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
SANPING SEAL – Engineering Machinery High-End Seals – 17 Years Export Expertise
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
Compatible Equipment
The SPGW seal is suitable for hydraulic cylinders in construction machinery from major brands including:
● Caterpillar (CAT)
● Komatsu
● Hitachi
● Volvo
● SANY
● Liugong
● XCMG
● And other standard hydraulic cylinders
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 |
Why Choose SANPING SEAL?
17 Years of Export Expertise
Guangzhou Sanping Machinery Co., Ltd., established in 2009, has served customers across South Asia, Southeast Asia, Africa, South America, the Middle East, and Europe.
Specialized Focus
We concentrate exclusively on engineering machinery high-end seals, ensuring we understand your equipment applications better than general seal suppliers.
Quality Guarantee
Every order follows our two-step quality process: pre-production sample testing before mass production, and final inspection before shipment.
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.
