Maintenance
2138−1/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
3/ 4
3. Non-return valve
Remark: Always replace screwed union 6 with completely fitted non-return valve
7.
⇒ Oil and tighten screwed union with a torque of 30 Nm.
C
7
6
WCH00661
3.1 Checking a non-return valve
For judging the proper functioning of the non-return valve an opening pressure test
(opening pressure = 5 bar) must be carried out.
During testing the lubricating quill should be kept in horizontal position and an oil
with a viscosity of either SAE 50 at 40_C (approx. 200 cSt) or SAE 30 at 25_C
(approx. 190 cSt) must be used.
3.2 Test procedure
D Instead of screw-in union, fit connection nipple 94934i into screwed union 6.
⇒ Connect and vent the lubricating quill as shown below.
⇒ Vent the lubricating quill.
⇒ Apply a pressure of 2 bar and increase it in steps of 1 bar till the non-return
valve opens.
⇒ Note down the opening pressure.
Remark: The opening (cracking) pressure should be at least 4.25 bar for correct
functioning.
With an opening pressure below 4.25 bar the non-return do not function properly or
it is damaged and must be replaced.
D
5
94935
94931
7
94934h
WCH00417
94934i
001.547/97
6
CLU4−C / 2011-12
Lubricating Quill with Pulse Feed Lubricatio
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