Low Flow Control Valve

Control valves can be furnished as an integral part of a mass flow controller, a pressure controller, or as a separate component in combination with a gas flow meter, liquid flow meter, or a pressure meter. The proportional, electromagnetic control valves, from Bronkhorst, feature fast and smooth control characteristics. With reference to the specific fields of application there are different series of unique control valves options.

• Direct acting valves
• Vary-P valves
• Pilot-operated valves
• Pressure compensated bellow valves
• Liquid flow valves
• Manual control valves

Low Flow Control Valve for Gases

Flow control valves F-001 / F-011 are suitable for low flow rates (up to approximately 65 ln/min) with pressure ratings up to 100 bar. The F-001 valve module is also used as a pilot valve in bigger valves and controllers. F-021 is a direct acting control valve for high pressure applications up to 200 bar.

• F-001: flow up to 65 ln/min; pressure up to 64 bar; Kv-max of 6.6 x 10^-2
• F-011: flow up to 65 ln/min; pressure up to 100 bar; Kv-max of 6.6 x 10^-2
• F-021: flow up to 70 ln/min; pressure up to 200 bar; Kv-max of 1.56 x 10^-3

High Pressure Flow Control Valve for Gases

F-033 / F-042 2-phase flow control valve for applications with high differential pressures and a maximum operating pressure of up to 700 bar. These unique valves feature a pressure compensation mechanism, thus maintaining a constant pressure difference of 4 bar across the flow control section. As a result, both the inlet pressure and the outlet pressure may change without having any impact on the Vary-P valve function.

• F-033: flow up to 100 ln/min; pressure up to 400 bar
• F-042: flow up to 100 ln/min; pressure up to 700 bar

Control Valves for Low Pressure Drop Applications

These are direct acting control valves similar to the F-001 series. They are closed by spring force and a bellows compensates the closing force acting on the plunger to such a degree that only a very small magnetic force is necessary. In this way, large orifices can be open, which is impossible in the F-001 design as it would cause oscillation. The bellows pressure compensated design, however, enables users to smoothly control large flows at extremely low pressures.

• F-004A: flow up to 400 ln/min; Kv of 0.03 to 0.3
• F-004B: flow up to 1,300 ln/min; Kv of 0.1 to 1.0

Liquid Flow Control Valves (Direct Acting Valves)

Bronkhorst liquid flow meters can connect to a control valve to form a closed control loop. The standard direct acting valve, model C2I, is normally closed, has a pressure capability of 100 bar (1500 PSI) as well as a purge connection for easy elimination of air or gas. Model C5I is ideal for liquid flow applications with higher flow rates and pressure rating up to 100 bar, however, this control valve may also be used for gas flow applications. C2I and C5I control valves directly operate via a magnetic coil with IP65 (weatherproof) housing and are closed when de-energized (Normally Closed). Depending on flow rate and fluid, these liquid flow control valves allow a pressure drop of maximum 5 to 40 bar (d).

• C2I: pressure up to 100 bar; Kv-max of 2.37 x 10^-3
• C5I: pressure up to 100 bar; Kv-max of 6.6 x 10^-2

FLOW-CONTROL Series - Manual Control Valves with Pressure Compensation

The new FLOW-CONTROL Series are manual control valves for extremely precise control of a constant flow rate in low flow gas and liquid applications. The desired flow rate is set via the needle valve. Any upstream or discharge pressure variations are automatically compensated by a built-in membrane operated valve to ensure a steady, constant flow. Thanks to its clever design and construction, these instrument models do not require any electrical power source. The manual constant-flow control series is available in 4 different models to control flow capacities in a range from for gas of up to 50 ln/min and 3 models with up to 1.8 l/min. While process connections are optionally available, the in-line valve assemblies feature G 1/4 BSPP female inlet and outlet ports.

• Gas flow up to 50 ln/min
• Liquid flow up to 1.8 l/min
• Operating pressure up to 10 bar(g)
• IP65 ingress protection

FLOW-ADJUST Manual Control Valve

The new FLOW-ADJUST manual control valves offer extremely precise control in low flow gas and liquid applications. These manual control valves are available in 2 standard resolution (SR) options and 5 high resolution (HR) models, each offering smooth control of gas or liquid flow. The standard resolution needle valves cover the two highest flow ranges whereas the high resolution valves cover the lower gas and liquid flow ranges.