows the filtration system to be controlled using differential pressure (dP) mode – the pressure differential between the feed and retentate streams or by transmembrane pressure (TMP) mode – adjusts the retentate control valve to maintain constant TMP. Read more here.

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


Video showing precision pressure control using an FDO6 valve across a wide flow range

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.

Equilibar FDO4 Hygienic Sanitary Back Pressure Regulator

Equilibar® FDO8 1″ sanitary back pressure regulator with standard Tri-Clamp fittings.
Sanitary Back Pressure Regulators
Equilibar® FDO4 back pressure regulator has a slightly different body design from other models



Equilibar News

dome loaded regulators in water technology

Equilibar’s Jeff Jennings shares his expertise on dome loaded regulators in Water Technology Magazine

The May/June issue of Water Technology Magazine features a six-page article by Equilibar founder Jeff Jennings that provides an overview of dome loaded regulators. The article compares dome-loaded technology to traditional spring-loaded technology. It also explains the differences between a pressure reducing regulator and a back pressure regulator. “Over the years we’ve learned that there Read More

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