Hi,
I have experience working in plumbing/piping design using PVC, and I'm happy to help you procure the items you need.
A few questions that I have before I can help you are:
1) Is there a specific pressure piping standard that you are working to? I'm guessing the system is a vacuum system hence piping normally have to comply to a piping standard (we use AS/NZS 1477 in Australia)
2) What is the preferred piping connection? Threaded, solvent weld joints?
3) What size do you need for the valve? 1" or 1 1/2"?
4) For the electronic timer, do you need any output signal from it (i.e. 4-20mA)? Also what power supply do you have available for this timer? Normally for an item this small you would have it loop powered with 24VDC.
Feel free to discuss with me. I have experience working with engineering design/procurement as well as dealing with vacuum drainage systems.
Regards,
Kenny