FLOW CONTROL
POSIFLOW
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| POSIFLOW proportional valves can be used in practically all applications in which the
flow of a liquid or gas needs to be controlled. Since a single proportional valve
replaces two or three conventional valves connected in parallel (NO / NC) to obtain
low, medium or high flow rates, it is extremely cost and space saving. The core is
guided by two rider rings so that the valve has low friction and high dynamic
properties. An electronic control unit which is directly fitted onto the POSIFLOW
increases its range of application even further.
The integrated potentiometer is used to adjust minimum current, maximum current
and frequency. A current ramp which can be altered by a potentiometer can also be
connected. Thus slow changes in flow can be obtained in spite of sudden changes in
the set-point. In case of set-points < 200 mV (<0.4 / 4.4 mA), the piloting current is
completely switched off, so that the valve is without current (tightly closed function). |
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OPERATING PRINCIPLE
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| Closed
The core is guided down by two
rider rings and the flow from port 2
to port 1 is released.
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Half length
The core is guided up by two rider
rings and the flow from port 2 to
port 1 is released.
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Open
The core is maintained in its central
position: the flow between port 2
and port 1 is blocked, proportionaly
to the command
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| TECHNICAL CHARACTERISTICS |
| Fluids : |
Air, gases, liquids |
| Pressure range: |
Vacuum to 8 bar |
| Connection: |
M5, G 1/8, G 1/4, G 3/8, G 1/2 |
| Flow: |
0 to 35 l/min H2O |
| Construction : |
Poppet valve |
| Actuation : |
Proportional solenoid |
| Piloting: |
With electronic control unit
0-10 V, 0-20 mA, 4-20 mA |
| Options : |
Stainless steel housing
Special seals
Explosion-proof version
Bellows sealing |
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| Advantages : |
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Space and cost saving |
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Precise regulation:
- Hysteresis<5%
- Repeatability<3%
- Sensitivity<2% |
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Integrated temperature compensation |
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Ramp function for smooth reaction to
sudden changes in the input signal |
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Optimal flow without waterhammer |
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Switch-off function (tightly closed) |
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Remote control / long cable |
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 Literature
Direct operated, normally closed, M5/subbase connection, brass body
Direct operated, normally closed, 1/8, brass or stainless steel body
Direct operated, normally closed, 1/4-3/8, brass or stainless steel body
Pilot operated, normally closed, 3/8 - 1/2, brass body
Flow control applications
Non-animated
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