MA-005 - Minitrans Installation Manual - Rev 4.5
13-Aug-20
Page 27 of 86
Figure 8-8: Bleed assembly on flange-type oil return valve
▪
If a flange-type valve is to be used to return the oil and the flange is drilled and tapped
to a ¼ in. female NPT fitting, then the drilled hole should be offset to the top of the
internal valve diameter to prevent an air pocket from being trapped behind the flange
(see Figure 8-9).
Figure 8-9: Flange example
Figure 8-10 depicts the Return Assembly kit.
Figure 8-10: Return Assembly kit
Check Valve
Bleed Port
(must be oriented upwards)
Bolt holes
Inside valve diameter
behind the flange
¼ in. NPT return
port
Check valve
–
the arrow
must point
toward the
transformer.
Elbow is
only used if
the ¼ in.
female NPT
fitting face is
vertical; it is
not used if
the ¼ in.
female NPT
fitting face is
horizontal.
