Windmill 2 Leather Washer

The Windmill Leather Cup Washer is a foundational mechanical component engineered for use in deep-well hand pumps and wind-driven water lift systems. Specifically designed for a 50mm cylinder bore, this replacement washer serves as the primary pressure seal within the pump's cylinder, converting the reciprocating motion of the pump rod into the hydraulic lift required to draw water from subterranean sources.

Material Engineering and Composition

• Premium Grade Cattle Hide: Manufactured from high-density, oil-treated leather, the washer is chosen for its unique fibrous structure which provides superior tensile strength and abrasion resistance compared to synthetic alternatives.
• Self-Lubricating Properties: The leather is impregnated with non-toxic, food-grade lubricants during the tanning process. This treatment ensures the washer remains pliable in submerged environments and reduces friction against the internal walls of the brass or cast-iron cylinder.
• Hydro-Expansion Capability: A critical mechanical feature of the leather material is its ability to slightly expand when saturated. This ensures a vacuum-tight peripheral seal against the cylinder wall, maintaining high volumetric efficiency even as the pump components age.
• Structural Memory: The cup is precision-molded to maintain its flared geometry under significant hydraulic loads, ensuring that the downward stroke allows water bypass while the upward stroke provides maximum lift capacity.

Operational Reliability

The Windmill Leather Washer is engineered for longevity in remote and demanding environments where mechanical failure must be minimized. It is highly resistant to the scoring and pitting caused by sandy or silty water, as the natural fibers can often absorb small particulates that would otherwise tear a rubber seal.

With a standard center-hole configuration, the washer is compatible with most traditional 2-inch pump valves and plunger assemblies. Its robust construction allows it to withstand the constant pressure cycles of high-volume water extraction, making it an essential component for maintaining consistent water supply in agricultural and rural infrastructure. The natural composition of the leather ensures it remains environmentally inert, preserving the quality of the potable water being extracted.