The units in the Low Flow Series have also been known as “standard multi-orifice back pressure regulators”. A mouth ful, but also somewhat misleading, as there is nothing “standard” about these this subtype of the Equilibar Research Series. If anything, we consider these pressure valves as “The Standard” for research applications.
Yes, these pressure regulators are in fact commonly sold and broadly applied. The units in the Low Flow Series are based on Equilibar’s unique, patented multi-orifice technology and have an extremely wide flow range and superior (two-phase) flow performance. Because of their broad specifications, the LF units serve almost every research application you can think of!
The Low Flow regulators (or: standard multi-orifice regulators) in the Equilibar® Research series are most popular because they serve almost every research application. For instance, they can achieve stable pressure control in ultra low flow applications from subatmospheric pressure up to 690 bar (10.000 psi).
The Low Flow Series covers no less than 1o different models: LF0/1/2 and H3P0/1/2 going up to 69 bar (1000 PSI) and H6P0/1/3 and H10P going up to 206 bar (3000 PSI).
All these units have 4 inlet orifices, like most other Equilibar back pressure regulators. The outlet contains 2 orifices, making it more suitable for two-phase flow. These back pressure regulators can control stable pressure over a Cv range of 1:100.000 in open loop control. Temperature range (subject to material selection) is between -20°C and 650°C.
|Main specifications of Low Flow Series summarized
For complete overview, please see the product brochure, installation & maintenance guide and drawings via the tabs on the left side of this table.
Contact us if you cannot find what you are looking for!
|Often used in||Processes with low flows, use in laboratory and laboratory scale applications
Works well with gas, liquids and mixed-phase media
|Maximum operating pressure||69 bar |
|200 bar |
|400 bar |
|*Customization possible; see also High Temp units|
|Flow coefficient |
& turn down ratio
|MAOT in °C||≤ 40°C for polymer bodies
≤ 150°C for metal bodies + PTFE diaphragm + Viton® O-rings
≤ to 200°C for metal bodies + metal diaphragm + Viton® O-rings
≤ 300°C for metal bodies + metal diaphragm + Kalrez® O-rings
For High Temperature models ≤ 450°C see High Temperature Series
|Port sizes||LF0 | H3P0 | H6P0: 1/16″ NPT or BSPP|
|LF1 | H3P1 | H6P1 | H10P1: 1/8″ NPT or BSPP|
|LF2 | H3P2 | H6P2: 1/4″ NPT or BSPP|
|Port thread options||HiP, Swagelok VCO/VCR®, Tube Stub,HPLC, Autoclave Speed-Bite|
|Body & cap material|
|Stainless Steel 316/316L|
|Body & cap material options||Hastelloy C276, Titanium, Zirconium
PTFE, PVDF, PEEK, PVC, Monel
|Diaphragm materials||PGL (PTFE Glass Laminated), Stainless Steel SS316/316L, Hastelloy C276,
Virgin PTFE, FKM, Polyimide, Buna‐N, PEEK, EPDM
*Diaphragm thickness will be selected by our engineers based on your process parameters
|O-ring materials||Viton® (FKM), Kalrez® (FFKM), PTFE, EPDM, Buna‐N|
|Options||Can be supplied including mounting brackets
|Spare part kits and/or Rebuild kits optionally available
See: Spare Parts and Maintenance
|Electronic & manual pilot control options available
See: How to pilot your back pressure regulator