They are frequently custom valves designed for the particular device, and should include a metallic block with ports and channels drilled. Cartridge valves are threaded to the ports and will be electrically controlled by switches or simply a microprocessor to route fluid electricity as needed. include 3 ports linked through https://edgarhgebv.estate-blog.com/15658252/the-smart-trick-of-pressure-gauge-4-that-no-one-is-discussing