Ultra low flow: Pressure regulator suitable for extremely little flows
These units complement the commonly used Low Flow Series, but use a slight bit more flow than zero in which case the Zero Flow Series is better suited. This makes it suitable for process control in situations with extremely little flow in the process. Ultra Low Flow (ULF) pressure regulators can be applied in processes operating with pressures ranging from subatmospheric pressure up to 690 bar (10.000 PSI)!
The ULF series of ultra low flow pressure regulators offer 3 different units with their own pressure ratings for optimal configuration: U3L units up to 206 bar gauge (3000 PSI), U6L units up to 412 barg (6000 PSI) and U10L units that can withstand 690 barg (10.000 PSI).
Ultra low flow back pressure regulators
This Ultra Low Flow back pressure regulator is made of stainless steel, and it has got a slightly conical-shaped edge. The diaphragm shields directly on the conical-shaped orifice. Applying pressure to the regulator results in an ultra-low flow performance.
Ultra Low Flow back pressure regulators
The Equilibar ยฎ ULF (Ultra Low Flow) series can achieve stable pressure control in applications handling an ultra-low flow of process media. In addition, the units can be used from subatmospheric pressure up to 690 bar (10.000 PSI). The ULF series is positioned to in the Equilibar product portfolio between the Low Flow series (also called standard multi-orifice series)ย and theย Zero Flow series.
These ULF control valves are based on Equilibarโs multi-orifice design. It has 4 inlet orifices, just like all other Research Seriesย back pressure regulators. The difference between the ULF regulator and theย standard Low Flow Series is that the ULF units has only one single outlet orifice. The single outlet orifice reduces the Cv value, therefore achieving an excellent ultra-low-flow performance. The diaphragm slightly deforms over the orifice, resulting in low flow. Proper setting of the diaphragm optimizes the sealing capacities and low flow performance.
Rebuilding ULF units into ZF units
If your application requires the regulating of pressure with zero flow, you might want to select the ZF series. What is special about the ULF models is that users can choose to convert the ULF regulator into a ZF regulator with only 2 spare parts, if your application or experiments would require it. It takes only a few minutes to rebuild the unit and it doesnโt take any tuning (see videos!).
Equilibarยฎ Ultra Low Flow Series | Large pressure range for very small flows
Main specifications of Ultra 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.
Research applications such as pore pressure transmission, very low flow catalysis, Fischer-Tropsch synthesis and research-scale reactor pressure control
Available models*
U3L(0/1/2)
U6L(0/1/2)
U10L(0/1)
*Customization possible; for example U20L unit or High Temp units
Maximum operating pressure
U3L(0/1/2)
200 bar
3.000 PSI
U6L(0/1/2)
400 bar
6.000 PSI
U10L(0/1)
680 bar
10.000 PSI
Flow coefficient
(min-max)
& turndown ratio
U3L0
1E-09…0,01
1:10.000.000
U6L0
1E-09…0,01
1:10.000.000
U10L0
1E-06…0,01
1:10.000
U3L1
1E-09…0,05
1:50.000.000
U6L1
1E-09…0,05
1:50.000.000
U10L1
1E-06…0,05
1:50.000
U3L2
1E-09…0,05
1:50.000.000
U6L2
1E-09…0,05
1:50.000.000
–
Dead volume
U3L0 & U6L0
0,25 mL (0,015 in3)
–
U3L1
2,16 mL (0,132 in3)
U6L1 & U6L2
2,28 mL (0,139 in3)
U10L1
1,33 mL (0,018 in3)
U3L2 & U10L0
3,34 mL (0,204 in3)
–
MAOT in ยฐC
โค 40ยฐC for polymer bodies
โค 150ยฐC for metal bodies + PTFE diaphragm + Vitonยฎ O-rings
โค to 200ยฐC for metal bodies + metal diaphragm + Vitonยฎ O-rings
โค 300ยฐC for metal bodies + metal diaphragm + Kalrezยฎ O-rings
PGL (PTFE Glass Laminated), Stainless Steel SS316/316L, Hastelloy C276,
Virgin PTFE, FKM, Polyimide, BunaโN, PEEK, EPDM
*Diaphragm thickness will be selected by our engineers based on your process parameters
