System Description; Intended Application Area; Function Of The Positioner And Combination With Valve Types - Alfa Laval TopControl Basic Manuel D'utilisation

Type 8694

System description

5. sysTem descripTiOn
5.1. intended application area
The positioner Type 8694 is designed to be mounted on pneumatic actuators of process valves for the control of
media.
5.2. function of the positioner and combination with
valve types
Positioner Type 8694 is an electropneumatic position controller for pneumatically actuated control valves with
single-acting actuators.
Together with the pneumatic actuator, the positioner forms a functional unit.
The control valve systems can be used for a wide range of control tasks in fluid technology and, depending on the
application conditions, different process valves from the Alfa Laval range can be combined with the positioner. Dia-
phragm valves or ball valves fitted with a control cone are suitable.
"Figure 1" shows an overview of the possible combinations of positioner and different pneumatically actuated valves.
Different actuator sizes and valve nominal widths, not illustrated here, are available for each type. More precise
specifications can be found on the respective data sheets. The product range is being continuously expanded.
with angle seat valve
Type 2300
Figure 1: Overview of possible combinations
The position of the actuator is regulated according to the position set-point value. The position set-point value is
specified by an external standard signal.
Positioner Type 8694
with straight seat valve
Type 2301
with angle seat valve
Type 2702
English
with diaphragm
valve
Type 2730
11