Blog

Category: Pressure control applications

  • Inflating single-use bioreactor bags using dual-valve pressure controllers

    Inflating single-use bioreactor bags using dual-valve pressure controllers Background: installing & inflating single-use vessels Single-use bioreactors (SUBs) offer key advantages including increased sterility and subsequently simpler and faster changeover between batches or campaigns. After the product is removed from the bioreactor, the single-use bioreactor bag can simply be removed from its holding container and disposed […]

  • Absolute pressure control equates to absolute temperature control for cryogens

    Absolute pressure control enables direction of cryogen pressure and ensures precise temperature Cryogens are loosely defined as substances which liquefy at or below 120 K under standard pressure (760 Torr). Cryogens are used for applications including cryopreservation, rocket propulsion, and medical imaging – all of which require liquefied substances at extremely cold temperatures. Absolute pressure […]

  • Regulating vacuum in test system when the vacuum source varies

    Regulating vacuum when the vacuum source varies The efficiency of any vacuum process depends greatly on the stability of the vacuum that is maintained in the chamber. Examples of this abound, including ensuring a clean diamond with the desired internal structure in artificial diamond manufacturing and or carbon nano tube generation, where a stable vacuum […]

  • Using pressure control to overcome the challenges of high-speed aerodynamic tests

    Overcoming the challenges of high-speed aerodynamic tests In aerospace development and testing, aerodynamicists frequently occasions need to pressurize large volumes to high pressures: often volumes of greater than 100 L, pressurized to over 150 PSIG. These aerodynamic tests generally require high flow rates in addition to high pressures. However, there can be limits on the […]

  • Achieving more repeatable vacuum coatings with faster, higher precision pressure control

    Achieving more repeatable vacuum coatings with faster, higher precision pressure control Process control engineers who work in vacuum coating design environments in which they can create a vacuum (any area with pressures below atmospheric pressure) in a sealed chamber. In order to precisely control a reaction between process substances, any atmospheric gases must be removed […]

  • Upstream pressure control increases stability and speed for vacuum deposition

    Placing pressure control devices upstream of the chamber in vacuum coating applications saves time, cost, and increases accuracy in vacuum deposition tools.

  • Using a dual valve pressure controller and the Venturi effect to create a vacuum

    Recently we worked with a customer that needed to control the pressure in a reaction chamber between -200 to +200 cmH2O. However, though the customer’s building had an ample supply of compressed air, they had no vacuum source. Without suction, they were unable to reach negative gauge pressures. We went to work finding a solution […]

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    External ion gauge vacuum control system

    External ion gauge vacuum control system Research projects involving isolated chambers with decomposing organic components often use rotometers. The external ion gauge vacuum control system uses a special configuration of the Alicat single valve pressure controller. Alicat’s External Ion Gauge Vacuum Controller was designed specifically for the vacuum coating industry. This innovation circumvents the low […]

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    Pressure control with sense port

    Pressure control with remote sense line An Alicat Dual Valve Pressure Controller with External Pressure Port (PCD3-100PSIG-D) is used to control the process pressure in a closed chamber. Because the flow rate into the chamber can be quite high, a significant flow induced pressure drop may occur in the process line. If an internal pressure […]

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    Fluid dispensing using pressure control

    Fluid dispensing using pressure control In silicon wafer polishing systems (and often in biotech processes), head pressure in a liquid chamber is used to deliver fluid from the chamber into the application. To ensure accurate delivery, the headspace pressure must be incredibly precise. Nitrogen, vented to atmosphere through an exhaust valve, is the most common […]