Method and system for preventing incontinent liquid drip

An incontinent liquid drip-preventative method for preventing occurrence of incontinent liquid drip of a fluid from a discharge port when a flow of said fluid supplied from a fluid supply source is shut off, said incontinent liquid drip-preventative method comprising the steps of:

• determining an operation control pattern comprising a velocity and acceleration of said fluid flowing through a fluid passage dependent on a lift amount of a valve plug for closing said fluid passage with respect to time;
• controlling said lift amount so that said filled flowing through said fluid passage flows according to said operation control pattern from initiation of a valve-closing operation instruction until arrival at a preset quick valve-closing operation position at which a flow lime of said fluid discharged from said discharge port attains a predetermined constricted state, in accordance with a driving action of an electric actuator;
• maintaining said predetermined constricted state for a preset time period;
• and
• controlling said valve plug to close said fluid passage, wherein said valve plug moves to a closed position after said arrival at said quick valve-closing operation position and after said flow line of said fluid discharged from said discharge port has been in said predetermined constricted state for said preset time period.

An incontinent liquid drip-preventative method for preventing occurrence of incontinent liquid drip of a fluid from a discharge port when a flow of said fluid supplied from a fluid supply source is shut off, said incontinent liquid drip-preventative method comprising the steps of;

• determining an operation control pattern comprising a velocity and acceleration of said fluid flowing through a fluid passage dependent on a displacement amount of a piston of a pump with respect to time;
• controlling said displacement amount of said piston so that said fluid flowing through said fluid passage flows according to said operation control pattern from initiation of a discharge stop operation instruction for said pump until a flow line of said fluid discharged from said discharge port attains a predetermined constricted state, in accordance with a driving action of said pump;
• maintaining said predetermined constricted state for a preset time period;
• and
• controlling a valve plug of an opening/closing valve to close said fluid passage, wherein said valve plug moves to a closed position after said flow line of said fluid discharged from said discharge port has been in said predetermined constricted state for said preset time period.

An incontinent liquid drip-preventative system comprising:

• a fluid supply source for supplying a fluid at a constant velocity;
• an opening/closing valve for controlling a flow rate of said fluid flowing through a fluid passage by displacing a valve plug to open and close said fluid passage in accordance with a driving action of an electric actuator;
• a memory stored with a plurality of operation control patterns each comprising a velocity and acceleration for a fluid flowing through said fluid passage, said operation control patterns corresponding to different fluid characteristics of respective fluids, for controlling a lift amount of said valve plug with respect to time from initiation of a valve-closing operation instruction for said opening/closing valve until arrival at a preset quick valve-closing operation position at which a flow line of said fluid discharged from a discharge port attains a predetermined constricted state, for maintaining said predetermined constricted state for a preset time period, and for controlling said valve plug to close said fluid passage, wherein said valve plug moves to a closed position after said arrival at said quick valve-closing operation position and after said flow line of said fluid discharged from said discharge port has been in said predetermined constricted state for said preset time period;
• and
• a control mechanism for controlling an amount of electric power applied to said electric actuator in accordance with said operation control pattern read from said memory, so that a lift position of said valve plug is controlled in a valve-closing direction.

An incontinent liquid drip-preventative system comprising:

• a fluid supply source for supplying a fluid at a constant velocity;
• a pump for controlling a discharge amount of said fluid sucked from said fluid supply source by controlling a displacement amount of a piston in accordance with an applied electric power;
• an opening/closing valve for opening and closing a fluid passage by displacing a valve plug;
• a memory stored with a plurality of operation control patterns each comprising a velocity and acceleration for a fluid flowing through said passage, said operation control patterns corresponding to different fluid characteristics of respective fluids, for controlling a displacement amount of said piston with respect to time from initiation of a discharge stop operation instruction for said pump until a flow line of said fluid discharged from a discharge port attains a predetermined constricted state, for maintaining said predetermined constricted state for a preset time period, and for controlling said valve plug to close said fluid passage, wherein said valve plug moves to a closed position after said flow line of said fluid discharged from said discharge port has been in said predetermined constricted state for said preset time period;
• and
• a control mechanism for controlling an amount of electric power applied to said pump in accordance with said operation control pattern read from said memory, so that said displacement amount of said piston is controlled.