Richter GU/F Series Overflow Valves - Manual (Page 4)

Series GU/F
Page 4
9530-070-en Revision 00
TM 6908 Edition 10/2007
Body identification:
The shell bears the following information in
accordance with DIN EN 19 and AD 2000, A4:
nominal diameter
nominal pressure
shell material
manufacturer's identification
charge number/foundry identification
Cast 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)
871 = Certification number (here: 993)
d
0
= Narrowest flow Ø in mm (here: 22)
D/G = intended for discharging vapours/gases
F
= intended for discharging liquids
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 nom.
diameter
Screws Torque
[mm] [ISO/DIN] [Nm] [in-lbs]
25 4 x M12 10 90
50 4 x M16 20 175
40 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
to ISO/DIN, drilled to ASME Class 150
Flange nom.
diameter
Screws Torque
[mm] [inch] [ASME] [Nm] [in-lbs]
25 1" 4 x ½“ 8 70
40 1½" 4 x R“ 15 135
50 2" 4 x R“ 25 220
65 --- 4 x R“ 30 265
80 3" 8 x R“ 45 400
Pipe screws, flanges to ASME Class 300
Flange nom.
diameter
Screws Torque
[mm] [inch] [ASME] [Nm] [in-lbs]
25 1 4 x R“ 15 133
40 1½ 4 x ¾“ 25 221
50 2 8 x R“ 15 133
Cover crews DIN/ISO
Flange nom.
diameter
Screws Torque
[mm] [inch] [ISO/DIN] [Nm] [inch-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 nom.
diameter
Screws Torque
[mm] [inch] [ASME] [Nm] [inch-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
Hex. socket screws 914/1 of the bellows seal
Nom. size Screws Torque
[Nm] [in-lbs]
25 4 x M8 10 89
40 4 x M8 12 106
50 4 x M8 12 106
65 4 x M8 12 106
80 4 x M8 12 106