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The VFL volume flow limiter simply deals with what is normally the tedious and xpensive process of adjusting flow rates in ventilation and air conditioning systems. Easy installation and precise operation saves precious time on site. The required volume flow rate can be simply set up at the point of installation when the VFL is fitted into the duct work.
The VFL controls to the set volume flow rate keeping it constant within strict tolerances even when the upstream pressure changes.
circular
4 – 250 l/s
15 – 900 m³/h
8 – 530 cfm
Δp: 30 – 300 Pa
Ø 80 – 250 mm
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Description
- Circular volume flow controller for low velocities
- Suitable for constant and variable volume flow systems
- Selection according to nominal size of the duct system
- Commissioning in one step
- Flow rate adjustment without special tools
- Retrofit of actuator easily possible
Characteristics
- Mechanically system powered, without external power suplly
- The flow rate can be set with an external scale
- Highly precise regulation of the volume flow to ± 10 %, relative to Vnominal
- Orientation-independent and maintenance-free
- Suitable for supply or extract air
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TROX VARYCONTROL TVR-Easy type air terminal units are circular control units and were developed for the control of air flow in supply and extract volume flow systems.
The nominal size is selected according to the flow rate range specified by the consultant.
The setpoint values are set exactly using the flow rate scale attached to each controller.
Characteristics
Flow rate set-up without software and hardware (adjuster units)
Functional check by indicator light and service button
Aerodynamic function test of each box using a dedicated test rig
form: circular
10 – 1,675 l/s
36 – 6,030 m³/h
23 – 3,549 cfm
Δp: 20 – 1,000 Pa
Ø 100 – 400 mm
Casing air leakage flow rate complies with DIN EN 1751, class A
Control damper closed blade leakage complies with DIN EN 1751, class 4 (nominal size 100 and 125, class 3)
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Flow 1,2,3,4,6,8,10,12,16,20,25,30 l/min. water
Connection G 1/2, G3/4 (up to DN 500 on request)
Material brass, st. st.
Max. pressure 10 bar
Max. temperature 300 °C
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Lee Company restrictors have become the accepted “standards” worldwide. Design engineers find their small size, light weight, and proven reliability are indispensable when the flow of fluids has to be controlled.
Our miniature precision flow restrictors are specified by manufacturers of aircraft hydraulic and fuel control systems, oil drilling equipment, missile controls, machine tools, and countless other products. Lee restrictors are a vital part of almost every military and commercial aircraft manufactured in the world. By employing already proven and qualified Lee restrictors in their designs, design engineers are using their own time and talents much more productively.
Lee offers a wide selection of single-stage or multi-stage orifices. Lee Jets, High Watt and Kilowatt Jets, and the Lee Microjet are all single orifice restrictors. Lee High Watt and Kilowatt Jets handle low Lohm rates (high flow rates) while higher Lohm rates (lower flow rates) are covered by Lee Jets.
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The STAUFF Hydraulic Accessories programme has been carefully designed to offer a range of components suited to the demands of building hydraulic systems in most industrial and mobile applications.
Whether you require simple filler breathers or precise electrical level switches, flow control valves or complete filter units; the STAUFF Hydraulic Accessories range should provide you with the choice you need.
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