✅ Common Delavan Pressure Switch Assembly 📌 Delavan 7800-PSW-100 Pressure Switch Assembly Designed for Delavan demand-style diaphragm pumps such as Series: 5800 / 5900 7801 / 7802 / 7811 / 7812 7822FS I-Series 7870 / 7871 / 7970 / 7971 FB2 & FB3 Series Pressure range: 60–100 PSI (typical) Replaces part number 7800-PSW and fits on top of the pump to control cut-in / cut-out pressure. This is the standard pressure switch assembly used on many Delavan diaphragm pumps so the pump will turn off once a set pressure is reached and turn back on when pressure drops. 📌 Typical Usage Mounted directly on top of Delavan demand pumps Regulates pump operation pressure Ensures proper ON/OFF cycling Used in agriculture sprayers, cleaning rigs, fluid transfer systems, etc. 🧩 Notes for Parts/Replacement This assembly is often sold as a standalone pressure switch separate from the pump head. Works as a direct replacement when your pump is cycling incorrectly or not building pressure.
