When installing a float-controlled valve, what should be done before tightening the assembly?

When installing a float-controlled valve, placing the gasket against the flange before tightening the assembly is essential because it ensures a proper seal. The gasket is designed to fill the space between the valve and the flange, preventing leaks from occurring once the assembly is secured. Proper gasket placement is crucial for the integrity and efficiency of the system, as it minimizes the risk of leaking water and potential damage or malfunction of the system.

Tightening the assembly without first ensuring the gasket is correctly placed could lead to misalignment or improper sealing. This could create points of weakness where leaks might occur, defeating the purpose of the installation. In plumbing, the need for a proper seal is often emphasized, making this step essential in achieving a reliable and functional installation.