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Assembly
Bosch Rexroth AG, DB20K.1X/...E, RE 25818-B/11.21
7.6 Assembly
Insufficient design of the housing for the mounting cavity!
The safe pressure relief function does no longer work if material and dimensions of
the housing have been incorrectly designed for the mounting cavity.
Material and dimensions of the housing for the mounting cavity are to be
f
selected so that sufficient safety is provided for all imaginable operating
conditions. This for example applies to pressure resistance, resistance to
stripping of the threads and the tightening torque.
1.
Remove the transport protection cap from the safety valve. Remove the
individual seal ring or the two seal rings supplied in the transport protection
cap.
2.
If there are two seal rings provided with the safety valve, clamp the smaller seal
ring in the bigger one.
3.
Insert the seal ring or the seal ring combination into the mounting cavity; ensure
that the position in the mounting cavity is as concentric as possible and that the
entire surface is in contact.
4.
Screw in the safety valve and tighten it applying the tightening torque specified in
table 9.
Table 9: Tightening torques
Pressure
ratings
up to 60 bar
50 Nm +5 Nm
up to 110 bar
50 Nm +5 Nm
up to 210 bar
50 Nm +5 Nm
up to 350 bar
50 Nm +5 Nm
1)
Lubricated screws; tighten using a manual torque wrench with an accuracy of ± 10%
The specified tightening torques were calculated with the frictional value µ
the thread. For tightening, a manual torque wrench with a tolerance of ≤10% is to be
used. The tightening torques are to be corrected according to the relevant material
pairing of safety valve and valve block. Steel is to be assumed as valve material in
this case.
Secure safety valves against unauthorized removal from the mounting cavity by
wire or seal. A bore is already provided for this in the valve hexagon.
WARNING
1)
Valve type
Component marking
DB20K.1X/...E
1001
= 0.12 in
G
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