In view of the foregoing, the invention provides a control valve including {HEAD ~ a negative pressure chamber} defined within {TAIL ~ a housing} and in which a negative pressure is maintained, a variable pressure chamber formed within the housing, an atmosphere chamber formed within the housing and into which the atmosphere is introduced, a valve mechanism disposed within the housing for switching communication between the individual chambers, and a solenoid for operating the valve mechanism 
defined within
In view of the foregoing , the invention provides a control valve including { HEAD ~ a negative pressure chamber } defined within { TAIL ~ a housing } and in which a negative pressure is maintained , a variable pressure chamber formed within the housing , an atmosphere chamber formed within the housing and into which the atmosphere is introduced , a valve mechanism disposed within the housing for switching communication between the individual chambers , and a solenoid for operating the valve mechanism
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH