Type 3285

10 | 15

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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.

Derating curve for standard version

Derating curve for positioner and process controller

5 10

10

15 20

20

30

40

50

60

70

80

90

100

25 30 35 40 45 50 55 60 65

max. ambient temperature [°C]

Normal mode

Power saving mode

5 10

10

15 20

20

30

40

50

60

70

80

90

100

25 30 35 40 45 50 55 60 65

max. ambient temperature [°C]

Normal mode

Power saving mode

6.2. Pressure range

Note:

For orders from our standard product range, use the product filter in our eShop (see “9.1. Bürkert eShop” on page 14).

Alternatively, you can use the Product Enquiry Form (see “9.4. Bürkert Product Enquiry Form” on page 15) for information about the

device layout and send it to us after completion.

Valve function

Seat size

Port connection1.)

K

VS-value water

Pressure range3.)

[mm]

[m³/h]2.)

[bar(g)]

Control valve, without

safety position in case of

power failure

8

G ½

1.8

6

10

G ½

2.5

6

12

G ¾

3.9

6

15

G ¾

5.4

6

20

G 1

8.1

6

25

G 1

9.6

6

1.) Other port connections (NPT, …) on request

2.) Measurement at + 20 °C, 1 bar pressure difference above the fully open valve

3.) Fuel gases may vary

Further versions on request

Temperature

Low temperature variant:

Suitable for minimum medium temperatures down to - 30 °C

(sealing material EPDM) (optional)

5

bar

0

Pressure

Vacuum variant:

This variant is suitable up to - 0.9 bar(g) (optional)