True bypass heater valve?

[smash]

Anyone know where I might source a compact true bypass valve for a heater matrix? I don't want just a cut off but a bypass - many thanks!

[GreenV8S]

Isn't that basically the same thing, i.e. basically a tap? If you fit it in series with the heater matrix it's a cut-off; if you fit it in parallel it's a bypass. I hope you aren't using the heater circuit as your only engine bypass? Typically that will only flow a fraction of what you want.

[smash]

No it's not - if you put a tap in parallel the matrix is still in the loop albeit higher resistence - I can do this but it's my last resort. I have a true bypass here i.e. 4 ports and it truly bypasses e.g. shuts out the heater matrix but it's way too big to get in where I need it.

[GreenV8S]

The distinction doesn't seem important if the bypass is adequately sized, but if you really do want a changeover valve is this the sort of thing you're looking for?

https://www.caterhamparts.co.uk/product_info.php?p...

By the way, why is it that you want to bypass the heater rather than just switch that circuit off?

[simon3000]

you could try the type fitted to the ford focus and transit.there solenoid operated and relatively compact.i picked one up on ebay a while back for around a tenner

[Snake the Sniper]

Would some type of T valve work, ie one way leads to the bypass and one to the heater. Then just have an open T at the other end with the bypass and heater outlets going to it?