To open and close at the proper time to allow air/fuel mix to enter cylinder and for spent air/fuel mix to exhaust the cylinder.
filtering
As an air/fuel mixture is drawn into the intake ports, intake valves open to allow the mixture to enter the cylinder. On the exhaust stroke of an engine, the exhaust valves open, allowing the burned air/fuel mixture to exit out the exhaust ports. Intake valves are larger than exhaust valves, and are able to be found on the "cold" or intake side of the cylinder head(s).
TO open and close so that we can make it complete
yes according to whether in storm port will close
By May of 1862, the Union had not yet been able to close the ports of Charleston, Wilmington, Galveston, and Mobile.
Open/close intake & exhaust ports. let in fuel. let out gases after combustion.
Port Filtering
Port Filtering
port filtering
No, the slave cylinder is a typical hydraulic piston; if the system was 'opened' then the fluid would come out.
It is best to close the master cylinder during bleeding.