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There should be a drain valve where you can hook up a hose and then open the valve to drain.
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To open the valve on an oxygen cylinder, you turn the valve.
Check the EGR valve. It sounds like your EGR valve is staying open. An EGR valve that is open at idle will cause a car to stall. An EGR should be closed at idle and open when you are driving around.
No, sprinklers in a deluge system are "open"; no valve in the sprinkler, and an automatic valve turns on the water to all open sprinklers when a fire condition is detected.
All the way. It may be dangerous to throttle your gas flow down using the tank valve.
If you measure "the applied voltage" (typically, 24 volts) across the coil of the main gas valve, and the valve refuses to open, it will need to be replaced. Before you do, double-check that gas is getting to the valve.The HVAC Veteran
Yes, you should, it helps air get in to flush more quickly.
the amount of valve open after T.D.C and B.D.C.
It's the part that actually pushes a valve to open it.
When the handle is in line with the pipe, the valve is open.
There is no valve, it is probably clogged up.