Goetze Hygienic 400, Assembly Instructions Manual

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www.goetze-armaturen.de Assembly and maintenance instructions - 400 / 400.5
The working pressure of the installation should be at least 5% below the closing
pressure of the safety valve. This means that the safety valve can close correctly
again after blow off. In case of minor leaks caused by impurities between the
sealing surfaces, the valve can be cleaned by lifting it up to blow off.
The lifting device takes place, specific to the design, using the handwheel (3) above
the bonnet (fig. a) by turning it in an anti-clockwise direction. The handwheel (3)
must then be turned back to the end stop point.
CIP and SIP are guaranteed using the manual lifting device (fig. a) on the valve plate.
With these valves, the full top section with the function unit can also be removed
and specially cleaned (fig. b) by simply loosening the fixing clip (4) after depressuri
-
zing the installation.
Make sure that the valve is not pressurized before dismantling.
Make sure that the response pressure of the safety valve has not changed by
reassembling the top section in the body.
Lifting device for maintenance
In the case of safety valves with a lifting device it is recommended, and in certain
plant-specific cases even stipulated that the valves from time to time (fig. a) must
be made to blow-off by lifting the seal off the seat, in order to assure the correct
functioning of the safety valve. They can be opened at an operating pressure of
≥ 85
% of the response pressure at the latest.
An examination of the mobility of the safety valves must take place at intervals of at
least 4 weeks in accordance with TRD 601 for steam generators.
Safety valves represent the last point of protection for the silo or installation. They
should be capable of preventing unauthorized excess pressure when all other
upstream regulation, control and monitoring devices fail.
To ensure these functional characteristics safety valves require regular and recur
-
ring maintenance. The maintenance intervals for these fittings are to be specified by
the operator according to the conditions of use.
When using the valve with foods and other delicate goods, the valve should be
regularly checked (e.g. several times per shift) to see whether it has opened or re
-
sponded and the product has flowed out through the valve. In this case, it must be
thoroughly cleaned at the next cleaning interval (see point 6 on cleaning the fitting).
5 Operation/maintenance
6 Cleaning the fitting
To guarantee a consistent hygiene status during the whole operating period of the
valve, cleaning and disinfection work must be carried out within specific time inter
-
vals. The frequency of the work to be carried out is to be specified by the operator
using the hygiene standards and the sensitivity of the products being processed
as well as the operating and environmental conditions and should be integrated
in the specific cleaning and/or disinfection plan for the company. The fitting is to
be cleaned according to methods typical to the industry and with the necessary