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Double Acting Piston Seal — Polypac Hydraulic Seal Solutions

Double Acting Piston Seal — Reliable Hydraulic Sealing by Polypac

Overview

Polypac's Double Acting Piston Seal is engineered to seal a piston in both directions of travel, providing dependable pressure containment and minimized leakage in hydraulic cylinders. Designed for industrial, mobile, and offshore applications, our seals combine low friction, high wear resistance, and consistent performance across a broad pressure and temperature range.

Materials & Construction

Our Double Acting Piston Seal family uses advanced materials including filled PTFE (bronze, carbon, graphite, MoS₂, glass-filled) and elastomers such as NBR, FKM, EPDM, silicone, and FFKM. Polypac leverages proprietary compound formulations and precision molding to optimize resilience, extrusion resistance, and chemical compatibility tailored to each working condition.

Performance & Application

Built for high-pressure hydraulics, Polypac Double Acting Piston Seals deliver superior dynamic sealing for cylinders, presses, and actuators. Typical benefits include low breakaway torque, extended service life, and stable sealing under varying speeds and temperatures, making them ideal for construction equipment, industrial machinery, and marine systems.

Customization & Quality Control

With a 10,000+ m² facility and industry-leading production and testing equipment, Polypac provides custom sizes, compound blends, and integrated O-ring solutions. Since 2008, we collaborate with universities and research institutes to validate material performance and ensure every Double Acting Piston Seal meets stringent quality and endurance standards.

Installation & Maintenance

Polypac Double Acting Piston Seals are designed for straightforward installation with clear tolerances and recommended lubrication regimes. We supply technical datasheets and application support to reduce downtime and simplify maintenance cycles, ensuring reliable, repeatable sealing performance in the field.

Why Choose Polypac

Polypac is a scientific and technical hydraulic seal manufacturer and oil seal supplier specializing in seal production, sealing material development, and customized sealing solutions for special working conditions. From prototype to volume production, our commitment to R&D, precision manufacturing, and customer service makes Polypac the trusted partner for Double Acting Piston Seal solutions worldwide.

Double Acting Piston Seal Display

FAQ:

What is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

Why did my O-ring fail prematurely?

Common causes of O-ring failure include: Chemical Incompatibility: Swelling, softening, or cracking due to fluid exposure. Improper Sizing: Using an incorrect size leads to over-compression or inadequate sealing force. Abrasion: Wear and tear from rough surface finishes or contaminated fluid. Extrusion: The seal is forced into the gap between metal parts under high pressure. Installation Damage: Nicks, cuts, or twists during assembly.

How can I prevent seal damage during installation?

Use Tools: Always use dedicated installation tools (e.g., picks, cones, guides). Lubricate: Always lubricate the seal and the contact surface. Protect Sharp Edges: Cover sharp threads and edges with tape or use an installation sleeve. Check the Groove: Ensure the installation groove is clean, deburred, and undamaged.

What does "AS568" mean?

AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.

Table of Contents

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Double Acting Piston Seal — Reliable Hydraulic Sealing by Polypac
Overview
Materials & Construction
Performance & Application
Customization & Quality Control
Installation & Maintenance
Why Choose Polypac
Double Acting Piston Seal Display

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