Richter LPV/F Series Low-Pressure Safety Valves - Manual (Page 14)

Series LPV-A/F, LPV-D/F
Seite 14
9530-060-en Revision 01
TM 7464 Edition 02/2009
Only LPV-D/F DN 50: Attach the centering ring
549 onto the body centering.
Insert guide of the bonnet into the plug and place
on the flange.
First tighten the attachment nuts 920/2 hand-tight
and then with a torque wrench evenly and in
diametrically opposite sequence.
It is imperative to observe the prescribed
torques for the connection body / bonnet!
See Section 1.4.
9.6 Tests
Following the assembly of the valve, the
stroke and the test pressure must be
checked
. See also Section 7.4.
9.6.1 Stroke
Only LPV-A/F: Using a depth gauge through the inlet
nozzle, measure the distance in the centre between
the plug and the sealing strip on the flange both in
the closed and fully opened state.
The valve stroke is derived from the difference
between the two dimensions. See Section 10.2.
Only LPV-D/F: Valve stroke is determined from the
dimensions in Section 10.2.
9.6.2 Test pressure
This test should take place on a test bench with a
neutral medium such as air or 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 Supervisory 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 test the test gauge pressure, the pressure is
slowly increased in the valve inlet until the valve
starts 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
112 bonnet
122 inlet nozzle
204 plug
205 seat
237 lifting aid
239 weight
522 round cord
544 support ring
549 centering ring
801 guide
901/1 hex. screw
902/x stud screw
920/x hex. nut
920/3 hex. nut, thin
935/1 lead seal
936/x tooth lock washer
938/1 hex. head screw plug