Abstract: A pressure regulation valve device comprising a multi-diameter hollow cylindrical main body provided with a linear fluid passage and a valve seat and including different diameter portions with the largest diameter portion defining a pressure regulation chamber, a multi-diameter pressure regulation valve received within said main body for seating on and unseating from said valve seat and a pressure receiving portion provided by the largest diameter portion of said pressure regulation valve received in said largest diameter portion of the main body, said pressure receiving portion of the pressure regulation valve defining a secondary pressure chamber on one side and a reference pressure chamber on the opposite side within said pressure regulation chamber, a primary pressure passage formed in said largest diameter portion of the main body in communication with said reference pressure chamber, a reference pressure setting valve disposed in said primary pressure passage provided in said valve body and a communicat