1. General Remarks
Our leaflet 630.00 gives full information with technical data, different versions and dimensions of the pilot RMG 630 a.
Our brochure "General Operating Instructions for Gas Pressure Regulators and Safety Devices" will be useful to
fit the pilot into the line, put it into service and find faults that might disturb the operation.
The construction, set-up, supervision and maintenance of gas pressure regulating stations are subject to special
technical rules which should be strictly observed, in particular those given by the DVGW Worksheets G 490, G 491,
and G 495.
The frequency of periodical maintenance to be foreseen for the pilot RMG 630 a should be determined according
to the prevailing service conditions and the type and composition of the gaseous medium. We, therefore,
abstain from imposing any fixed intervals and would rather refer you to the recommendations given by the
DVGW Worksheet G 495.
For maintenance all parts are to be cleaned and subjected to a thorough visual inspection. A visual inspection
should not be omitted when the course of operation or performance tests have shown lack of regulating accuracy.
Particular care should be given to the checking of sealings and diaphragms, as well as of all carrying and movable
parts. Damaged parts should be replaced by new ones.
The item numbers referred to in the maintenance instructions are identical with those of spare parts drawings and
spare parts lists.
We recommend to keep all parts that are specially marked in the spare parts lists in stock for prompt maintenance
availability.
630.20 p.2
2. Special Operating Instructions
2.1 Start-up valve
Depending on size, the gas pressure regulators RMG 402/502/503 are provided with a start-up valve to facilitate a
quick pressure compensation to be effected at the regulations diaphragm upon pressurization.
The following regulators wil be provided with a start-up valve:
•
Before pressurizing open the start-up valve.
• After pressurizing close the start-up valve.
2.2 Adjusting the load limiting pressure
RMG 402
RMG 502/503
from DN 50 with pilot RMG 630a/640
from DN 80 with pilot RMG 620/630a/640
DN 80/150, 100/200
RMG 502, 503
approx 10-15 bar
RMG 402
approx 5-10 bar
The level of the adjusted load limiting pressure exerts a great
influence on the regulating accuracy of the pilot. In the order to
reach a high regulating accuracy combined with a low closing
pressure the load limiting pressure should be raised to such a
level as would not prejudice the operational stability of the gas
pressure regulating station. We recommend to set the load
limiting pressure as follows :
Load limiting setpoint level above
the outlet pressure with regulators
