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I don't know for sure but from my limited understanding if there isn't a secondary pump fitted to the transmission then I wouldn't be surprised if this valve wasn't fitted. Like I say I'm not 100% sure about this but I guess the "non return valve for the primary pump" is only used when the transmission is being powered by the secondary pump (under tow start conditions).
If, however, you have a secondary pump my guess is that you'll never tow start the sucker with out that valve as the hydraulic pressure made at the less powerful secondary pump will bugger off via the primary pump and probably off into the ether...
...please note - I'll say it again - I'm not 100% sure about this - I reckon I'm about 65% sure about it so long as you don't have a secondary pump!
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