Problem accumulation drip irrigation to existing sprinkler system? I am a newbie and am trying to add a drip...

I am a newbie and am trying to add a drip system onto an existing sprinkler system that waters my prairie. This system has an senseless antisiphon valve and the plan is to use it. I walk to the home depot and got a Y-filter, pressure regulator, 3/4" to 1/2 swivel connector and 1/2 inch tubing.
Now the anti-siphon stopcock is only a couple inches above the ground. And if I connect the above 3 components together it is in the order of 9-10 inches long, am I supposed to dig up a foot or more below the anti-siphon first to get this hooked up?
(I already did that but something tell me I might be wrong.)

Do I need to apply PVC cement sort of stuff when screwing within various components? (They seem to be to leak otherwise no thing how tight I twist them. Esp the integrated between Y-filter and pressure regulator and the joint between pressure regulator to the swivel connector)

Thanks so much!
Vivek
Answers:    i would put it beneath ground past the antisiphon spigot so nothing will disrupt it being above ground.
antisiphon valve need to be above ground themselves though.
for adjectives of your threaded fittings use teflon paste or video to seal it.
ive found that teflon blend works the best though.

and for all slip fittings use regular PVC epoxy resin.
you can use the purple primer first, but its not neccesary.

i dont really do drip irrigation all that much,
but we dont use antisiphon valve around where i work. i uncommonly see them,
but they are more often than not put surrounded by above ground.
all or our drip stuff, similar to the pressure reducer, is installed below the ground ussually in tap boxes.

good luck though and hope this help.
Anti-siphon valves (ASVs) should be going on for 12" above your highest drip, microspray, or sprinkler nozzle surrounded by order to work properly. If your drip emitters or microspray nozzles are above the ASV, later a reverse pressure differential could cause sea to flow back into your house through your drip strip. This happens especially when for some idea the water to your house is shut rotten and its pressure drops. However, even if this happened, plausible you would not have a great potential strength threat from water stained with fertilizer surrounded by it seeping stern into your drip system and back into your house wet. You nevertheless need to be aware of this.

Do not paste threaded parts! I use teflon tape and largely make several wraps. Make sure you don't crossthread any components, if not you'll likely enjoy to replace them.

And... if this was one of my installations this is what I would do:

1. As repulsive as they are, I'd move the ASV up ten more inches so that I could rest better at night.
2. I would run 3/4" pvc from the ASV spout straight down to an elbow in the ground.
3. I would consequently run a short, or long, length of 3/4" pvc to someplace where I would want and could access a 10" round stopcock box containing the filter and regulator.
3. The pvc would adapt over to the filter/regulator assembly's and the 1/2" poly tubing, as you know, would come bad the output, and the whole enchilada would be covered by the stopcock box.

Mounting the components neatly contained by an in-ground valve box doesn't trademark things work better, but it does make things look neater.