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9 Operation
Incorrect area of application!
The approval according to Pressure Equipment Directive and thus the safe pressure
limiting function are no longer applicable if the safety valve is used incorrectly or
outside its area of application.
Do not use the safety valve as high-response valve!
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For information on the operation, please refer to the operating instructions for
the hydraulic system into which the safety valve is installed.
If errors occur, refer to chapter 14 "Troubleshooting".
9.1 General information on the operation
It must be ensured that
• Discharge lines of safety valves end in a risk-free manner.
• No fluid can accumulate in the discharge lines.
• No more valves, shut-off cocks, etc. are installed in the discharge lines.
9.2 Setting the valve to a low response pressure
When setting the valve, please ensure that the attached name plate is not
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damaged or torn off.
You can set safety valves which have been provided with a hand wheel or rotary knob
to a lower response pressure without damaging the lead seal. To do this, the system
into which the safety valve is installed needs to be equipped with a pressure gauge
which indicates the pressure at port P or a pressure gauge has to be connected
temporarily to the additional P port, which is normally closed by a plug screw.
The response pressure of a safety valve may only be within the specified pressure
range due to the installed compression spring. For the setting range of the
relevant response pressure, refer to table 8. The maximum flow indicated by the
component marking can only be utilized within this pressure range.
1.
Temporarily deactivate or remove any other pressure limiting devices which are
installed in the system and have an impact on channel P and seal any openings
which were caused by this.
2.
For systems without a pressure gauge installed in channel P, connect a pressure
gauge at the additional P port; see also chapter 7.10 "Additional P port (only with
response pressure up to 400 bar)".
3.
Unload the valve spring as described in chap. 10.2.3 "Unloading a safety valve of
type DBDH..1X/..E", screw in the adjustment spindle again as far as possible but
do not tighten the lock nut yet after unloading the spring.
4.
Switch on the system and wait until the system pressure has built up.
WARNING
RE 25402-B/10.21, DBD...1X/..E, Bosch Rexroth AG
Operation
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