Abstract: Provided is a reversing valve for reversing flow in a refrigeration system. The reversing valve includes a valve body having first, second, third, and fourth ports disposed into the valve body. A valve member inside the valve body can be selectively moved between a first position intersecting the second and third ports and a second position intersecting the second and fourth ports. The valve member defines a channel that directs flow between the selected pairs of ports. The channel is generally shaped as a curve that bends the flow between the selected ports. To reduce the pressure drop across the reversing valve, a flow splitter is included that divides the channel into multiple sub-channels. Dividing the channel into multiple sub-channels increases the curve ratio of the channel, which reduces the generation of turbulent secondary flows in the channel. The flow splitter also provides additional structural support to the valve member.

Abstract: A mold for molding recorded discs includes a pair of mold plates, at least one of which is movable toward and away from the other mold plate and a center hole forming pin slidably mounted in an opening in one of the mold plates for movement toward and away from the other mold plate. The center hole forming pin includes an elongated rod having a passage extending longitudinally therethrough from an outer end to a closed inner end. A tube is mounted in the passage and divides the passage into an inner portion within the tube and an outer portion between the tube and the wall of the passage. A pair of tubular fittings are mounted on the rod with one fitting being connected to the inner portion of the passage and the other fitting being connected to the outer portion of the passage. A tubular sleeve cap is threaded on the closed end portion of the rod and is of a material harder than the material of the rod.