Ummm well I think I might ask PD if I was you

its probably simpler.
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Here is some instructions from me and you know I can't tell a short story.
I would mostly have it 3/4 full I think I have an 11 pint.
WARNING - BE VERY CAREFUL WHEN YOU TAKE THE LID OFF - I TAKE THE LOT OVER TO THE SINK AND PUT HALF THE LID UNDER COLD WATER - IT WILL HISS AND MIGHT STEAM - TRY ROCKING THE VALVE AND KEEP UP THE HOT WATER UNTIL YOU CAN MOVE IT WITHOUT ANY STEAM COMING OUT. TAKE OFF THE VALVE AND THEN THE LID - WHEN YOU BREAK THE SEAL OF THE LID STILL BE CAREFUL OF THE STEAM - ITS VERY VERY HOT
For Corn Beef:
As big a piece of meat as I think will fit in it (from which I wash off all the gunk first). Couple carrots, stalk or two of celery including leaves, onion, say tablespoon peppercorns, bay leaves, whole medium potatoes, slurp vinegar, tablespoon brown sugar. I fill it up to about 3/4 of the meat with water.
I put the lid on and the heat up high till steam starts to come from the hole in the middle of the lid.
Then I pop the pressure VALVE on the top and wait till it starts to spin. This can take a couple of minutes in a big full cooker.
Then I turn down the heat till it just rocks gently.
I like my meat falling apart so I usually keep on cooking it for 2 hours and then let it cool in the water etc. We usually eat the vegies that were cooked with it.
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Shanks I probably buy 6-8 (they are frenched and small not like the huge ones someone had a picture of) brown them in some oil in the bottom of the pressure cooker take them out.
Then brown onions, celery, carrots, swedes, potatoes, all cut smallish, couple of teaspons of mixed italian or other dried herbs.
Put the shanks back, add a large tin of crushed tomatoes, glass of red wine, probably litre of chicken stock, splash of soy, worchester sauce. Usuall ends up again about 3/4 full.
Do exactly the same as above (around 2 hours). If I want some greens I throw frozen ones in at the end and the cook enough for me in the heat.
This is exceedingly hot.
Of course if you like garlic I would add it to both the above.
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Here are the times on my lid - no sizes given.
Vegetable soup 20 Minutes
Plum pudding 60
Braised steak 20
Cup Custard 4
Corned Beef 45
Boiler Fowl 30
Beef Stew 15
Potatoes 8
Beans & Peas 3
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Have a look here for some ideas.
http://www.underpressure.com.au/web-content/Pages/Recipes/Home_Page_Recipes.html