Richter NKP Series Butterfly Valves - Manual (Page 15)

Series NKL, NKLP, NKS, NKSP, NK, NKP
Page 15
9520-070-en Revision 04
TM 7113 Edition 05/2008
9.3.3 Proximity switch
The proximity switch reliably indicates the closed posi-
tion of the valve disc. The signal penetrates the thick-
walled lining.
9.4 Tests
Following tests would be done after the assembly.
Measurement of the breakaway torque
The breakaway torque required for opening and clo-
sing the valve is to be ascertained. The maximum
torque should not exceed the values given in Section
1.8.
Tightness of valve opening and shaft bushing
The completed valves have to undergo a „leak test of
the closure with air“.
The tightness of the shaft bushing (stuffing box) of
each valve is tested. The holding time begins once the
residual air has escaped from the stuffing box cham-
ber.
Tightness is verified according to DIN EN 12266-1
respectively MSS SP-67.
For detailed installation and inspection regulations see
QM No. 0910-08-1005, available from Richter on re-
quest.
10 Drawings
10.1 Legend
120 shell
221 disc/stem unit
229 guide pin
(up to. DN 150 / 6“ inclusive)
235 lever assembly
300 plain bearing
400/1 o-ring
402/1 packing ring
405 thrust ring
409 body lining
412 pressure gasket
413 sealing foil
503 spring gland follower
507 support
510 bracket
517 scraper ring
518 cup spring assembly
519 throttling plate
521 flexible inlay
532 grounding grope
550 disc
804 coupling
850 actuator
857 warm gear
901/x hex. screw
914/1 hex. socket screw
918/1 threaded rod
920/x hex. nut
936/1 toothed lock washer
980/x round head grooved pin
10.2 Safety stuffing box (Option)