Patent ID: 7207353

Claim:
A pilot controlled multiway valve comprising: an elongated principal valve housing having an integral wall section at one end thereof, a removable cover part at an opposite end thereof, a longitudinal spool receiving space formed therein and terminating at one end at said wall section and terminating at an opposite end at said cover part, a first pilot valve recess formed in said integral wall section axially parallel with said spool receiving space, a second pilot valve recess formed in said cover part opposite said first pilot valve recess and axially parallel with said spool receiving space, a first auxiliary operating member recess formed in said wall section perpendicular to said first pilot valve recess and said spool receiving space, a second auxiliary operating member recess formed in said cover part perpendicular to said second pilot valve recess and said spool receiving space, a first assembly interface disposed on an outer surface of said wall section surrounding said first pilot valve recess, a second assembly interface disposed on an outer surface of said cover part surrounding said second pilot valve recess, a first valve seat formed integrally with a bottom of said first pilot valve recess, a second valve seat formed integrally with a bottom of said second pilot valve recess and a plurality of valve ducts opening laterally into said spool receiving space; a valve spool slidably received in said spool receiving space, said valve spool having a control section for controlling a connection between said valve ducts and a drive section disposed at an end thereof adjacent said wall section; a first pilot valve for controlling fluid action on said valve spool drive section, said first pilot valve including a head piece mounted on said first assembly interface of said valve housing wall section and an electrically operated pilot control member engaging said first integral valve seat; a second pilot valve disposed coaxially opposite said first pilot valve for controlling fluid action on said valve spool drive section, said second pilot valve including a head piece mounted on said second assembly interface of said valve housing cover part and an electrically operated pilot control member engaging said second integral valve seat; a first auxiliary operating member for manually disengaging said first pilot control member from said first integral valve seat, said first manual auxiliary operating member being received in said first auxiliary operating member recess of said valve housing wall section; and a second manual auxiliary operating member for manually disengaging said second pilot control member from said second integral valve seat, said second manual auxiliary operating member being received in said second auxiliary operating member recess of said valve housing cover part.