Hydraulic & Pneumatic Seals

UN/UHS PU Hydraulic Piston Seals for Excavator Cylinders

Key Features

Reliable Hydraulic Oil Sealing
Excellent Wear Resistance
Good Mechanical Strength
Suitable for Reciprocating Movement
Multiple Sizes and Profiles Available

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Description
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Product Overview

PU Hydraulic Piston Seals are designed to prevent hydraulic oil leakage between the piston and cylinder bore in hydraulic systems. Made from durable polyurethane (PU), they provide good wear resistance, mechanical strength, and sealing performance under reciprocating movement.

These polyurethane piston seals are widely used in excavators, forklifts, loaders, agricultural machinery, and industrial hydraulic cylinders. Various sizes and profiles are available to meet different equipment requirements. Custom manufacturing is supported based on drawings, samples, and technical specifications.

Item Specification
Product Name Hydraulic Seal
Size Full range of sizes & models
Temperature Range -30℃ ~ +150℃
Material Bayer TPU (Germany)
Max Speed ≤0.5 m/s
Color Green, Blue
Compatible Media Mineral oil, hydraulic oil, emulsified oil, etc.

Key Features

Reliable Hydraulic Oil Sealing

Excellent Wear Resistance

Good Mechanical Strength

Suitable for Reciprocating Movement

Multiple Sizes and Profiles Available

Material

Polyurethane (PU / TPU)

Other material options available upon request

Applications

Excavator Hydraulic Cylinders

Forklift Hydraulic Systems

Wheel Loaders and Construction Equipment

Agricultural Machinery

Industrial Hydraulic Cylinders

Our Advantages

JINNAI SEAL specializes in manufacturing high-quality hydraulic seals, polyurethane (PU/TPU seals, and custom rubber sealing products for industrial applications. With professional technical support, precision manufacturing equipment, and strict quality control, we provide reliable sealing solutions for hydraulic cylinders, construction machinery, agricultural equipment, and industrial systems.

Premium TPU Material

We use quality polyurethane (TPU) materials with excellent wear resistance, elasticity, and aging resistance. Our PU hydraulic seals and polyurethane wiper seals are designed for demanding sealing applications and long service life.

Excellent Performance

Our hydraulic sealing products are engineered to provide reliable sealing performance under pressure and reciprocating movement. They help reduce leakage, resist wear, and protect hydraulic systems in challenging operating conditions.

Precision Manufacturing

Advanced tooling and precision machining help ensure accurate dimensions, consistent profiles, and reliable fit. We manufacture custom hydraulic seals according to technical drawings, samples, and specific application requirements.

Professional Service

Our experienced team provides technical support and customized sealing solutions for OEM manufacturers, equipment suppliers, and industrial buyers. We support different sizes, materials, hardness levels, and seal profiles to meet your application needs.

JINNAI SEAL – Your Reliable Partner for Hydraulic Seals and Custom Sealing Solutions.

Customization

Custom sizes, profiles, hardness, and material options are available according to customer drawings or samples.

One-stop industry seals

Contact JINNAI SEAL for product specifications, custom sizes, technical support, and OEM manufacturing services. Send us your drawings, samples, or dimensional requirements to discuss a suitable sealing solution.

FAQs

What is the function of a hydraulic piston seal?

A hydraulic piston seal prevents hydraulic fluid from leaking between the piston and cylinder bore. It helps maintain pressure and ensures efficient hydraulic cylinder operation.

What materials are commonly used for hydraulic piston seals?

Polyurethane (PU / TPU), NBR, and PTFE are commonly used materials. The appropriate material depends on operating temperature, pressure, fluid compatibility, and working conditions.

Where are PU hydraulic piston seals commonly used?

PU piston seals are widely used in excavators, forklifts, loaders, agricultural machinery, construction equipment, and industrial hydraulic cylinders.

How do I select the correct DH wiper seal size?

Selection should be based on the piston rod diameter, housing bore, seal dimensions, and groove design. Providing a technical drawing or sample can help confirm the correct specification.

What is the difference between a piston seal and a rod seal?

A piston seal is installed on the outer diameter of the piston to prevent fluid leakage between the piston and cylinder bore. A rod seal is installed in the cylinder head to prevent hydraulic oil from leaking along the piston rod.

How do I select the correct hydraulic piston seal size?

Selection depends on the piston diameter, cylinder bore, groove dimensions, operating pressure, temperature, and hydraulic fluid. Technical drawings or samples can help confirm the correct size.

Are polyurethane piston seals suitable for high-pressure hydraulic systems?

PU piston seals can be used in many hydraulic applications. Their pressure capability depends on the seal profile, material grade, clearance gap, groove design, and operating conditions.

Can PU hydraulic piston seals be customized?

Yes. Custom piston seals are available in different sizes, profiles, hardness levels, and material specifications according to customer drawings, samples, or application requirements.

How can I extend the service life of hydraulic piston seals?

Use the correct seal material and size, ensure proper groove dimensions and installation, maintain suitable rod and cylinder surface conditions, and keep the hydraulic fluid clean.

Item	Specification
Product Name	Hydraulic Seal
Size	Full range of sizes & models
Temperature Range	-30℃ ~ +150℃
Material	Bayer TPU (Germany)
Max Speed	≤0.5 m/s
Color	Green, Blue
Compatible Media	Mineral oil, hydraulic oil, emulsified oil, etc.