Figure 10-8.--Toggle valve assembly.
Then lift the valve disc away from the valve seat. Try to
The three toggle valves in this system are the
converter vent line shutoff valve (GV-4), the transfer
avoid tilting the valve on removal, as the stem may
tank vent line (GV-3), and the transfer tank fill line
become disengaged from the valve plug.
shutoff valve (LV-2). All three of the toggle valves
Inspect the valve disc at the end of the stem, as it
function in the same way and have the same part
may only be necessary to replace that part. If, however,
number, although one transfers liquid and the other
you have to replace the entire toggle valve assembly,
two are used for gaseous vent control.
remember that all parts must be cleaned to the standard
required for use in oxygen systems, as specified in
MIL-C-52211. Follow the current technical manual for
Before removing a toggle valve, make sure that
your type of LOX cart.
there is no LOX in the unit and that the tank has
warmed to ambient temperature.
After replacing a valve, check it for both internal
and external leaking.
R E L I E F VA LV E S A N D R U P T U R E
All three valves are normally kept in the closed
DISCS.--Relief valves (RV) and rupture discs (SD),
position. To open a valve, lift up on the handle. Then
as shown in figure 10-9, are safety devices that protect
remove the toggle valve assembly from the tank
assembly by removing the bonnet nut (shown in fig.
the system from excessive internal pressure that could
destroy the LOX cart tanks and plumbing system.
More important, they also protect the operator and
When removing toggle valve 104235, lift it
straight up and place your hand under the valve disc.