33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
Advantages and Application Areas of SPGO
一. Core Advantages
Dimension of Advantage |
Performance Characteristics |
Technical Principle |
Comparison with O-Rings / Conventional Seals |
① Low Friction & Stick-Slip Free |
Extremely low friction coefficient, no stick-slip during start-up; suitable for micro-speed precision control (e.g., servo cylinders) |
Primary sealing ring made of filled PTFE with self-lubricating properties; O-Ring provides static preload only |
O-Rings involve rubber contact, high static friction, prone to stick-slip at low speeds |
② High Pressure Resistance & Extrusion Resistance |
Withstands pressures up to 40 MPa (~5,800 psi), some specifications exceed 60 MPa; allows larger radial clearance, no need for additional backup rings |
Stepped PTFE ring combined with O-Ring back-pressure energizing structure; extrusion resistance far superior to pure rubber seals |
O-Rings are highly prone to extrusion under high pressure; backup rings are mandatory |
③ Wide Temperature Range & Broad Media Compatibility |
Temperature range: -45°C to +200°C (depending on O-Ring material); compatible with mineral oils, water, air, fire-resistant hydraulic fluids, etc. |
PTFE is chemically inert; O-Ring materials can be selected (NBR, FKM, HNBR, etc.) to suit media |
EPDM is not oil-resistant; standard NBR upper limit is only +100°C |
④ Compact & Integrated Design |
Short axial groove dimensions, suitable for one-piece pistons, reducing total cylinder length |
Single sealing element achieves bi-directional sealing; eliminates need for seals on both sides |
Traditional bi-directional sealing requires two sets of U-cups or complex structures, occupying significant axial space |
⑤ Long Service Life & Contamination Tolerance |
Excellent wear resistance, suitable for media with slight contamination; unlimited shelf life for PTFE (O-Ring typically 7 years) |
PTFE has high hardness and wear resistance; larger extrusion gap allows fine particles to pass without damaging the seal |
Rubber seals are sensitive to contaminants and prone to scoring |
Special Note: Some sources indicate SPGO is also used in rotary shaft seal applications (spring-loaded dual-lip designs), primarily for grease or oil-lubricated rotary conditions in gearboxes, axles, etc. This suggests the SPGO series has two branches: bi-directional piston seals and rotary shaft seals, which should be confirmed based on the specific model.
二. Typical Application Areas
1. Mobile Hydraulics & Construction Machinery
Equipment: Excavators, loaders, forklifts, bulldozers, cranes, agricultural machinery
Operating Conditions: High pressure (often >30 MPa), shock loads, wide temperature ranges, outdoor dusty environments
Why SPGO: Extrusion resistance, contamination tolerance, integrated bi-directional sealing, suitable for high-frequency reciprocation
2. Industrial Hydraulics & Machine Tools
Equipment: Injection molding machines, presses, die-casting machines, hydraulic presses, machine tool feed cylinders
Operating Conditions: High-frequency response, high speeds (up to 5 m/s), precise position control
Why SPGO: Low friction, stick-slip free, high speed adaptability, high repeatability positioning accuracy
3.Special Media & Operating Conditions
Accumulators & Gas-Liquid Isolation: Piston accumulators, pressure holding cylinders requiring bi-directional isolation of different media (oil/gas)
Water Hydraulics & Fire-Resistant Fluids: PTFE is hydrolysis-resistant; combined with FKM O-Rings, suitable for water-glycol, emulsions, etc.
High-Speed Applications: Speeds up to 5 m/s, significantly higher than standard U-cups (typically ≤0.5 m/s)
4. Heavy-Duty & Large Diameter Applications
Metallurgical Equipment: Rolling mills, forging machines
Marine & Offshore: Steering gears, lifting cylinders
Large Diameter Pistons: SPGO structure is insensitive to diameter, easy to manufacture, suitable for large bore cylinders
5. (Special Branch) Rotary Shaft Seals
Applications: Gearboxes, axles, engine crankshaft rear oil seals, etc.
Technical Features: Metal spring provides constant radial force; PTFE lip resists high temperatures and dry running
Welcome to HOVOO, a Chinese seal factory. Production of PU, Rubber and PTFE seals. The seals include O-ring, piston seal, rod seal, Gray ring and gas seal.
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