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There are valves in the head of the motor. They open to let in air and exhaust out. There is a spring around each one that keeps them closed until the camshaft forces the valve open. Edit: Another way to put it is that the valve spring's job is to close the valve once it's opened by the valve train. The stronger the spring, the quicker it closes the valve and the higher the RPM the engine can operate without 'floating' the valves. The tradeoff is that the stronger the spring, the harder it slams the valve against the seat, reducing each's useful lifetime.
The valve springs.
It keeps the anus closed
It closes and keeps the VALVES shut when needed.
The seals sit in the head of the motor. Each cylinder has 4 valves, 2 intake and 2 output valves, each valve has a semi rubber/metal seal that keeps oil from leaking into the combustion chamber. Replacing the seals requires removing the head from the motorblock.
Valves
Valves
The exhaust system is what muffles the engine sound keeps the fumes out of vehicle and away from the vehicles occupants and also filters the exhaust fumes out.
Pressure There are also one way valves in the circulatory system.
There is a spring on the fuel door hinge that keeps the fuel door closed. I hope this info helps.
closed off
These are valves, and are found in veins to prevent blood from flowing backwards.