Low Flow back pressure regulators | PCS Precision Control Valves

Low Flow Series

Low Flow Series: Best-in-class pressure regulators

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.

Unique performance & broad flow range

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 10 different models: LF0/1/2 going up to 69 bar (1.000 psi), H3P0/1/2 going up to 206 bar (3.000 psi), H6P0/1/2 going up to 412 bar (6000 psi) and H10P going up to 689 bar (10.000 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.

Equilibar® Low Flow Series | Large flow range, all purpose research regulator

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
Available models*	LF0/1/2	H3P0/1/2	H6P0/1/2	H10P1
Maximum operating pressure	69 bar 1.000 PSI	200 bar 3.000 PSI	400 bar 6.000 PSI	680 bar 10.000 PSI
	*Customization possible; see also High Temp units
Flow coefficient (min-max Cv)* & turn down ratio	LF0 1E-08…0,01 1:1.000.000	H3P0 1E-08…0,01 1:1.000.000	H6P0 1E-08…0,01 1:1.000.000	–
	LF1/2 1E-08…0,07 1:7.000.000	H3P1/2 1E-08…0,07 1:7.000.000	H6P1/2 1E-08…0,07 1:7.000.000	H10P1 1E-06…0,07 1:70.000
Dead volume	LF0 0,23 mL 0,014 in3	H3P0 0,17 mL 0,010 in3	H6P0 0,17 mL 0,010 in3	–
	LF1 2,19 mL 0,134 in3	H3P1 2,08 mL 0,127 in3	H6P1 2,18 mL 0,133 in3	H10P1 1,28 mL 0,078 in3
	LF2 3,27 mL 0,200 in3	H3P2 3,48 mL 0,212 in3	H6P2 3,25 mL 0,198 in3	–
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 standard	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 Oxygen cleaning
	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