The EYS Piston Pump is a hydraulically driven positive-displacement unit purpose-built for the continuous long-distance transfer of viscous slurry, semi-solid manure and high dry-matter media up to 20% DM. Automated dual-sensor piston control eliminates manual cycle management. Available in Standard and Short configurations, the pump installs directly beside pits or within low-clearance buildings, containers and biogas plants. With only two gaskets as serviceable wear parts and a 5.5 kW power requirement, it delivers exceptional throughput at the lowest possible operating cost.
The EYS Piston Pump is a hydraulically driven positive-displacement pump engineered for reliable long-distance transfer of viscous slurry, semi-solid manure and high dry-matter media across agricultural, biogas, industrial and civil applications. Backed by over 25 years of specialist design and production experience, EYS builds the Piston Pump as a direct, field-proven answer to the performance limitations and high aftersales costs of self-priming and lobe pump alternatives — a position validated by widespread adoption across French biogas plants, where operators have systematically replaced conventional pump types with EYS units.
Where other pump types lose performance or sustain rapid wear as solids content rises, the EYS Piston Pump maintains consistent volumetric output across the full media range — including materials up to 20% dry matter with long straw, sand and high-viscosity compounds that would block or damage alternative designs. This capability makes it the technically correct specification for unscreened raw manure, biogas feedstock loading, and any application where material consistency is variable or elevated.
Operation is fully automated through a precision dual-sensor piston control system. As the piston reaches upper travel limit, the top sensor triggers the downward stroke — forcing the inlet valve closed and the outlet valve open to transfer slurry into the discharge pipe. When the piston reaches lower limit, the bottom sensor initiates the upward suction stroke, drawing fresh material into the pump chamber. This closed-loop cycle requires no operator input and sustains consistent output across extended operating periods without intervention.
Maintenance simplicity is a defining design advantage. The EYS Piston Pump has only two serviceable wear parts: two gaskets. Regular gasket replacement is the sole planned maintenance requirement for long-term reliable operation — a stark contrast to the high ongoing component cost of lobe pumps and self-priming alternatives. A dedicated cleaning and maintenance flange provides rapid access to internal components when required, and four flap-mounted lubricators maintain bearing and seal condition throughout continuous operation.
The pump is offered in Standard and Short configurations. The Standard variant suits open-area and high-ceiling installations; the Short Piston Pump addresses low-clearance environments including biogas containers and confined plant rooms, achieving identical volumetric capacity through a higher operating cycle speed. For applications requiring elevated sustained flow, two EYS Piston Pumps connect to a single hydraulic power pack via a dedicated connection kit. In this dual-pump configuration, units operate in alternating synchronisation — one suctions while the other discharges — producing near-continuous flow output with no increase in power consumption. The EYS Piston Pump integrates directly into ENVIROXX separation, dewatering and field-application system configurations as the primary transfer mechanism within larger process plant installations.
