In this practical guide, learn how Eldex’s piston wash ports manage crystallizing fluids—such as salts or buffers—in a way that minimizes abrasion, reduces maintenance, and extends pump life. This guide explains how the wash chambers function, how to set them up, and why they are essential..
Why Piston Wash Ports Matter
Eldex pumps feature piston wash ports to enhance the longevity and reliability of piston seals. This is particularly important when working with solutions prone to crystallization, such as saline or buffered fluids.
How They Work
Fluids crystallize due to exposure to air, causing abrasion and damage to piston seals. The wash ports allow users to flush out these residues before they accumulate, ensuring smoother operation and reducing wear.
Important: These wash ports are not self-flushing. You must flush them using one of the following methods:
- Manual flushing using a syringe to draw fluid through the wash chamber.
- Drip system with a reservoir that delivers a steady flow of fluid.
- Continuous circulation using a small peristaltic pump to keep fluid moving.
Design Features
The cutaway view of the pump’s liquid end illustrates the internal wash chamber design.
- Wash chamber: Integrated into the pump head with two barbed fittings (wash ports).
- Port configuration: Lower fitting = inlet; upper fitting = outlet.
- Tubing setup: Connect 1/8-inch inner diameter (ID) tubing to circulate wash fluid through the chamber.
Recommended Wash Solution
A standard wash solution is a mixture of water and 20% methanol. However, the best choice depends on the fluid being pumped. When selecting a wash fluid:
- Use a solution compatible with the pumped fluid to prevent reactions.
- Rinse thoroughly after using acidic or alkaline washes to avoid corrosion.
- Always work in well-ventilated areas using volatile or strongly scented solutions such as methanol or peracetic acid.
Signs You May Need a Wash System
- Increased seal wear: Unusual degradation may be due to crystal abrasion.
- Fluid leakage: Leaks around the wash ports could signal seal failure.
- Reduced performance: Inconsistent flow or pressure may point to piston obstruction.
- Frequent maintenance: If you’re replacing seals often, residues may not be flushed adequately.
Key Benefits
- Extended piston seal life: Reduced wear leads to longer service intervals.
- Less maintenance downtime: Prevents damage caused by crystal deposits.
- Improved reliability: Clean pistons ensure stable and consistent performance.
Conclusion
The wash port system reflects Eldex’s commitment to reliable, long-lasting pump performance. Whether you’re in pharmaceuticals, chemical manufacturing, oil production, or research labs, this feature helps extend equipment life and reduce maintenance headaches.
