Easy maintenance sensing type automatic faucet

A faucet adapted to be mounted to a deck and adapted to be communicated fluidly with at least one conduit, said faucet comprising:

• a mounting unit including
• a fixed seat adapted to be disposed fixedly on the deck and formed with at least one water-guiding hole and a plurality of inverted L-shaped retaining hooks disposed around said water-guiding hole, and
• a rotatable seat disposed rotatably on said fixed seat and having at least one tubular projection formed with a guide passage;
• and
• a valve unit including
• a housing including a water outlet at a top end portion thereof, an opening disposed below said water outlet, and a spacer plate disposed fixedly in said housing and below said opening,
• a coupling member co-rotatable with said rotatable seat and disposed fixedly in said housing, said coupling member including a top wall attached fixedly to said spacer plate, a plurality of L-shaped retaining grooves engaging respectively said retaining hooks, a through hole aligned with said tubular projection, a first water seal disposed between said top wall and said housing so as to establish a liquid tight seal therebetween, and a second water seal, each of said retaining grooves having an open end and a closed end,
• a valve seat disposed fixedly in said housing, said second water seal being disposed between said valve seat and said top wall so as to establish a liquid tight seal therebetween, said valve seat having a connecting portion extending through said through hole in said coupling member, and a water inlet in fluid communication with said guide passage and said water outlet,
• an electromagnetic valve disposed on said valve seat and between said water outlet and said water inlet for controlling outflow of water through said water outlet, and
• an infrared sensor connected electrically to said electromagnetic valve for controlling activation and deactivation of said electromagnetic valve;
• wherein, when said lock unit is operated to allow for rotation of said valve unit relative to said fixed seat, through operation of said valve unit, said retaining hooks are movable respectively into said closed ends of said retaining grooves so that said guide passage is in fluid communication with said water-guiding hole and so as to lock said valve unit relative to said fixed seat, and into said open ends of said retaining grooves so that said guide passage is not in fluid communication with said water-guiding hole and so as to allow for removal of said valve unit from said mounting unit.