Richter GU/F Series, Installation And Operating Manual

Page: 4 / 28

Series GU/F
Page
4
9530-020-en Revision 15
TM 10477 Edition 05/2022
Example plate test pressure
Body identification :
The following are visible on the body according to DIN
EN 19 and AD 2000 A4:
♦
Nominal size
♦
Rated pressure
♦
Body material
♦
Manufacturer's identification
♦
Melt number/Foundry identification
♦
Foundry date
♦
Arrow for direction of flow
1.2 Component identification
Certified overflow valve GU DN 25 are identified with
a certification plate to the German data sheet A2 (on
pressure vessels). This stainless steel plate is riveted
to the valve body.
It contains the following details for example:
TÜV = TÜV symbol
SV = Safety valve
07 = Year of certification (here: 2007)
993 = Certification number (here: 993)
d0 = Narrowest flow Ø in mm (here: 22)
F = intended for discharging liquids
α
w = Certified coefficient of discharge (here: 0.40)
p = Test pressure in bar (here: 6.0)
1.3 Tightening torques
All screws greased, tighten in diametrically
opposite sequence!
The tightening torques for pipe screws and body
screws mentioned must not be exceeded. For an
exception, see
Section 8 , Flange connection valve /
pipe is leaking.
The following tightening torques are recommended.
Pipe screws , flanges to ISO/DIN
Flange
Nominal size
screws Tightening torque
[mm] [ISO/DIN] [Nm] [in-lbs]
25 4 x M12 10 90
40 4 x M16 20 175
50 4 x M16 26 230
65 4 x M16 40 355
80 8 x M16 25 220
Pipe screws
flanges to ASME Class 150 or flanges ISO/DIN drilled
to ASME Class 150
Flange
Nominal size
screws Tightening torque
[mm] [inch] [ASME] [Nm] [in-lbs]
25
1“ 4 x ½“
8 70
40
1½“
4 x
⅝“
15 135
50
2“
4 x
⅝“
25 220
65 --- 4 x
⅝“
30 265
80
3“
4 x
⅝“
45 400
Pipe screws
flanges to ASME Class 300
Flange
Nominal size
screws Tightening torque
[mm] [inch] [ASME] [Nm] [in-lbs]
25 1 4 x
⅝“
15 133
40 1½ 4 x ¾
“
25 221
50 2 8 x
⅝“
15 133
Cover screws ISO/DIN
Flange
Nominal size
screws Tightening torque
[mm] [inch] [ISO/DIN] [Nm] [in-lbs]
25
1“
4 x M10 50 442
40
1½“
4 x M12 50 442
65 --- 4 x M12 50 442
50
2“
4 x M12 50 442
80
3“
8 x M12 50 442
Cover screws ASME
Flange
Nominal size
screws Tightening torque
[mm] [inch] [ASME] [Nm] [in-lbs]
25
1“ 4 x ½“
50 442
40
1½“ 4 x ½“
50 442
50
2“ 4 x ½“
50 442
80
3“ 8 x ½“
50 442