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6.4 Configuring the setpoint
Always open the valves in lines before or after the pressure regulator slowly and avoid pressure shocks!
Spring-loaded model ZM-R und LPR:
Slowly open the valve or ball valve before or after the pressure regulator and set it to a small flow of approx. 1 to 2
Nm³/h.
Set the desired pressure by turning the setting screw (6 mm hexagon socket).
Warning! Observe the maximum values on the nameplate.
Clockwise rotation = Decreasing secondary pressure p
2
Counterclockwise rotation = Increasing secondary pressure p
2
Dome-loaded model (ZM-R/D and LPR/D):
With an additional pilot controller, the dome pressure can be set to the desired value. Up to 1000 mbar and/or 2000
mbar of dome pressure is permissible depending on the device type. Precise adjustments can also be made via the
setting screw on the spring dome.
7 Impulse line (C-connection)
An impulse line must be able to communicate with the p
1
side of the valve under any circumstances. Accordingly, no
valves or other flow resistances may be present in the secondary, non-turbulent flow area between the device and
impulse line pickup. Otherwise, the device is not functional and may even be destroyed.
If the impulse line is not connected, there is also a risk of damaging or destroying the devices, depending on the inlet
pressure.
For
ZM-R15, ZM-R25
device types, an impulse line (G1/4 connection) is recommended if:
- P
1
≥ 8 bar at Kv 0.65
- P
1
≥ 4 bar at Kv 1.25
- Generally for Kv 2 and 2.5
Connection
≥
300 mm from the center of the device
(or directly at the process for longer lines)
An impulse line must not be tapped in a turbulent zone.
For
LPR
, the impulse line is optional and is not required for standard applications.
8 Maintenance and repairs
The previously mentioned pressure regulators work without auxiliary energy and are maintenance-free. Additional
queries may be processed only by specifying the serial number.
The serial number must be specified for spare part orders.
Device returns for repair or modification can be accepted only if they have been cleaned and have a completed RMA
according to the applicable regulations. In the case of hazardous media, we recommend returning the device
disassembled and cleaned.
8.1 Inspection intervals
An annual review of the function or maintenance is recommended depending on the characteristics of the medium and
the respective operating states. Depending on these results, the testing/maintenance interval can be shortened or
extended by the operator/user.
