Type 3281

12 | 17

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6.

Performance specifications

6.1. Duty cycle derating diagram

Note:

• The duty cycle is an important factor for motor valves. The self-heating of the engine limits the maximum duty cycle. High ambient

temperatures additionally increase the risk of damage due to overheating. The following diagram shows the recommended maximum

duty cycle as a function of the ambient temperature. In energy-saving mode (lower driving force), higher duty cycles are possible. The

motor is optimised for the valve function in terms of size, power consumption and costs.

• The duty cycle does not mean the duty cycle of the device but the duty cycle of the motor. This is only switched on when the valve is to

move. Frequent set-point value changes drastically increase the duty cycle of the motor.

• Operating the valve outside the recommended duty cycle limits will result in a significantly reduced service life of the valve.

10 %

20 %

30 %

40 %

50 %

60 %

70 %

80 %

90 %

100 %

0

5

10

15

20

25

30

35

40

45

50

55

60

Ambient temperature [°C]

Derating curve for max. medium temperature (130 °C)

6.2. Pressure range

Standard version

Note:

For orders from our standard product range, use the product filter in our eShop (see “9.1. Bürkert eShop” on page 16).

Alternatively, you can use the Product Enquiry Form (see “9.4. Bürkert Product Enquiry Form” on page 17) for information about the

device layout and send it to us after completion.

Valve function

Seat size

Port connection

K

VS value

Pressure range

[mm]

[m³/h]1.)

[bar(g)]

Control valve, without

safety position in case of

power failure

4

G ½

0.57

0…16

6

G ½

1.25

0…16

8

G ½

1.8

0…12

10

G ½

2.25

0…7

1.) Flow value for water, measurement at + 20 °C, 1 bar pressure difference above the fully open valve