Security valve

steelcityuk · Post by **steelcityuk** » 15 Dec 2006, 15:18

Please could anyone tell me what the valve does? Can't seem to find much out about it.

Thanks.

Steve.

steelcityuk · Post by **steelcityuk** » 15 Dec 2006, 15:23

I've since found this -

http://www.schaalbouw.nl/citroen/dshowsec.htm

I assume Xantias are the same.

Steve.

jeremy · Post by **jeremy** » 15 Dec 2006, 16:12

Yes that's certainly how a BX one works and I'm sure Xantia is the same. Nice device that does its job without fuss and operates the switch without the use of a diaphragm like an engine oil pressure switch and so is less likely to give false messages.

steelcityuk · Post by **steelcityuk** » 15 Dec 2006, 16:34

Thanks Jeremy.

BTW if I can be nosey what do you do? I ask because you seem to read/post during 'office' hours same as I do.

Steve.

slim123 · Post by **slim123** » 15 Dec 2006, 17:40

Also called the priority valve.

Quite a clever little device, in the event of a hydraulic pressure loss, this valve will prioritise the remaining pressure to the front brakes, if needed it will use the front suspension as accumulators to ensure that the brakes are the last to fail.

In other words. If the pump stops, the red light will come on, first loss will be power steering, followed by the suspension dropping, then if all this is ignored! finally the brakes will fail.

It is worth pointing out that the priority / security valve, very rarely goes wrong.

Regards
Slim

steelcityuk · Post by **steelcityuk** » 15 Dec 2006, 17:52

Thanks for the info Slim. I can concentrate on the rest of the hydraulics instead.

Steve.