Marking; General Information On Safety Valves; Gaskets And Leaks - Leser 4401 Instrucciones De Servicio

Operating Instructions
3

Marking

EN
After setting and testing, each safety valve
is sealed. Only if the seal is undamaged is
it assured that the safety valve will operate
in accordance with the marking.
The component marking attached to the
safety valve (type plate) provides infor-
mation about the following, among other
things:
• order data (serial number),
• technical data,
• set pressure,
• VdTÜV component test number,
• CE marking with number
of the specified centre,
• UV marking if applicable.
Other markings can be applied in accord-
ance with the requirements of the applied
standards, for example:
• marking with a marking stamp,
• cast marking,
• hammered-in marking
(e.g. for threaded safety valves),
• separate marking
(e.g. for the heating jacket),
• warning tags
(e.g. for a test gag).
If there are technical changes to a
safety valve, then the markings must be
changed as well.
9
4 General Information
on Safety Valves

4.1 Gaskets and Leaks

Safety valves are manufactured with high pre-
cision. Above all, the sealing surfaces of the
safety valves are processed very carefully.
Soft sealing and metallic sealing safety
valves are differentiated.
Metallic sealing safety valves fulfil the seal
tightness requirements of the national and
international standards.
A variety of soft seal materials are offered
for soft sealing safety valves. The soft seal
material must be selected in accordance
with the area of application. The choice is
dependent on the medium, pressure and
temperature.
The operator is responsible for the compat-
ibility between the fluid and material used.
A check gauge can be used to detect leaks.
For spring-loaded safety valves, bellows
can be used to prevent media from leak-
ing out.
A collecting tank can be used to collect any
leaking media.
For models with bellows that are operated
with an open bonnet, the instructions re-
garding the open bonnet apply.