I am about to install a 1hp submersible well pump in combination with a 100 liter pressure tank and pressure switch. Now the shop where I bought the components advised me to install a check valve before the pressure tank with a small hole drilled in the shutter. Water will be pumped slowly into the pressure tank because shutter is being forced into the closed position by the pump pressure but has a small hole in the shutter. When a water tap is opened the water from the pressure tank gets out fast because the shutter will be forced into open position by water pressure from tank. Does this make sense? and is it advice-able? and if so, why? (I am in Thailand and it is not always easy to have things explained clearly because they don't speak English)