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Single-Acting Piston Seal — Polypac Custom Hydraulic Seals

Polypac Single-Acting Piston Seal Solutions

Overview

Polypac manufactures High Quality Single-Acting Piston Seal designs for hydraulic cylinders where reliable return or pressurization control is essential. Leveraging 15+ years of experience in sealing material development and precision production, our seals deliver stable performance across a wide range of temperatures, pressures, and environments.

Materials & Performance

Our Single-Acting Piston Seal lineup uses advanced filled PTFE (bronze, carbon, graphite, MoS₂, glass) and elastomers including NBR, FKM, EPDM, silicone, and FFKM. These material combinations optimize friction, wear resistance, chemical compatibility, and extrusion resistance—ensuring long service life and consistent sealing under dynamic loads.

Customization & Manufacturing

Polypac’s 10,000+ m² facility with 8,000 m² of production space houses industry-leading machining and testing equipment. We offer tailored Single-Acting Piston Seal profiles, compound formulations, and dimensional tolerances to meet unique working conditions—thermal extremes, contaminated fluids, or space-constrained cylinders.

Applications

Designed for construction machinery, mobile hydraulics, industrial presses, and marine actuators, our Single-Acting Piston Seals provide reliable sealing for single-direction pressure cycles. Typical benefits include reduced leakage, lower wear rates, and improved energy efficiency.

Installation & Maintenance

Polypac seals are engineered for straightforward installation and predictable maintenance intervals. Proper groove design, lubrication recommendations, and inspection schedules reduce downtime and extend component life. We provide technical drawings and installation support for seamless integration.

Why Choose Polypac?

As one of China’s leading seal manufacturers, Polypac combines R&D partnerships with universities, extensive material expertise, and rigorous quality control to deliver Single-Acting Piston Seal solutions that meet global standards. Contact us for material selection guidance, sample testing, and volume production tailored to your application.

Single-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.

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

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.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

How important is surface finish on the metal parts that contact the seal?

Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.

Table of Contents

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Polypac Single-Acting Piston Seal Solutions
Overview
Materials & Performance
Customization & Manufacturing
Applications
Installation & Maintenance
Why Choose Polypac?
Single-Acting Piston Seal Display

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