Laboratory Products

High-pressure Gas Flow Control

Oct 17 2017 Read 339 Times

Vary-P control valves were already introduced by Bronkhorst in 1985 for controlling high-pressure gas flow with high pressure differences of up to 400 bar (later on extended to 700 bar). The control valves, usually integrated in a mass flow controller (F-230 series), are a more compact and much cheaper alternative to flow meters, which are combined with valves that are controlled pneumatically or using a servomotor. For controlling process pressure, Vary-P valves are often also applied in conjunction with Bronkhorst pressure meters. The Vary-P valve comprises a flow control section, along with a mechanism that keeps the differential pressure over this valve at a constant approx. 6 bar. As a result, the pressure at the inlet and outlet of the mass flow or pressure controller may vary without affecting the control performance.

For gas flow control up to 200 bar, Bronkhorst has recently developed a new, directly driven control valve; i.e. without a Vary-P mechanism. This development makes mass flow controllers fitted with this valve (F-220 series) even more compact, offering even faster control. Industrial versions (IP65 rating) of all mass flow controllers can also be supplied.

High-pressure mass flow controllers are often used to control gas flow in chemical processes, both in research and in production environments.

Read comments0

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.


Digital Edition

Lab Asia March / April 2018

April 2018

In this issue... Chromatography - Biphenylpropyl Modified Silica - New Application Book Offers Expertise in GPC Analysis - Same Separation, Speedier Solution - Advanced Laboratory Manageme...

View all digital editions

Events

ASMS Conference

Jun 03 2018 San Diego, CA, USA

Drug Discovery Summit

Jun 06 2018 Berlin, Germany

ACHEMA 2018

Jun 11 2018 Frankfurt, Germany

4th Global Endotoxin Testing Summit

Jun 12 2018 Annapolis, MD, & Pickering Beach DE, USA

View all events