Water injection apparatus for water jet loom

A water injection apparatus for a water jet loom, comprising:

• a weft insertion nozzle for weft insertion of a weft yarn by injection water;
• a weft insertion pump pumping water into the weft insertion nozzle;
• a water storage tank storing water introduced into the weft insertion pump;
• and
• a suction pipe passing water from the water storage tank into the weft insertion pump, wherein the water injection apparatus includes an auxiliary water supply unit that is provided separately from the weft insertion pump, the auxiliary water supply unit including an auxiliary water supply pipe having one end that is connected to the suction pipe and another end that is connected to an auxiliary water supply source, the auxiliary water supply unit supplying water to the suction pipe at least when the weft insertion pump sucks water,
• wherein the one end of the auxiliary water supply pipe is connected to a portion of the suction pipe located between the water storage tank into the weft insertion pump.