Bosch Rexroth M SED 10 XN Series, Руководство по эксплуатации

Страница: 13 / 48

Safety instructions 13/48
RE 22045-XN-B/05.17, M-.SED 10...XN..., Bosch Rexroth AG
Contact with salt water leads to increased corrosion at the valve. This may
chemically corrode and damage individual components of the valve. So take
suitable corrosion protection measures.
2.7 notices on the valve use
Observe the following information during project planning:
▶ If the annulus area of differential cylinders is not connected to port A, a pressure
peak is created in port B during the switching process due to the pressure
intensification. This pressure peak may exceed the maximum operating pressure
over the permissible limit.
▶ To ensure proper functioning, the valve must be bled.
▶ If due to the operating conditions to be expected during the switching processes,
flows have to be anticipated that exceed the performance limits of the valves
that can be seen from the characteristic curve, a valve with throttle insert must
be used in channel P for flow limitation. With a 4/2 directional seat valve with
Plus-1 plate, the throttle insert for flow limitation does not have to be inserted in
port P at the valve body but rather in port P of the Plus-1 plate.
▶ Ports P, A, and T of a 3/2 directional seat valve or P, A, B, and T of a 4/2
directional seat valve are clearly assigned according to their function and must
not be exchanged or closed. The flow is only admissible in the direction of arrow
specified in "Data sheet 22045-XN".
▶ In order to switch the valve safely or maintain it in its spool position, the pressure
at the respective ports must satisfy the following condition:
– P ≧ A ≧ T for the 3/2 directional seat valve, and/or
– P ≧ A ≧ B ≧ T for the 4/2 directional seat valve.
▶ With a 4/2 directional seat valve with Plus-1 plate, the minimum pressure must be
8 bar and the minimum flow must be 3 l/min.
▶ Switching off the valve solenoid results in a voltage peak due to the inductive
effect. Additional switching measures have to be taken in order to avoid any
influence of the residual voltage peak on connected operating media. The
maximum residual voltage peak of 500 V must not be exceeded.