7 Functional description
ARCA Regler GmbH
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Series 812-DWK
03.2020 / 1.0
7
Functional description
The series 812-DWK has been developed as a double-action, pneumatic
piston actuator for linear valves. The centrally located actuator stem (1)
is coupled to the actuating spindle of the valve by means of a coupling.
The actuator stem (1) is precisely guided by a plain bearing (5) and the
lower pressure chamber is sealed by a special sealing element with a
wiper (3). Connected to the actuator stem (1) is a piston (77), which
transmits the movement to the actuator stem (1). An intermediate ring
(76) with a sealing ring (79) divides the actuator housing (108, 118) into
the two pressure chambers. If the pressures in the pressure chambers
are different, the piston (77) moves together with the actuator stem (1)
and actuates the linear valve.
1
3
5
77
76
79
118
108
Illustration 6:
Sectional drawing
