is activated energy directing beads formed on the housing halves as well as interfering surfaces about the periphery melt under a pressure and ultrasonic energy allowing the two housing halves to move toward each other and mate upon deactivation of the ultrasonic horn the molten plastic material cools and forms a seal about flow ports in the metallic sleeve as well as a fusion bond about the periphery of the housing application_number US 55798495 A description referring now more particularly to fig1 and 2 the housing 10 for valve construction in accordance with the present invention is shown as including an upper section 12 and a lower section 14 the upper section 12 defines an opening 16 through which a drive member extends to engage the spool as will be more fully described below the drive member extends from a drive motor fig8 which is secured in place by appropriate fasteners which engage additional openings 18 the upper section 12 includes a protrusion or extension 20 which when finally assembled extends into and is matingly received by a corresponding depression or cavity 22 in the lower section 14 however as shown in the disassembled and exploded views of fig1 and 2 the extension 20 defines a continuous peripheral surface 24 adjacent the outer edge of the housing section 12 the depression 22 defines a continuous peripheral surface 25 adjacent the outer edge of the housing.