Hitachi 887515 Pressure Switch With Unloader Valve Push Pull On Off

The Hitachi 887515 Pressure Switch with Unloader Valve is a push-pull on/off control device that automates a pneumatic system by sensing system pressure and actuating electrical contacts to start or stop the connected equipment. The unit includes an unloader valve that vents residual pressure after shutdown, which eases restart and reduces the load on the drive motor when cycling resumes. Identified by part number 887515, this Hitachi component can function as a direct replacement or upgrade in installations that require a pressure-switch with an integrated unloader feature, offering straightforward manual override through its push-pull control in addition to automatic pressure-based cycling. The combination of a reliable switch mechanism and an unloader valve makes it suitable for applications where controlled pressure shutoff and smooth restart are important, helping to maintain consistent system operation in compatible pneumatic or compressed-air setups.