Polypac Anti-Pump Seal

Polypac Anti-Pump Seal — Reliable protection for hydraulic cylinders

Polypac Anti-Pump Seal is designed to stop fluid pump-through and protect hydraulic systems during high-speed or uneven movements. Built with proven materials and precise manufacturing, this seal reduces leakage, stabilizes pressure, and extends cylinder life while minimizing maintenance.

What it does

The anti-pump seal blocks fluid from being forced past the piston or rod under rapid reciprocation or alternating pressure. This prevents internal leakage, pressure spikes and component wear — keeping cylinders running smoothly and efficiently.

Key features and advantages

• Durable materials: available in filled PTFE variants (bronze, carbon, graphite, MoS2, glass) and high-performance elastomers like NBR, FKM, EPDM, silicone, and FFKM.
• Custom sizes: Polypac’s factory and advanced tooling support bespoke seals for special working conditions.
• Low friction and long life: PTFE-filled options offer excellent wear resistance and low friction for demanding applications.
• Reliable sealing: designed to handle high pressure and rapid cycling without pump-through.
• Industry-leading testing: production and testing equipment ensure consistent quality and performance.

Why choose Polypac

Founded in 2008, Polypac combines deep seal expertise with modern manufacturing across a 10,000+ m² facility. We focus on sealing material development and customized solutions, keeping close partnerships with universities and research institutes to stay at the cutting edge. As a major Chinese seal manufacturer and oil seal supplier, we deliver quality, consistency and fast customization.

Applications

Polypac Anti-Pump Seals are ideal for hydraulic cylinders in construction machinery, mobile equipment, industrial presses, injection moulding, marine hydraulics and any system requiring stable pressure and minimal leakage during rapid movement.

Choose Polypac Anti-Pump Seal for proven anti-pumping performance, tailored dimensions and materials, and rigorous quality control. Contact Polypac today for technical support, samples and custom quotes to match your exact application needs.