Flow Control Valves

A needle valve is the typical flow control valve that controls the flow rate based on the change of resistance of the flow channel using an acicular or rod-shaped needle to adjust the opening of the flow channel that functions as a small orifice. KOFLOC offers simple-type, precision-type and various other needle valves, and also manufactures flow controllers having a combination of a needle valve and diaphragm as well as proportional solenoid valves that electrically control the flow rate.

Precision Needle Valve w/Non-rotary Needle MODEL 2412 SERIES. This needle valve has been designed to control minute gas and liquid flows with precision and ease. Design allows the rotation of the regulating screw to transform into linear motion of the needle without subjecting the needle to gaps and/or vibrations produced by the screw, so smooth, stable flows can be ensured.

■Fluid：
Gas　N₂,Air,H₂,He,Ar,O₂,CO₂ etc.
Liquid　H₂O
■Flow range：
Gas　5mL/min～100L/min(Air at 20℃ DP:0.1MPa)
Liquid　5mL/min～2L/min(H₂O at 20℃ DP*:0.1MPa )
*DP means Operating differential pressure condition.

Multidial Type Precision Needle Valve (Ideal for restriction of flows by dial control operation) MODEL 2412M SERIES. This is an enhanced model of the KOFLOC Precision Needle Valve Model 2412 (see page 116), which now incorporates a multidial that allows the user to set desired flow rates by dial operations. This valve makes the most of the rotation-to-flow linearity and repeatability performance of the 2412 needle.
 

■Fluid：
Gas　N₂,Air,H₂,He,Ar,O₂,CO₂ etc.
Liquid　H₂O
■Flow range：
Gas　5mL/min～100L/min(Air at 20℃ DP:0.1MPa)
Liquid　5mL/min～2L/min(H₂O at 20℃ DP:0.1MPa)
*DP means Operating differential pressure condition.

Variable Secondary Pressure Flow Controller MODEL 2203 SERIES.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.

■Fluid：N₂,Air,H₂,He,Ar,O₂,CO₂ etc.
■Frow range：10mL/min～20L/min(Air at 20℃)

Variable Primary Pressure Flow Controller MODEL 2204 SERIES.Model 2204 Variable Primary Pressure Flow Controller is a control valve that always keeps flows at a constant rate under a given constant level of secondary pressure (outlet pressure) even when the primary pressure (inlet pressure) fluctuates. The built-in precision needle valve accurately controls flows to the set flow rate, including ultra-minute flows.

■Fluid： Gas： N₂,Air,H₂,He,Ar,O₂,CO₂ etc.
■Flow range： Gas 10mL/min～10L/min(Air at 20℃)

Small Proportional Solenoid Valve MODEL 3000 SERIES.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.

■Fluid：Gas：N₂,Air,H₂,He,Ar,O₂,CO₂ etc.