Installation, Operating & Maintenance Instructions
Series 612 DN 250 (I.D. 10”), EtherCAT
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 [email protected] www.vatvalve.com
282408EB
2012-04-23
10/81
2.3 Tightening torque
Note:
The torque values below are dependent on many factors, such as materials involved, surface quality, surface treatment,
and lubrication.
The torques below are valid if immersion depth of the mounting screws is at least once the thread diameter (min. 1d), and
the friction coefficient of the screw-flange connection (
total
= (
screw thread-helicoil
+
under screw head
)/2) is bigger than 0.12. Lower
friction coefficients may damage the valve, as the resulting preload force gets too high. Therefore for other friction
coefficients the torque needs to be adapted. Please review design guidelines for Helicoil-Screw connections and make sure
that screws in use are capable to withstand applied torques, are appropriate for the application and are not too long. Too
long screws may damage the valve, the immersion depth should not exceed (hole depth
– 1 mm).
Tighten mounting screws of the flanges uniformly in crosswise order. Observe the maximum torque levels in the following
tables.
2.3.1 Mounting with centering rings
ISO-F
ISO-F
max. tightening torque
(Nm)
max. tightening torque
(lbs . ft)
17
– 20
13
– 15
hole depth (mm)
hole depth (inch)
See dimensional drawing
See dimensional drawing
Refer to «Spare parts / Accessories» for centering rings ordering numbers.
2.3.2 Mounting with O-ring in grooves
ISO-F
JIS
ASA-LP
ISO-F
JIS
ASA-LP
max. tightening torque
(Nm)
max. tightening torque
(lbs . ft)
35-40
65-70
80-90
26-30
48-52
59-67
hole depth (mm)
hole depth (inch)
See dimensional drawing
See dimensional drawing
