Flow Adjustment Valve

LK 435 OptiFlow

• With MemoStop for locking setting

• Adjusted with Allen key while reading off flow

on a clear scale

TECHNICAL DATA

Max. working pressure

1.0 MPa (10 bar)

Max. differential pressure

100 kPa (1,0 bar)

Working temperature

Water/Glycol 50/50%

Water/Ethanol 70/30%

Min. -20 °C / Max. 80 °C

(90 °C briefly)

Min. -20 °C / Max. 70 °C

(85 °C briefly)

Media

Water - Glycol mixture max. 50%

Ethanol mixture max. 30%

Material valve body

Nickel-plated Brass EN 12165

CW617N

Measure accuracy

Flow meter: +/- 12%

Flow ranges

2-16 l/min, 4-36 l/min

Thread standard

Adjustment valve inlet: M - male

Adjustment valve outlet: F - female

VALVE CHARACTERISTICS

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 us-

ing 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 direct-

ly 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.

WITH LK 430 MANIFOLD RF

6.0

5.0

4.0

3.0

K

v

(

m

3

/

h

)

2.0

1.0

0.0

OptiFlow 2�16 (Kvs 3.5)

OptiFlow 4�36 (Kvs 4.5)

0

1

2

3

4

5

6

7

Number of turns

161