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Why would it need a valve. You are just routing the breather cap to the air cleaner instead of venting to atmosphere. You would only need a valve if it was routed to the intake manifold, which the later smog systems did.
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Did you read the REFERRING URL I posted?
Take a 2nd look at the photo(s). Direct manifold vacuum is supplied to the canister housing. It is a PCV SYSTEM.
By drawing fresh outside air through the ACL makes it a CLOSED PCV SYSTEM, whereas no fumes can vent/escape to the atmosphere unlike an OPEN SYSTEM that uses a filtered oil fill cap for outside air filtration.
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- MULTI-VEHICLE SYNTHETIC TRANSMISSION FLUID -
Multi-vehicle transmission fluids are becoming more and more popular in the marketplace. Oil marketers design these fluids for a wide range of automatic transmission types. While they are not licensed by any specific auto manufacturer ... ??? ... enough said ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order)