Product Identification - Bosch Rexroth HAD 1 Series Operating Instructions Manual

18/44 Product information
Bosch Rexroth AG, Type HAD...-1X/ and HAD...-2X/, RE 50150-B/10.20
Fig. 3: Structure of the gas port
1 Gas port
2 Diaphragm
3 Closing button
4 Fluid connection
5 Container
Diaphragm type accumulators consist of a pressure-resistant vessel (5) made of
high-tensile steel which most commonly has a spherical or cylindrical form.
The hydraulic accumulator is subdivided into a gas and a fluid side by
a diaphragm (2) made of an elastic, flexible material (elastomer).
When the operating pressure is increased, hydraulic fluid is flowing into the
diaphragm type accumulator and compresses the gas until the gas pressure is
identical to the fluid pressure.
When the operating pressure is reduced, the gas expands again and
feeds the hydraulic system with fluid.
The closing poppet (3) located at the bottom of the diaphragm completely covers
the fluid connection (4) when the diaphragm type accumulator is discharged, thus
preventing the diaphragm from exiting into the fluid channel and being damaged.
Via the gas port (1), the gas side of the diaphragm type accumulator is charged with
nitrogen to the provided pre-filling pressure p
and filling device (material number: 0538103012 for diaphragm type accumulators).
The gas filling screw has a slotted thread and should therefore not be removed
completely. In order to protect the gas port, a cover cap (6) is provided on the gas
port.
More detailed information on operating conditions, connection dimensions, weight
and limits of performance is provided in data sheet 50150.

5.2 Product identification

The diaphragm type accumulator can be identified by means of its embossing on the
housing.
6 Cover cap on the gas port
7 Fluid connection protective cap
8 Gas filling screw with venting groove
9 Seal ring (below the gas filling screw)
at the factory or by means of a test
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