Double-Acting Piston Seals OK Profile

OK Profile Piston Seals for medium to heavy-duty double-acting hydraulic piston seal applications

OK Profile Applications
Designed for higher temperatures and pressures, the OK Piston Seals are recommended for heavy-duty hydraulic applications. The OK sealing assembly is suitable for working pressures up to 7250 PSI (500 bar) and above in some specific situations. The Piston Seals OK Profile is an effective and less expensive alternative to costly capped T-Seals and PTFE loaded cap seals.

Advantages of Piston Seals

• Lower installation costs
• Piston Seals with extended seal life
• High extrusion resistance at high pressures and large gaps due to the special compound properties of the cylinder sealing ring
• Piston Seals are resistant to high shock loads
• Low break-out and running friction even after lengthy stand-still under high pressures
• High abrasion resistance Piston Seals
• Premium static and dynamic sealing function
• Small profile
• Suitable housing according to ISO7425 -2
• Passes over ports without nibbling or extruding

Field of application
Working pressure:      7250 psi (500 bar)
Working temperature: -40° F to 250° F
Surface speed:          3.28 f/s (1 m/s)

Ease of Installation
This durable two-piece seals are designed to be compressed in the bore upon installation to minimize seepage at the gap. The OK piston seal s split design facilitates its installation on solid pistons without the necessity of auxiliary tools. The OK Profile can be snapped into closed-groove spaces. Note: The installation groove must be carefully deburred and cleaned of all foreign material. The cylinder bore must have a leading edge chamfer.

Compound formulated to extend seal life
The cylinder seal ring is produced of W4650, a glass reinforced nylon. The tensile strength and flexibility exhibited by W4650 provides maximum stretch during installation. Other beneficial characteristics of this material include the ability to capture and contain system contaminants such as metal chips, excellent compressive strength and the ability to resist extrusion or chipping when passing over cylinder ports. (See W4650 Physical Properties Table)

Expander Ring
This is an NBR-based elastomer with 70 shore A hardness. The rubber expander ring provides good compression set resistance which in turn increases potential seal life.