Control apparatus of vacuum valve

A control apparatus of a vacuum valve which is interposed between one end of a water suction pipe having the other end open to a water storage basin, and a vacuum-sucked vacuum water supply pipe, the vacuum valve being opened when a degree of vacuum within a pressure chamber becomes equal to or more than a first degree of vacuum and closed when the degree of vacuum within the pressure chamber becomes lower than the first degree of vacuum, the control apparatus of the vacuum valve comprising:

• a switching valve mechanism having a casing formed with a first pressure change chamber communicated with the vacuum water supply pipe and a second pressure change chamber communicated with a pressure chamber of the vacuum valve, a switching valve body arranged within the casing so as to be linearly movable between an open position where the first pressure change chamber is communicated with the second pressure change chamber, and a closed position where the communication between the first pressure change chamber and the second pressure change chamber is shut off, and a first retention mechanism retaining the switching valve body at the open position and the closed position by a previously set retention force;
• a first actuator having an opening actuation member that is attached to the casing of the switching valve mechanism so as to be linearly movable along a linear moving direction of the switching valve body in conjunction with ascent and descent corresponding to a water level of a float accommodated within the water storage basin, the opening actuation member moving the switching valve body from the closed position to the open position against the retention force of the first retention mechanism when the float ascends to a previously set first water level;
• and
• a second actuator having a switching cylinder that is attached to the casing and is formed with a pressure detection chamber communicated with the vacuum water supply pipe in an inner portion thereof, and a closing actuation member that is linearly movable in the linear moving direction of the switching valve body, the closing actuation member advancing so as to move the switching valve body from the open position to the closed position against the retention force of the first retention mechanism when a degree of vacuum within the pressure detection chamber becomes equal to or less than a second degree of vacuum.