Constant flow regulator with alarm model 3631

Flow range H₂O, +70°F:
min 0.2 – 1.3 USGPH
max 4 – 26 USGPH

Flow range air, 14.7 psia, +70°F:
min 1.5 – 6 SCFH
max 20 – 120 SCFH

Typical applications:
water purging for instruments
air purging in level measurements
gas purging in Δp measurements

Metric units Imperial units

Technical data

Model	3631
Max. flow	24 USGPH H₂O, 2.3 SCFM at 87 psig air 1.5 L/min H₂O, 60 NL/min at 6 bar(g) air
Max. pressure difference	145 psi (10 bar)
Max. static pressure	290 psi (20 bar)
Min. pressure difference	29 psi (2 bar)
Connections	G 1/4″ or NPT 1/4″
Max. temperature	167°F (75°C) / 176°F (80°C)
Weight	1.3 lbs (0.6 kg) aluminium body, 2.6 lbs (1.2 kg) AISI 316 body
Body	Aluminium or stainless steel AISI 316
Spring	Stainless steel AISI 316
Membrane	EPDM
Membrane plate	Nylon (PA 6) (*PVDF)
Seals	Nitrile (*Viton®, EPDM)
Mesh	PTFE
Alarm sensor	NAMUR or PNP/NPN (2-wire)
*) Special construction on request

Kytola's constant flow regulator model 3631 is an excellent choice for the following applications