Q1. Select suitable valve types for the following applications: 1. Isolating a heat exchanger; 2. Manual control of the water flow into a tank used for making up batches of sodium hydroxide solution; 3. The valves need to isolate a pump and provide emergency manual control on a bypass loop; 4. Isolation valves in the line from a vacuum column to the steam ejectors producing the vacuum; 5. Valves in a line where cleanliness and hygiene are an essential requirement. State the criterion used in the selection for each application