Piston Seals at NewDealSeals
Piston seals serve as the vigilant sentinels of hydraulic cylinders, meticulously tasked with sealing liquids within. Positioned within the cylinder head, these seals form an impermeable barrier against the cylinder wall, preventing any unwanted leakage of liquids beyond the cylinder head.
What Are Piston Seals?
Piston seals are essential components within hydraulic cylinders, meticulously engineered to perform a critical task—maintaining a tight and reliable seal between the piston and the cylinder bore. These seals are designed to prevent the leakage of hydraulic fluids, ensuring the efficient and smooth operation of hydraulic systems.
Advantages of Piston Seals
Piston seals are indispensable components within hydraulic systems, offering a multitude of advantages that enhance their efficiency and reliability. In this SEO-text, we’ll explore the exceptional benefits of piston seals, highlighting how they contribute to smooth hydraulic operations.
- Assembly on One-Piece Pistons: Piston seals are designed for easy assembly on one-piece pistons, simplifying the installation process and ensuring a secure fit.
- Minimal Break-Out and Dynamic Slide Friction: Piston seals are engineered to minimize break-out and dynamic slide friction, eliminating the risk of stick-slip. This guarantees steady movement, even at low velocities, for uninterrupted hydraulic performance.
- Low Wear: These seals exhibit low wear characteristics, contributing to the extended lifespan of hydraulic components and reducing maintenance costs.
- High Extrusion Resistance: Piston seals are built to withstand high levels of extrusion, ensuring reliable sealing even under demanding hydraulic conditions.
- High Temperature Resistance: Engineered for high-temperature environments, piston seals maintain their integrity and sealing efficiency, regardless of temperature fluctuations.
- Chemical Compatibility: Piston sealing rings boast high chemical resistance, making them compatible with a wide range of hydraulic media. Additionally, a diverse selection of O-ring compounds further enhances their versatility.
- Large Diameter Options: Available in diameters up to a remarkable 1500 mm, piston seals cater to various hydraulic applications, including large-scale industrial machinery.
Technical Specifications
Type of movement
Rotary, reciprocating
Surface speed
≤ 4,0 m/s
Working pressure
Standard:≤ 400 bar
In case of reduced extrusion gap (H7/f7):≤ 600 bar
Profile P3:≤ 160 bar
Profile P4:≤ 16 bar
Working temperature
Standard:-30 to +108°C
With FKM O-Ring:-25 to +204°C
Profile P4:-30 to +80°C
Standard materials O-Rings
NBR, FKM
Standard materials Piston Seals
Profile P1: NDS-150, PTFE modified, NDS-66-, PTFE + 60% bronze
Profile P2:NDS-123, PTFE 15% glass + 5% molybdenum disulfide, NDS-150, PTFE modified, NDS-660, PTFE + 60% bronze
Profile P3: NDS-150, PTFE modified
Profile P4:
NDS-225, PTFE + 25% carbon
Profiles Piston Seals
PROFILE P1
For single-acting pistons in hydraulic cylinders
Profile P1 is particularly suitable for single-acting pistons in control cylinders, in servo controlled systems, machine tools and in construction machinery. Optimal sealing performance obtained if used in tandem with Guide Ring.
Good back-transport of oil film due to special shape of sealing edge.
PROFILE P2
For double-acting pistons in hydraulic cylinders
Profile P2 is suitable for double-acting pistons in control cylinders, servo-controlled systems, machine tools, quick acting and steering cylinders.
Capable of sealing dynamic pressure from both sides (bidirectional) at high pressure.
PROFILE P3
For dynamic applications
Profile P3 is appropriate for dynamic applications as an alternative to an O-ring in situations where sealing performance and friction have to be optimised.
Can be used in existing O-ring grooves.
PROFILE P4
For double-acting in pneumatic cylinders
Profile P4 is suitable for double-acting pneumatic pistons, e.g. in control cylinders, servo assisted equipment, and in quick-acting cylinders.
Can be used for pneumatic applications.
PTFE COMPOUNDS
| Color | Temperature | Application | Information | |
|---|---|---|---|---|
| NDS-100 PTFE-virgin |
White | -190 to +230 °C | Chemical Industry, Food Industry | High chemical resistance Datasheet |
| NDS-123 PTFE +15% glass, +5% molybdenum disulfide |
Grey | -190 to +290 °C | Medium-duty | High chemical resistance, High creep resistance, Electrical properties like virgin PTFE Datasheet |
| NDS-225 PTFE +25% carbon |
Black | -190 to +315 °C | Pneumatics Rotary sealing | High wear and creep resistance Datasheet |
| NDS-235 PTFE +10% carbon fibre |
Black | -260 to +310 °C | Water hydraulics, Seawater, Short strokes with high frequency | Very good wear properties Datasheet |
| NDS-430 PTFE + 23% carbon + 2% graphite |
Black | -100 to +250 °C | Medium-duty, cold creep, thermal conductivity | Chemical and wear resistance Datasheet |
| NDS-555 PTFE + mineral fibers |
Antrachite | -200 to +260 °C | Medium and heavy mechanical stress, Hydraulic applications | Chemical, wear and creep resistance Datasheet |
| NDS-640 PTFE +40% bronze |
Bronze | -156 to +260 °C | Medium and heavy mechanical stress, Hydraulic applications |
Outstanding wear and creep resistance
|
| NDS-660 PTFE +60% bronze |
Bronze | -156 to +260 °C | Heavy mechanical stress, Hydraulic applications | Outstanding wear and creep resistance |
| NDS-750 PTFE + polyimide |
Tan | -260 to +310 °C | High speed rotating applications | Use against soft metals |
Related PTFE Seals
Back-up Rings
Rotary Seals
Spring Energized Seals
CONTACT FORM
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NewDealSeals B.V.
+31 (0) 226 362 233
Boezemschop 8, Breekland, 1724 BJ Oudkarspel, The Netherlands