Burkert Type 8630 Manuel d'utilisateur télécharger pdf (Page 65)

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OPERATION AND CONTROLLER FUNCTIONS

CHARACT

Selection of the transfer characteristic between input signal (position setpoint)

and stroke (correction curve)

Customized characteristic

Factory setting:

CHA LIN

With this function, you can select a transfer characteristic with respect to setpoint position (setpoint

position CMD) and valve stroke (POS) to correct the flow or operating curve.

The flow characteristic k

= f(s) describes the flow through a valve, expressed by the k

value, as a

function of the stroke s of the actuator spindle. It is determined by the shape of the valve seat and the

seat seal. In general, two types of flow characteristic are realized: the linear and the equipercentile.

With linear characteristics, equal changes in stroke ds are allocated to equal changes in k

value dk

(dk

= n

lin

* ds).

With an equipercentile characteristic, a change in stroke ds corresponds to an equipercentile change in

value

(dk

= n

gleichpr

* ds).

The operating characteristic Q = f(s) represents the relationship between the volumetric flow Q passing

through a valve installed in a system and the stroke s. This characteristic contains the properties of the

piping, pumps and consumers. It hence has a different shape from the flow characteristic.

Linear characteristic

Equipercentile characteristic 1:25

Equipercentile characteristic: 1:33

Equipercentile characteristic 1:50

Inverse equipercentile characteristic 25:1

Inverse equipercentile characteristic 33:1

Inverse equipercentile characteristic 50:1

User-defined characteristic, freely

programmable via fixed points

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Burkert Type 8630 Manuel d'utilisateur Page 65