Abstract: Crankcase heater including heat-generating electrical resistance elements and the method of manufacturing such heaters. The resistance elements include at least one positive temperature coefficient (PTC) heater element, platelet in form, adhesively bonded between a pair of metallic conductor-electrodes using an electrically conductive adhesive of high thermal conductivity. The electrodes formed for integral connection to electrically conductive lead wires serve as heat sinks dimensioned in length to provide a heater of predetermined wattage. The assembly of resistance elements, electrodes and lead wire connections are molded within the sheath of electrical insulation which is a silicone elastomer, having ceramic particles dispersed therein for enhanced thermal conductivity. The insulated heater is dimensioned in cross section so that when disposed within the well of a crankcase (compressor) its outer surface will leave a clearance which is less than thermal expansion of the silicone elastomer.

Abstract: A valve which has an outlet orifice, a solenoid including an armature and energizable coil, in which the armature is movable toward and away from said orifice in response to energizing and deenergizing the coil. The armature carries a first sealing member for sealing said orifice. A second sealing member movable out of sealing engagement about the periphery of said orifice in response to movement of said armature away from the orifice. The first and second sealing members are independently movable toward sealing engagement with the orifice. The valve also includes means independently urging the first and second sealing members into sealing engagement in and around the orifice.