How it works - Precision pressure control

Equilibar ® dome-loaded precision back pressure regulators operate by using a diaphragm that acts as a seal. A reference pressure is set on the diaphragm, which pushes the diaphragm down to close the orifices. As long as the set pressure is higher than the inlet pressure, it remains sealed. When the pressure at the inlet exceeds the pressure set at the reference, the seating forces are overwhelmed and the diaphragm will lift to relieve pressure. The relieved pressure is just enough to maintain the pressure set at the dome in a tight equilibrium with the inlet pressure. This results in an incredibly fast response as well as high precision in maintaining the process pressure at the required level.

Unique pressure control features

Equilibar dome-loaded back pressure regulators offer high precision and repeatability/reproducibility.

These precision back pressure regulators maintain the upstream pressure at their own inlet. They use patented technology to enable high precision and stability for controlling the pressure of your process. The regulators are particularly suitable for extreme temperatures, mixed phase fluids, corrosive media and sanitary applications. Depending on process conditions, a wide range of materials is available for the body and the diaphragm, such as, but not limited to (glass reinforced) PTFE, stainless steel 316, Hastelloy, zirconium for the diaphragm and the same materials along with other polymeric materials for the body. Because of this, the performance of the Equilibar back pressure regulator is unparalleled in the industry!

The back pressure regulator typically holds its upstream pressure within 0,2% to 0,5% of the applied reference. Setting a stable reference pressure is key to get the most out of the performance of your back pressure regulator and thus the best performance of your process.

Applicable for demanding and even unknown process conditions

In practice, the conditions under which future processes will operate are often unknown when preparing to build such an application. Equilibar ® back pressure regulators can be operated with broad variations in design specifications and therefore enable a wide variety of process parameters.

Visit our products overview page on back pressure regulators to read more about the outstanding performance of our products compared to traditional devices and visit our applications page to learn more about the wide range of applications in which our products are being used.

Manual or electronic pressure control

There are different methods on how to supply the reference pressure to your dome-loaded back pressure regulator. First, it is good to know that the compressibility of the media that you use in the reference helps to get good performance. The most common methods are therefore based on applying a gas as a pilot media. In some applications, liquids can be used.

The precision of the Equilibar back pressure regulator is furthermore defined by the accuracy of the reference set-point on the dome. The reference set-point pressure can be applied by means of a manual forward pressure reducing regulator or an electronic pressure controller (single valve or dual valve). Electronic regulators provide the most flexibility and the most accurate result.

In sophisticated pilot plant and R&D processes where maximum performance, stability, accuracy, and reproducibility are required, we recommend closed loop control between the actual process pressure and the reference pressure. Contact us for more information on closed-loop control.

In the video above we demonstrate using a (manual) forward pressure reducing regulator to set the pressure. This is connected to the reference port of the back pressure regulator and sets the required pressure on the dome of the back pressure regulator. The explanation for this can be seen from 0:33 to 0:43.

Below you can browse our product categories, where you will find more in-depth information about the various types of back pressure regulators that we offer. Feel free to contact us for a quotation or trial delivery and convince yourself. We will help you configure the optimal product solution for your process requirements and pressure challenge!


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About us

Pressure Control Solutions B.V. is centrally located in Veenendaal, the Netherlands, since 2016. Pressure Control Solutions was founded by Armand Bergsma, who then had over 16 years experience with Bronkhorst High-Tech and thus knows all about measurement and control of mass flow, pressure and vapor applications. By now, PCS has grown to a team of 7 (and counting), including solid representation in Germany for our rapidly growing customer base in Germany and surrounding German speaking countries.

Our Products & Expertise

We supply our customers with precision pressure control products, specifically selected for their specific process requirements. In addition to precision pressure control (back pressure & forward pressure), Pressure Control Solutions has a solid track record and growing focus on other process parameters, such as flow or level.

Our products often come from carefully selected suppliers, or have been engineered and assembled in-house. All with a relentless focus on your particular process conditions and relevant products that are uniquely capable of fulfilling the most demanding application requirements. With our products and expertise, we allow users to push their process to its limits: Greater control dynamics, higher pressure, higher temperatures and the use of exotic materials are part of the standard package at PCS.

Do you need anything else? We can help!

The products and applications showcased on this website provide you with a good overview of what we can do. Products like the Equilibar back pressure regulators combined with sophisticated electronic pressure controllers are a good example of  our high-value solutions.  If your application or processs challenge is not listed on our website, please contact us to explore how we can help you!


Where we work

Pressure Control Solutions is the authorized distributor for Equilibar®, LLC (US) products in Western Europe. We are happy to address any enquiries for Equilibar products from customers in Germany, The Netherlands, Norway, Sweden, Finland, Denmark, Flemish Belgium, Austria and the German part of Switzerland. Products of our own development – such as several electronic pressure controllers – are available also to customers outside this territory.

PCS Team June 2020 with logo