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The feed system pressures in the ASI were chosen to be a "good bit" higher than the chamber pressure to mitigate backflow of gas in the main combustion chamber into the ASI lines. This is almost a non issue because the solenoids are almost guaranteed to close after the ASI burn time, but it's a good practice to have. Our oxidizer reg pressure is currently at 400 psi, and our fuel reg pressure is currently at 550 psi. Our main chamber pressure is 350 psi.
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