Abstract: A proportional flow control valve that has a main valve member controlling communication between an inlet and an outlet and a pilot valve in communication with the fluid inlet. A spring biases the main valve member into its closed position against the pressure of the fluid at the inlet which is applied to the main valve member in a direction to open the valve. The fluid pressure within the pilot chamber opposes opening of the valve. A magnetic armature which can be positioned in a selected longitudinal position is provided to open the valve. As fluid pressure is applied to both sides of the main valve member, it is the longitudinal position of the armature which determines the longitudinal position of the main valve member. The main valve member has a converging portion extending with a tubular member, on one end of which the fluid outlet is defined.

Abstract: A probe element for probe apparatus such as a dental probe comprises a curved tubular sheath having a proximal end for connection to main body of the probe apparatus and on open distal end. A probe member slides within the sheath and has a proximal end for connection to position sensing components in the probe apparatus main body and a distal end that protrudes by a variable extent from the open distal end of the sheath. Within the sheath the probe member is made up of a series of relatively large diameter beads joined by smaller diameter bridges to provide improved mobility of the probe member in the sheath even after prolonged storage.