4.3 Appropriate safety measures must be taken at the place of installation of the valves if the medium that
discharges upon actuation of the valve can lead to direct or indirect hazards to people or the
environment.
4.4 Pressure limiting valves are to be installed vertically, if possible, and with the bonnet pointing upward. A
different installation position must be clarified with the manufacturer.
4.5 Overflow valves can be installed in any position. The function of the valves is guaranteed in every
position.
4.6 During assembly always make sure not to apply any force when fastening the connecting thread and not
to screw it in too far, as this could damage the seat of the valve. Do not allow sealing material such as
hemp or Teflon to penetrate into the valve.
5. Setting
5.1 The valves can be delivered with a set pressure and sealed by the factory or without set pressure with
the desired range of adjustment.
5.2 Valves which have been set and sealed by the factory are marked with the set pressure. Before changing
the set pressure the seal has to be removed. If valves are unsealed, the desired pressure can be set
within the pressure range of the spring.
5.3 In the case of ATEX versions for categories 1 and 2 and unset gastight valve versions, the valves must be
tested after setting in order to guarantee their gas tightness.
5.4 Setting Procedure;
a) Unscrew the cap nut (7) and remove the copper gasket (8).
b) Release locknut (3).
c) Turn pressure screw (4): Clockwise to increase the set pressure, counter clockwise to reduce the
set pressure.
d) Tighten the locknut (3) again and mount the copper gasket (8).
e) Screw on the cap nut (7) and tighten.
6. Operating and Maintenance
6.1 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.
6.2 In the event of minor leaks, the valves can be made to respond by applying overpressure. 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.
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 stamped on the valve body.
