In my humble opinion you don't need a one way valve as this is disguising the problem which is that air is getting into the system from your leak off pipes, you only need a small crack in one of the pipes for air in the system to allow the diesel to run back down the pipes. It is a bit like putting a straw in your drink, if you keep your finger on the top of the straw no drink will run out when you lift it out of the drink, if you remove your finger to allow air into the top of the tube then the drink will run back out.
I had this problem on my car and allthough the pipes looked ok once I came to change them they were rock hard and cracking on the ends and some of the fabric covering was diesely and dirty meaning there were some leaks. When the engine is running you may get a very small weep of diesel out of the pipes which will gather around the base of the injector and when the engine is stopped this will allow the air into the system and the diesel will flow back gradually with the resultant cranking over and over for long enough to pull the diesel back up. Fit new pipes regardless, it's a 30 minute job and will only cost between £5 and £10 for the pipe.
If you aren't sure what I am on about, standing at the front of the car you will see a plastic cover that runs front to back along the centre of the motor held on with three allen screws, remove the screws and slide the cover out forwards. You can now see the injectors and you will see a series of rubber or fabric covered rubber pipes that link each injector to the next and then from the front one back to the pump. These pipes just pull off and can then be replaced. You will probably have some difficulty getting them off as they will have probably gone hard.
Change these pipes before you spend any money on anything else as this is the cheapest place to start and makes a dramatic difference.
I hope this helps.