To see a valve in your dream, suggests that you need to keep your cool especially when under pressure. Remain calm and don*t panic.
Being in charge of permission or boundaries (as a valve is what allows or disallows fluid to pass through or not)
Regulation of flow, such as of time or of a process
Control of flow, including stopping, starting, or regulating how fast something is allowed to proceed
Consider also the context, role, and condition of the valve. For example, a steam exhaust valve might represent control over one's anger, while a broken valve might represent someone who is ineffectively managing a process.