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Te foot valve is also a non-return valve which ensures that there is always fluid in the pipe line when the pump is started.
Te oil system of a motor car has a non-return foot valve protected by a mesh sieve in the oil sump.
Exercise 6.1
1. Give three reasons why we need valves in pipe lines. 2. Under what conditions are safety valves amust? 3. Give an example of where a gate valve might be found. 4. What is the main function of a non-return valve? 5. Briefly describe the operation of a safety valve.