Spool valve has a pressure inlet port, a work port and a tank port. It is responsible for communicating the pressure inlet port to the work port and the work port to the tank port. Spool valve consists of two body segments and a balanced spool shaft. The spool valve is based on a balanced spool design to create a fast 'ON/OFF' fluid dispensing function that is not affected by material input pressure. The valve is designed to be opened by air pressure and closed by a return spring (single acting).
Spot plating has been used predominantly to apply precious metals to the contact interface. It requires tooling design and is built specifically for a particular connector part. The tooling operates on plating equipment that is much more sophisticated than standard plating equipment. It also allows two or more different metal plating in the same horizontal plane, significantly reducing base metal usage and die width for new contact designs.