Pneumatics Subsystem Flashcards
1
Q
What is the storage of the O2 and dil bottles?
A
- 21 cubic feet
- 3,000 psi
2
Q
Charging rate for the O2 and dil bottles?
A
100 dry and 200 wet
3
Q
What does the regulator reduce the high pressure bottles down to?
A
230 - 270 psig
4
Q
How many microns is the inline filter?
A
60
5
Q
What is the shape of the oxygen and dil bypass valves
A
O2 - concave
Dil - Convex
6
Q
How much gas is added using the bypass valves?
A
50 lpm
7
Q
What are all tubing connectors designed/rated for?
A
High pressure use
8
Q
What are the O2 and dil bottles made of?
A
Inconel 718
9
Q
Explain the pathway of O2 to the breathing loop:
A
- O2 leaves the high pressure bottle that can be charged up to 3,000 psig
- O2 leaves the bottle as it passes thru the regulator that reduces pressure to 230-270 psig
- O2 then goes thru an inline filter to a “t” fitting
- One end of the T fitting, the O2 travels to the O2 addition valve
- Once an electrical signal is sent from the PEA to the O2 addition valve, the peizeolectric crystal deforms allowing O2 to flow at 5 SLPM into the scrubber assembly thru a check valve that prevents moisture from coming back into the pneumatic system
- On the other end of the “t” fitting, O2 flows to the O2 addition valve
10
Q
How does the diluent addition valve operate?
A
- mechanically activated by the top of the diaphragm dump valve which comes in contact with the diluent addition valve
11
Q
How does the diaphragm dump valve work?
A
- When the diaphragm expands past a certain point it comes in contact with the lower housing assembly
