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6
Operating and Maintenance
The operating pressure of the plant is to be at least 5 % lower than the closing pressure of
the valve if it is used as a pressure limiting valve. In this way, the valve can satisfactorily close
again after blowing off.
In the event of minor leaks, the valves can be made to respond by lifting the lever for version
618, 628 sGFL (the lever is not used for adjusting the valve!), or by applying overpressure for
the remaining model series. If this does not remove the leak the valve has to be overhauled.
After long periods of non-use the function of the valve must be tested.
For the valves of the types 418, 428 (fig. h) and 630/430 / 631/431 (fig. i) there is a replace-
ment cartridge which can be changed when the installation is pressureless. For the type
418, 428 the cartridge can be delivered as a replacement part which was preset and sealed
at the factory.
Fig. h): Type 418 / 630 / 430 / 631 / 431:
1. Make sure that the system is de-pressurised.
2. Pull out the entire replacement cartridge by turning the spanner flats above the angular
body using a suitable open-ended spanner.
3. Check the contour and installation of the new cartridge. If necessary, reset the response
pressure as described in a).
Fig. i): Type 418 / 630 / 430 / 631 / 431:
1. Make sure that the system is de-pressurised.
2. Remove plastic protective cap; loosen counter-nut.
3. De-tension the spring by turning the setting spindle clockwise.
4. Unscrew spring housing or remove screws.
5. Remove spring housing, spring plate, setting spindle, and spring.
6. Re-fit two screws on opposite sides of the body. These are required as supports for the
levering tools (only required for sizes DN65 and DN80). By means of two screwdrivers (
levering tools ) remove the complete valve insert (fig. b) and replace with a new one.
7. Installation is carried-out in reverse order. In the case of sizes DN65 - DN100 tighten the
screws equally with a maximum torque of 25 Nm, this value must not to be exceeded!
7
Warranty
Every valve is tested prior to leaving the factory. We grant a warranty for our products
which entails the repair, free of charge, of any parts that are returned and verified as being
prematurely unsuitable for use due to defective material or manufacturing. We shall not
assume liability for any damage or other such obligations. If the factory seal is damaged (in
the case of pressure limiting valves), in the event of any incorrect handling or installation,
contamination or normal wear, warranty claims shall be null and void.
8
Marking
Valves adjusted at the factory have the set pressure marked in a permanent manner on the
nameplate or on a brass label that is attached to the valve. For valves that are not adjusted at the
factory the range of adjustment for the installed spring is specified on it.
Assembly and maintenance instructions - 418, 428, 608, 617/417, 618, 628, 630/430, 631/431, 853/453
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