Richter GUT/F Series Overflow Valves - Manual (Page 13)

Series GUT/F
Page 13
9530-071-en Revision 10
TM 8361 Edition 10/2011
9.7 Tests
Following the assembly of the valve, the stroke and
the test pressure must be checked.
9.7.1 Stroke
Lift check:
The measurement can be made with a slide calliper
gauge and a depth indicator to DIN 862.
The lift is derived from the difference in the two
heights. It must be at least as high as the lift given in
the test certificate.
9.7.2 Test pressure
This test should take place on a test bench with a
neutral medium such water. Regarding their suitability
and precision, the pressure gauges must conform to
the requirements of current national regulations (in
Germany: e.g. VdTÜV data sheet "Safety Valve 100"
of the Association of the German Technical Supervi-
sory Boards).
All pressure tests should be carried out in
compliance with DIN EN 12266-1 or API 527.
It is recommended to perform a bubble test with a
5 mm diameter hose positioned 5 mm below the
surface of water. The other end of the hose is
sealed to the outlet of the valve by means of a
stopper.
To check the test pressure, the pressure in the
valve inlet is slowly increased until the valve com-
mences to open.
To check the reseating pressure, the pressure in
the valve inlet is slowly decreased until the valve is
bubble-tight.
10 Drawings
10.1 Legend
100 body
105 cover flange
204 plug
205 seat
206 bellows
207 cap
307/1 guide bush
308 insert sleeve
400/1 O-ring
509/1 groove nut
537 lower spring plate
581 straining screw
800 valve stem
901/1 hex. screw
920/1 hex. nut
935/1 lead seal
936/x tooth lock washer
939/x spring-type pin
952/1 pressure spring