Superhigh pressure control system

A superhigh pressure control system comprising:

• a first booster and a second booster which are operative through reciprocating motions of oil hydraulic cylinders to pressurize water sucker into wet or pressurizing plunger chambers and discharge pressurized water to a water discharge line;
• first directional control means and second directional control means which are respectively disposed between respective oil hydraulic cylinders of the first and second boosters and oil hydraulic sources so as to enable reciprocation of the oil hydraulic cylinders, the first and second directional control means having three switching positions, which are pressing, prepressing and suction positions;
• a first forward stroke sensor for detecting a position adjacent to the end of each pressing stroke and a first return stroke sensor for detecting a position adjacent to the end of each suction stroke which are disposed in the first booster;
• a second forward stroke sensor for detecting a position adjacent to the end of each pressing stroke and a second return stroke sensor for detecting a position adjacent to the end of each suction stroke which are disposed in the second booster;
• and
• control means which is operative, during each pressing stroke of the first booster, to switch the second directional control means from the suction position to the prepressing position in response to a detection signal from the second return stroke sensor, and then to switch the first directional control means from the pressing position to the suction position and the second directional control means from the prepressing position to the pressing position in response to a detection signal from the first forward stroke sensor, and which is operative, during each pressing stroke of the second booster, to switch the first directional control means from the suction position to the prepressing position in response to a detection signal from the first return stroke sensor, and then to switch the second directional control means from the pressing position to the suction position and the first directional control means from the prepressing position to the pressing position in response to a detection signal from the second forward stroke sensor.