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safety valve


coyote26
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hi friends we have some problems with the preurization system,and one question came to me, any body know what is the normal time to close complety for the safety valve,when i change de master swicht from air conditioning NO PRESS to MAN PRESS or AUTO PRESS???

in our plane its takes more tha 2 minutes,is this right???

THANKS YOU A LOT!!!!!!!!!!!!!!

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Not good... Not so much a time limit to quote but the valve is spring loaded closed so as soon as the "pressures" are equal the springs win and closes the valve... After the high pressure bleed air is removed the valve should close rather fast. If it slowly closes you may have a clogged air filter on the actuator side. When clogged it will act as a check valve and resist the spring (not let air in) and cause it to be slow.... the fact that it does close tells me the springs are good and air is slowly refilling the actuator side of the valve its slow due to the clogged vent filter.....clean it and see what happens.

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I agree with NATOPS1. I had a safety valve problem on an E model and I had to flip it closed after take off. It was a clogged filter causing the problem. I reckon that's one of the reasons the FE is supposed to close the bleed air vlaves before a dirt field landing (wasn't me).

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