Abstract: A movable body that has a cylinder and a valve apparatus is accommodated inside an accommodating chamber of a pump body so as to cover a discharging orifice. A piston sucks a fluid into the movable body, and discharges the fluid from inside the movable body to the discharging orifice by being slid reciprocally through a piston sliding aperture of the cylinder. A relieving passage that communicates between a suction volume space of the accommodating chamber and the discharging orifice is formed between an inner surface of the accommodating chamber and the movable body by the movable body moving away from the discharging orifice in opposition to a force from a forcing body.

Abstract: A movable body that has a cylinder and a valve apparatus is accommodated inside an accommodating chamber of a pump body so as to cover a discharging orifice. A piston sucks a fluid into the movable body, and discharges the fluid from inside the movable body to the discharging orifice by being slid reciprocally through a piston sliding aperture of the cylinder. A relieving passage that communicates between a suction volume space of the accommodating chamber and the discharging orifice is formed between an inner surface of the accommodating chamber and the movable body by the movable body moving away from the discharging orifice in opposition to a force from a forcing body.

Abstract: An electromagnetic valve of a reduced size capable of suppressing temperature rise of a coil regardless of continuous electrical energization over an extended time while preventing attracting force from lowering includes a coil cooling fluid passage (9a; 8a; 4a) for communicating a coil cooling fluid sump space (2a) with a controlled pressure region for allowing a fluid to flow into the coil cooling fluid sump space (2a) from the controlled pressure region. The coil cooling fluid passage includes a small-diameter communicating passage portion (9a) provided so as not to exert influence to a hydraulic pressure prevailing in the controlled pressure region.

Abstract: An electromagnetic valve (100) which can ensure a predetermined response behavior while sustaining a desired control performance with operation noise being suppressed even after operation over an extended time includes a plunger assembly (15) having a plunger (7), a coil (2) for driving the plunger (7), a fixed core (4) disposed in a direction in which the plunger (7) is displaced for attracting the plunger assembly (15) to a retracted position upon electrical energization of the coil (2) to thereby hold the plunger at that position, a resilient member (8) disposed, being compressed, between the plunger (7) and the fixed core (4) to resiliently urge the plunger assembly (15) to an advanced position, and a spacer (9; 39) interposed between the plunger (7) and the fixed core (4). The spacer (9; 29; 39; 49) is provided with a protrusion (9a; 29a).

Abstract: An electromagnetic valve of a reduced size capable of suppressing temperature rise of a coil regardless of continuous electrical energization over an extended time while preventing attracting force from lowering includes a coil cooling fluid passage (9a; 8a; 4a) for communicating a coil cooling fluid sump space (2a) with a controlled pressure region for allowing a fluid to flow into the coil cooling fluid sump space (2a) from the controlled pressure region. The coil cooling fluid passage includes a small-diameter communicating passage portion (9a) provided so as not to exert influence to a hydraulic pressure prevailing in the controlled pressure region.

Abstract: An electromagnetic valve (100) which can ensure a predetermined response behavior while sustaining a desired control performance with operation noise being suppressed even after operation over an extended time includes a plunger assembly (15) having a plunger (7), a coil (2) for driving the plunger (7), a fixed core (4) disposed in a direction in which the plunger (7) is displaced for attracting the plunger assembly (15) to a retracted position upon electrical energization of the coil (2) to thereby hold the plunger at that position, a resilient member (8) disposed, being compressed, between the plunger (7) and the fixed core (4) to resiliently urge the plunger assembly (15) to an advanced position, and a spacer (9; 39) interposed between the plunger (7) and the fixed core (4). The spacer (9; 29; 39; 49) is provided with a protrusion (9a; 29a).