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The small connectors running between the left and right sides set the pressure. The input is 10 (psi or whatever) and you have to change that to fit the door you are trying to open. For Sully's door, the output has to be 5, for the bridge 16, and for the Living Quarters 7. That means that the "total change" for all of the connectors has to modify the input by that amount.
Sully's door -- total change on the bottom meter is -5
Bridge control -- total change on the bottom meter is +6
Living Quarters -- total change on the bottom meter is -3
You change the total by rotating the valve connectors to include or exclude connectors from the path. For example, you need more "negative" valves for Sully or the Living Quarters, and more "positive" values (most of the +2) to bring the pressure up for the Bridge. You can practice rotating the pipes, but try to work from left to right to avoid having a disconnected (open) path. Once you see how the rotation of one pipe changes the pressure, you can revert it, or continue to make other changes down the line, moving up or down from the central pathway. When you have the right total change (-5, +6, or -3), press the steam release at upper left, or close to start over.
What else can I help you with?
Where is the ghost on steamworks island?
its in the museum on mainstreet of steamworks island :)
What is the 14th poptropica island's name?
It's Steamworks Island #14th Island
How do you defeat Steamworks Island?
(The solution is at the related question "How do you beat Steamworks Island")
Where is the crab in steamworks island on poptropica?
the crab on steamworks island is next to the living quarters
Where is the ghost on Steamworks Island for Ghost Story Island at?
You go to Steamworks and head to the museum and there is the Deogen
What is the biggest island in poptropica?
steamworks island
How do you beat steamworks island on video?
There is a video walkthrough at the related link below. There are written WikiAnswers solutions at the related questions, as there are for all Poptropica islands. (How do you beat Steamworks Island) (What is the walkthrough for Steamworks Island)
What will the 14th island on poptropica be called?
Steamworks island
Where is the old vine on steamworks?
you can get it on the far left of steamworks island, past the living headquarters.
How do you beat the Bridge terminal in steamworks Poptropica?
how to do the bridge terminal on poptropica's steamworks island
How do you get to the roof on Steamworks Island?
jump
How do you go on steamworks island?
The island opened to general use on September 9, 2010, concurrent with a new island map. Steamworks Island will normally be in the center or bottom center of the map.
