Kofloc Model 3000 Small Proportional Solenoid Valve

The Model 3000 Series maintains flow control characteristics with hysteresis of 15% or less (full-scale current).


The Model 3000 Series maintains flow control characteristics with hysteresis of 15% or less (full-scale current). This ultra-compact proportional solenoid valve is perfect for automatic gas flow control of gas chromatographs and various other analyzers. With its high resolution, the Model 3000 is also suitable for precision pressure control.




The natural environment is preserved through the balance of solids, liquids and gases that exist on the earth. However, human civilization has caused pollution that has greatly damaged our environment. The task of the present generation is to restore our environment to its natural healthy state. And this is also the greatest challenge for 21st century science and technology.

KOFLOC's corporate motto is "A Scientific Approach for Fluids." In other words, we create products that scientifically measure and control the balance of liquids and gases. We trust that through our work we are making a contribution to the regeneration of the environment and to the establishment of a prosperous society.


  • Ultra-compact, lightweight and high-performance proportional valve for a single power source
    Low power consumption (max. 2 W)
  • The annealed magnetic materials and specially designed flat spring completely prevent current fluctuations caused by vibrations due to plunger runout or friction.
  • The magnetic yoke is shaped by cutting, not bending, and annealed to eliminate interference in the magnetic flux passage and increase magnetic force.
  • Hysteresis not exceeding 15%, the lowest in the industry
  • Compliance with RoHS


Model 3000 Series
3010 * 1 3020 3030 3040 3050
Orifice diameter ( φ in mm) 0.08 0.28 0.5 0.75 1.3
Maximum CV 0.00022 0.0021 0.0086 0.02 0.042
Pressure Proof pressure 980kPa *2
Operating differential pressure Up to 0.98 MPa Up to 0.6 Mpa Up to 0.4 MPa
Control Maximum control voltage 24 VDC (PWM *3 control available) *5
Control voltage range 7–20 VDC (24 VDC)
Power consumption Max. 2W
Hysteresis 15% or less/full scale current
Filter 20 μ (IN/OUT) Without filter
Internal leak 0.1 ml/min or less within the proof
pressure range of the gas
0.2 ml/min or less
Operating temperature 0–50℃ *4
Storage temperature −5–70℃
Materials of parts in
contact with gas
BS C3604, SUS430F, FKM, SUS316, SUS304
SUS SUS430F, FKM, SUS316, SUS304
Dimensions (mm) □ 13 × 17.5 + φ 19 × 31
Lead wire UL3266 XLPE #28
Insulation Class A
Connection end φ 3.0 (standard)
Weight Approx. 60 g (The type with Rc 1/8: 140 g)

Additional Information

*1: This product is custom made only.
*2: The specifications show the proof pressure of the valve main unit. In the case of the hose nipple type, refer to the proof pressure of the hose.
*3: PWM: Pulse width modulation
*4: The temperature coefficient of the coil copper wire resistance is 0.004. The resistance is obtained by: Rt = R0°C (1 + 0.004 × t°C). When using voltage control, make sure that the ambient temperature does not vary widely. When the ambient temperature is likely to vary widely, we recommend current control.
*5: 12 VDC is also available as an optional specification for some models.

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