Richter NKP Series Butterfly Valves - Manual (Page 5)

Series NKL, NKLP, NKS, NKSP, NK, NKP
Page 5
9520-070-en Revision 04
TM 7113 Edition 05/2008
1.3 Tightening torques
All screws greased, tighten in diametrically
opposite sequence!
After the plant has been started up (especially with the
first temperature load) the tightening torques must be
checked and the correct value set again.
The tightening torques for pipe screws and body
screws mentioned must not be exceeded. For an ex-
ception, see Section 8, flange connection valve/pipe
is leaking.
The following tightening torques are recommended:
Packing screws
Screws Tightening torque
[ISO/DIN] [Nm] [in-lbs]
2 x M8 3 27
Pipe screws, flanges to ISO/DIN
Flange
nom. size
Screws Tightening
torque
[mm] [ISO/DIN] [Nm]
50 4 x M16 30
80 8 x M16 25
100 8 x M16 30
150 8 x M20 55
200 8 x M20 75
250 12 x M20 65
300 12 x M20 75
350 16 x M20 75
400 16 x M24 85
Pipe screws flanges ISO/DIN drilled to ASME Class
150
Flange nom. size Screws Tightening tor-
que
[mm] [inch] [ASME] [Nm] [in-lbs]
50 2“ 4 x M“ 30 266
80 3“ 4 x M“ 50 442
100 4“ 8 x M“ 30 266
150 6“ 8 x ¾“ 55 487
200 8“ 8 x ¾“ 75 664
250 10“ 12 x 7/8“ 65 575
300 12“ 12 x 7/8“ 75 664
350 14“ 12 x 1“ 75 664
400 16“ 16 x 1“ 85 752
Body screws
Hex. Nut 920/2 for lug-style body
Nom. size Hex. nuts
Tightening
torque
[mm] [inch] [ISO/DIN] [mm] [inch]
50 2“ 4 x M10 30 266
80 3“ 4x M12 50 442
100 4“ 4 x M12 50 442
150 6“ 4 x M16 100 885
200 8“ 4 x M16 100 885
250 10“ 4 x M16 100 885
300 12“ 4 x M20 200 1770
350 14“ 8 x M16 100 885
400 16“ 8 x M20 200 1170
Hex. socket screw 914/1 for sandwich body
Nom. size
Hex. socket
screw
Tightening
torque
[mm] [inch] [ISO/DIN] [mm] [inch]
50 2“ 2 x M10 30 266
80 3“ 2 x M12 50 442
100 4“ 2 x M12 50 442
150 6“ 2 x M16 100 885
200 8“ 2 x M16 100 885
250 10“ 2 x M16 100 885
300 12“ 2 x M20 200 1770
350 14“ 4 x M16 100 885
400 16“ 4 x M16 100 885
Hex. socket screw 914/1 for double-flange body
Nom. size
Hex. socket
screw
Tightening
torque
[mm] [inch] [ISO/DIN] [mm] [inch]
50 2“ 2 x M10 30 266
80 3“ 2 x M10 30 266
100 4“ 2 x M10 30 266
150 6“ 2 x M12 50 442
200 8“ 2 x M12 50 442
250 10“ 2 x M12 50 442
300 12“ 2 x M12 50 442