The SPGW compact hydraulic piston seal is a double-acting combination seal designed for reciprocating hydraulic systems . It consists of a PTFE sealing ring with an NBR rubber energizer, making it ideal for high-pressure, heavy-load applications in excavators, loaders, bulldozers, and other engineering machinery
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Product Overview
The SPGW seal is a double-acting piston seal specifically engineered for heavy-duty hydraulic applications. It features a PTFE sealing ring with an NBR rubber O-ring that acts as an energizer, providing constant sealing force even under low pressure conditions . This design allows the seal to perform excellently in high-pressure working conditions, withstanding up to 50 MPa while maintaining low friction and long service life
Specifications and Parameters：
Minimum order: 10 sets
| Parameter |
Detail |
| Product Name |
SPGW Compact Hydraulic Piston Seal |
| Type |
Double-acting combination piston seal |
| Sealing Ring Material |
Filled PTFE (Polytetrafluoroethylene) |
| Energizer Material |
NBR (Nitrile Butadiene Rubber) |
| Backup Ring Material |
POM or PA (Polyoxymethylene / Nylon) |
| Hardness |
90 Shore A (NBR energizer) |
| Color |
Brown (PTFE ring), Black (NBR), Green/Yellow (backup rings) |
| Working Pressure |
≤ 50 MPa |
| Temperature Range |
-35°C to +105°C |
| Working Speed |
≤ 1.5 m/s |
| Medium |
Mineral oil-based hydraulic oils, water-glycol, oil-water emulsions |
| Application |
Piston seal for double-acting hydraulic cylinders |
Product Features
1. Double-Acting Design
The SPGW seal provides bidirectional sealing, making it suitable for double-acting hydraulic cylinders where pressure alternates on both sides of the piston .
2. High Pressure Capability
With a maximum working pressure of 50 MPa, the SPGW seal offers excellent extrusion resistance and maintains stable performance under shock loads and pressure peaks .
3. Low Friction Operation
The PTFE sealing ring has a very low coefficient of friction, reducing wear and preventing stick-slip (crawling) phenomenon during operation .
4. Excellent Sealing Performance
The combination of PTFE sealing ring and NBR energizer provides outstanding sealing performance in both dynamic and static conditions .
5. Large Extrusion Gap Tolerance
The seal allows for larger piston-to-cylinder gaps, which reduces machining costs and makes it suitable for applications with contamination present .
6. Simple Groove Design
The SPGW seal features a simple groove structure that is easy to machine and is suitable for one-piece (integral) pistons .
7. Long Service Life
The PTFE material offers excellent wear resistance, resulting in extended seal life even in demanding applications .
8. Wide Temperature Range
Operating from -35°C to +105°C, the SPGW seal performs reliably in various climate conditions .
Applications
The SPGW compact piston seal is widely used in hydraulic cylinders for heavy-duty applications:
● Excavator hydraulic cylinders (boom, arm, bucket)
● Loader hydraulic systems
● Bulldozer lift cylinders and tilt cylinders
● Forklift mast cylinders
● Crane telescopic cylinders
● Dump truck hoist cylinders
● Hydraulic presses
● Injection molding machines
● Industrial hydraulic equipment
Available Sizes
● SPGW seals are available in a wide range of sizes.
● Custom sizes are available upon request. Standard size range: 50mm to 320mm bore diameter .
Comparison with Other Seal Types
| Seal Type |
Pressure Rating |
Speed |
Key Feature |
| SPG |
≤ 35 MPa |
1.5 m/s |
Standard double-acting piston seal |
| SPGW |
≤ 50 MPa |
1.5 m/s |
High-pressure version |
| SPGO |
≤ 40 MPa |
5 m/s |
High-speed version |
Frequently Asked Questions (FAQ)
Q: What does SPGW stand for?
A: SPGW is a standard type code for a double-acting combination piston seal with PTFE sealing ring and NBR energizer .
Q: What materials are used for SPGW seals?
A: The seal consists of a filled PTFE sealing ring, an NBR rubber energizer (O-ring), and optional POM/PA backup rings .
Q: What is the maximum working pressure?
A: The maximum working pressure is 50 MPa .
Q: What is the temperature range?
A: The seal operates from -35°C to +105°C .
Q: Is this seal suitable for double-acting cylinders?
A: Yes, the SPGW seal is specifically designed for double-acting hydraulic cylinders .
Q: What makes SPGW different from SPG?
A: SPGW is the high-pressure version with a pressure rating of 50 MPa, compared to SPG’s 35 MPa rating .
Q: Do you accept custom orders?
A: Yes, we accept custom orders for non-standard sizes. Please provide your specifications and required quantities.
Q: What are your payment terms?
A: We accept T/T (bank transfer), L/C, MoneyGram, Western Union, and cash.
