Kofloc Model 2203 Variable Secondary Pressure Flow Controller

The Kofloc Model 2203 Variable Secondary Pressure Flow Controller is a precision instrument designed to maintain a constant gas flow rate even when the secondary (outlet) pressure fluctuates.

Description

The Kofloc Model 2203 Variable Secondary Pressure Flow Controller serves as an essential tool for engineers who face the challenge of unstable backpressure. In many chemical and analytical processes, the resistance at the outlet can change—whether due to a rising liquid level in a bubbling tank or a fluctuating pressure inside a reaction chamber. The Model 2203 automatically compensates for these changes to prevent flow drift.

This mechanical controller functions by maintaining a constant differential pressure across its internal needle valve. When the secondary pressure increases or decreases, the internal diaphragm of the Kofloc Model 2203 Variable Secondary Pressure Flow Controller instantly reacts to adjust the internal valve balance. This results in a stable mass flow that is independent of outlet pressure variations. Its pure mechanical operation means it requires no electrical power, providing a fail-safe and explosion-proof solution for sensitive industrial and laboratory environments.

Brand

Kofloc

Kofloc

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.

Specification

  • Model: 2203

  • Control Method: Secondary pressure (backpressure) compensation

  • Applicable Fluids: Air, Nitrogen (N2), Oxygen (O2), Argon (Ar), and other non-corrosive gases

  • Flow Ranges: Available from 10 sccm up to 20 L/min (gas dependent)

  • Maximum Operating Pressure: 0.7 MPa (standard)

  • Pressure Compensation Range: Maintains flow within ±2% even with a 0.1 MPa change in outlet pressure.

  • Operating Temperature: 5°C to 60°C

  • Connection Ports: Rc 1/4 or 1/4″ compression fittings

  • Wetted Materials: SUS316, Brass, and Fluorocarbon rubber (Viton)

Features

  • Automatic compensation for secondary (outlet/backpressure) fluctuations.

  • Maintains precise flow rates without the need for electronic control or power.

  • High-performance needle valve for ultra-fine flow adjustments.

  • Highly durable diaphragm design ensuring rapid response to pressure shifts.

  • Available in multiple material grades including Stainless Steel for high-purity applications.

  • Compact, panel-mountable form factor for streamlined system integration.

Applications

  • Gas Bubbling Systems: Maintaining a constant gas feed as liquid levels change.

  • Chemical Reactors: Ensuring steady reagent gas flow into pressurized vessels.

  • Burner Systems: Preventing flame instability caused by backpressure changes in the nozzle.

  • Aeration Processes: Precise air delivery in biological or chemical treatment tanks.

  • Analytical Instrumentation: Providing stable flow for sensors that operate under varying exhaust pressures.

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.