Bosch Rexroth HED 8 Series Manual page 3

Function, section
The hydro-electric pressure switch type HED 8 is a piston
type pressure switch. It basically comprises of housing (1),
installation kit with piston (2), compression spring (3),
adjustment element (4) and micro switch (5).
If the pressure to be monitored is below the set pressure,
the micro switch (5) is operated. The pressure to be moni-
tored is applied via the nozzle (7) at the piston (2). The
piston (2) is supported by the spring plate (6) and acts
against the continuously adjustable force of the compres-
sion spring (3). The spring plate (6) transmits the move-
ment of the piston (2) onto the micro switch (5) and
releases the latter when the set pressure is reached. This
switches the electric circuit on or off, depending on the
circuit set-up. The mechanical positive stop of the spring
plate (6) protects the micro switch (5) in case of a sudden
pressure drop from mechanical destruction and, in case of
overpressure, prevents solid compression of the compres-
sion spring (3).
Notes:
In order to increase the life cycle, the pressure switch
should be mounted with low vibrations and protected
from hydraulic pressure surges.
Symbol
P
7 2
P
Type HED 8 OH-2X/...K14
Type HED 8 OH-2X/...K14S
7 2
P
Type HED 8 OP-2X/...K14A
Type HED 8 OP-2X/...K14AS
7 2 5
P
Type HED 8 OA-2X/...K14KW
Type HED 8 OA-2X/...K14KS
RE 50061, edition: 2016-09, Bosch Rexroth AG
Pressure Switch | HED 8
5 6 3 1 4
5 6 3 1
6 3 1 4
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