Pneumatics Subsystem

Question 1

What is the storage of the O2 and dil bottles?

Answer 1

• 21 cubic feet
• 3,000 psi

Question 2

Charging rate for the O2 and dil bottles?

Answer 2

100 dry and 200 wet

Question 3

What does the regulator reduce the high pressure bottles down to?

Answer 3

230 - 270 psig

Question 4

How many microns is the inline filter?

Answer 4

60

Question 5

What is the shape of the oxygen and dil bypass valves

Answer 5

O2 - concave
Dil - Convex

Question 6

How much gas is added using the bypass valves?

Answer 6

50 lpm

Question 7

What are all tubing connectors designed/rated for?

Answer 7

High pressure use

Question 8

What are the O2 and dil bottles made of?

Answer 8

Inconel 718

Question 9

Explain the pathway of O2 to the breathing loop:

Answer 9

• 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

Question 10

How does the diluent addition valve operate?

Answer 10

• mechanically activated by the top of the diaphragm dump valve which comes in contact with the diluent addition valve

Question 11

How does the diaphragm dump valve work?

Answer 11

• When the diaphragm expands past a certain point it comes in contact with the lower housing assembly