Hydraulic Actuator Valve Assembly And Toilet Tank Flush Device Having The Same

A toilet tank flush device comprising:

• a water feeding tube;
• an electromagnetic valve disposed at said water feeding tube;
• a flush valve;
• a flexible connecting member;
• and
• a hydraulic actuator valve assembly including
• a cylinder including an inlet portion connected to said water feeding tube such that water can be fed into said inlet portion of said cylinder from said water feeding tube when said electromagnetic valve is opened, an upright cylinder body disposed above and in fluid communication with said inlet portion, and a supporting portion extending from and disposed above said upright cylinder body, said upright cylinder body being formed with a plurality of overflow holes permitting flow of water out of said upright cylinder body therethrough;
• a swing rod having a pivot end connected pivotally to said supporting portion of said cylinder, and a free end opposite to said pivot end, said flexible connecting member having two ends fastened respectively to said free end of said swing rod and said flush valve;
• a piston rod disposed within said upright cylinder body of said cylinder and having a top end disposed outwardly of said cylinder and in contact with an intermediate portion of said swing rod, said piston rod being movable within said cylinder between first and second positions, the first position being nearer to said inlet portion of said cylinder than the second position, said piston rod being moved from the first position toward the second position when water is fed from said water feeding tube into said inlet portion of said cylinder;
• and
• a resilient member for biasing said piston rod toward the first position.