Kofloc Model 2203 Variable Secondary Pressure Flow Controller

A flow controller is a differential pressure regulator designed to control minute gas flows with precision and keep a certain constant flow rate.


A flow controller is a differential pressure regulator designed to control minute gas flows with precision and keep a certain constant flow rate. Model 2203 Variable Secondary Pressure Flow Controller is a control valve that keeps mass flows at a constant rate under a given constant level of supply pressure even when the load pressure on the secondary side (outlet side) fluctuates, and its construction is designed so that the performance of its precision control over flows to the set flow rate is maintained by the incorporated precision needle valve without being affected by such fluctuations.




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.


  • Stable flow control
    A non-rotary needle valve composed of high-precision components ensures smooth control of minute flows.
  • Not subject to load pressure fluctuations
    The incorporated precision needle valve protects flows from being affected by secondary or outlet pressure fluctuations, so the product is a ‘must-be’ tool in the first stage of any flow control line.
  • Cleanliness ensured
    All the components are super-cleaned before assembly so that the product can be safely used even on instruments for analysis for which cleanliness is essential.


  • Gas chromatographs
  • Environmental instrumentation systems
  • Gas mixing systems in various fields


Rated flow ranges Gas: 10 ML/min–20 L/min
Control accuracy Change in reading within 1.0% of change in load pressure
(Inlet-outlet pressure difference must be at least 0.05 MPa.)
Number of turns of
regulating screw
Approx. 12 turns
Maximum operating
0.8 MPa
Maximum operating
Materials of parts in
contact with fluids
(A) Al, brass, POM, NBR
(SS) SUS316, fluorocarbon resin, FKM
Connection end Rc 1/8 (M8 + Rc 1/8)

Optional Specifications

  • IN side filter joint Model 2300B
    • Connection joint

Additional Information

  • For information on available types of connection ends and filter joints other than those standard,please contact us.
  • You may specify the supply pressure,fluid and flow rate of your equipment for our selection of the type that most suits your requirements.
  • Use the values on Table of Rated Flow Ranges for reference purposes only.

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