Patent ID: 7717089

Claim:
A pump comprising: a housing that has a compression chamber for pressurizing fluid, the housing further having a fluid passage for guiding fluid into the compression chamber; a valve that is located midway through the fluid passage, the valve being adapted to communicating the fluid passage, the valve including a valve body and a plug selectively seated on a seat face of the valve body, the valve being adapted to blocking the fluid passage when the plug engages the seat face of the valve body; a solenoid actuator that is located on a substantially opposite side of the valve with respect to the compression chamber, the solenoid actuator being adapted to operate the valve; and a regulating member that is located between compression chamber and the solenoid actuator for regulating intrusion of fluid from the compression chamber around the valve body and into the solenoid actuator, wherein the regulating member includes a seal member and an engaging member, the seal member is located between an outer circumferential periphery of the valve body and an inner circumferential periphery of the housing, the engaging member is adjacent to the outer circumferential periphery of the valve body and engaged with both the valve body and the housing, the engaging member holds the valve body at a fixed position relative to the housing, the seal member is in contact with both the outer circumferential periphery of the valve body and the inner circumferential periphery of the housing, the engaging member is directly in contact with an end of the valve body on a side of the solenoid actuator, and the engaging member is a washer substantially in a C-shape.