Have been improving on how liquid moves through pipes and have succeeded in making pneumatically driven switches from stock material.
The reason effort is being put into making these switches is cost, customization, and footprint savings. The only pneumatic switches that have been found that fit my application are costly, come in limited sizes and are large. They are also made outside of the USA (in Germany) which increases lead time. Now I can make switches for low material cost (less than a 50 cents for an individual switch), custom input/output flow, and low footprint 20x20x10mm. The machining of the switch is done by computer program so no human effort is needed.
As a note I have been using 'pneumatic' to describe the switches, Technically they can operate with air or water which means it should be described as a pneumatic/hydraulic switch.
Reworking electrically driven fluid drivers. They are not strong or fast enough to be used in the final product.