Patent ID: 8746279

Claim:
A valve assembly for receiving working fluid from a working fluid source and then communicating said working fluid to and from a working device that is switchable from a first mode of operation to a second mode of operation at a predetermined pressure of said working fluid, said valve assembly comprising: a housing with a housing control bore, a supply port in selective fluid communication with said housing control bore for receiving said working fluid from said working fluid source, a control port in fluid communication with said housing control bore for communicating said working fluid to and from said working device, and a vent port in fluid communication with said housing control bore for selectively returning said working fluid to said working fluid source; a valve seat assembly disposed within said housing control bore, said valve seat assembly having a supply valve seat; a supply valve member selectively seated and unseated with said supply valve seat such that said working fluid is passed through said valve seat assembly to said control port at or above said predetermined pressure when said supply valve member is not seated with said supply valve seat and such that said working fluid is not passed through said valve seat assembly to said control port at or above said predetermined pressure when said supply valve member is seated with said supply valve seat; and a bleed orifice communicating said working fluid from said supply port to said control port at a second pressure that is less than said predetermined pressure when said supply valve member is seated with said supply valve seat.