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 biopharmaceutical and sanitary industrial applications. The Equilibar® FD Series BPRs are machined from stainless steel or Hastelloy and are suitable for applications such as personal care products, food and beverage and pharmaceutical manufacturing.

The Equilibar® SD Series BPRs are a single use design to accommodate the rapidly expanding requirements of the biopharmaceutical industry. The disposable SD body and diaphragms are made from USP Class VI polymers and are inserted into a permanent stainless steel support housing with wing nut closure for quick and easy assembly.

Both valve series feature Equilibar’s patented dome-loaded multiple orifice technology delivering instantaneous control, frictionless operation, superior precision, and exceptionally wide flow rate range . They offer advantages for sanitary fluid control applications in consumer products and biopharmaceutical production such as gradient chromatography, tangential flow filtration, and liquid dosing.

Canadian Registration Number (CRN) certification available on some models for all territories and provinces. Please contact us for more information.


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 an FDO6 3/4” sanitary FD regulator controlling water pressure across a wide range of flow.


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 demonstrates how the FDO8 can keep precise pressure control across a wide range of flow rates from 30 ml/min to 100,000 ml/min. 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.

Sanitary pressure and flow control valves from Equilibar

FD Series BPRs come in a variety of sizes for hygienic applications large and small.

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Performance Graph of FDO6 Sanitary Valves Back Pressure Regulator with Water
Performance of FDO6 3/4″ BPR with Water

photo of FDO6 sanitary back pressure regulator

Video showing precise pressure control using an FDO8 valve across a wide flow range

Sanitary valves FDO6 with QPV pilot regulator
Equilibar 3/4″ FDO6 with electronic QPV pilot regulator for automation
Sanitary Back Pressure Regulators

Equilibar® FDO4 has a slightly different body design from other models

Equilibar FDO4 Hygienic Sanitary Back Pressure Regulator

Equilibar® FDO8 1″ sanitary back pressure regulator with standard Tri-Clamp fittings.

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 News
flow control june 2020

Flow Control Magazine features oil well injection using Equilibar valves to improve performance

An exciting case study featuring oil well injection in the Bakken Basin of North Dakota was published in the June 2020 issue of Flow Control Magazine.  Co-authored by Diane Jacober of Equilibar and Christopher Duffield of Intermountain Electronics , the article explains how direct-sealing diaphragm valves offer practical advantages for difficult flow control applications, especially Read More

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