Technical data
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Working temperature:
Water/Glycol 50/50% Min. -20°C / Max. +80°C (+90°C briefly)
Water/Ethanol 70/30% Min. -20°C / Max. +70°C (+85°C briefly)
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Max. working pressure:
1.0 MPa (10 bar)
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Max. differential pressure:
100 kPa
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Media 1:
Water - Glycol mixture max. 50% Ethanol mixture max. 30%
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Material, valve body:
Nickel-plated Brass EN 12165 CW617N
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Other data:
Flow ranges: 2-16 l/min, 4-36 l/min
Accuracy, flow meter: +/- 12%
Thread standard, adjustment valve inlet:
G - male thread
Thread standard, adjustment valve outlet:
G - female thread
LK 435 OptiFlow is a group valve for flow adjustment of hydraulic systems such as underfloor heating, traditional heating and cooling systems. Adjustments are easily made using an Allen key. No measuring equipment is needed. The flow rate is read off directly from the visual flow indicator. The flow meter continuously measures and displays the actual flow rate during operation.
LK 435 OptiFlow has a MemoStop function for locking the setting. This means that the valve can be used as a shut-off valve without losing settings. A marking plate for labelling and documenting the setting is enclosed. LK 435 OptiFlow can be supplemented with a thermometer and threaded union parts, straight or angular, with rotating nut for simple assembly to, for example, an LK 430 Manifold RF - see under Accessories. The thermometer is placed in the valve’s integrated sensor pocket.
The valve can be mounted in any position. The arrow on the valve body indicates the flow direction. For accurate measurement a straight piece of tube at least of the same length as the valve body should precede the balancing valve. When assembling to an LK 430 Manifold RF the adjustment valve can be fitted directly to the manifold, thus replacing the shut-off valve.
The flow meter is designed so that the fluid does not flow through the glass in order to protect it from debris and dirt. However, after a period of time the glass may still have to be cleaned as the fluid often becomes contaminated and blackened. It is then easy to remove the glass to clean it. The function/setting of the valve is not affected by deposits in the glass.
Except for cleaning of the glass, the group valve normally requires no maintenance. The installation should be checked regularly.