Parker 2H/3H Series NFPA Heavy-Duty Hydraulic Cylinders


Parker Heavy-Duty Hydraulic Cylinders

Parker Piston Sealing Technology

Parker’s universal piston seal design facilitates the performance balance between low-pressure sealing, low friction, extrusion resistance, and seal life. One piston style works for all piston seal and wear ring configurations and suits all application requirements.

Application parameters changes (changes in operating temperature, duty cycle, or use of a different fluid) may necessitate changing seal configuration or changing a seal and wear band material in a field. With the common piston design, these changes do not require replacing costly machined components.

All piston options include dual non-metallic wear rings, which provide maximum stability and bearing surface for protection against eccentric loads. Parker’s WearGard™ wear rings are internally lubricated for reduced friction and formulated for heavy-duty load-bearing applications.

Piston Seal Selection Guide

Load Holding Best Good Good Best
Fluid Compatibility Good Best Better Better
Heat Resistance Good (200F Max) Best (400F Max) Better (300F Max) Better (250F Max)
Dynamic Friction Best Best Good Better
Breakaway Friction Good Best Good Better
Extrusion Resistance Good Better Best Good
Fluid Isolation N/A N/A N/A Best


Parker Rod Sealing Technology

Parker offers the best performing and broadest selection of rod sealing options. Their TS2000 threaded Jewel Gland sealing system in Series 2H and Tri-lip Bolt-on Gland in Series 2HD /2HB are proven anchors of the offering.

As the rod strokes out, its motion and friction dynamically flex the multi-sealing edges of the TS2000 and the Tri-Lip rod seal to maintain their contact with the rod. This provides a cutting action to shear the oil from the rod, allowing the rod to pass out of the rod seal practically dry. Any oil film that remains on the rod is stopped by the inner lip of the Wiper seal and held between it and the rod seal.

On the return stroke any dirt or foreign matter collected on the rod is wiped off by the leading edge, or outer lip of the Wiper seal. At the same time, any oil which may be trapped between the Wiper seal and the rod seal is returned into the cylinder. In other words, we have an automatic check valve that prevents any appreciable amount of oil to leak past the seals, and then returns any oil that has managed to wipe by the rod seal.

Both the TS2000 Jewel Gland and Tri-Lip glands are easily removed for service without loosening tie rods and disturbing the pressure envelope. Material options for both glands allow compatibility with Seal Classes 1, 2, 3, 4, 5 & 6.


This document and other information from Motion & Flow Products, Inc (MFCP), the Parker Hannifin Corporation, and other MFCP's suppliers provide product and/or system options for further investigation by users having expertise. It is important that you analyze all aspects of your application, including the consequences of any failure, and review the information concerning the product or system in the current product catalog. Due to the variety of operating conditions and applications for these products or systems, the user, through its own analysis and testing, is solely responsible for making the final selection of the products and systems and assuring that all performance, safety, and warning requirements of the application are met.
The products described herein, including without limitation, product features, specifications, designs, availability, and pricing, are subject to change by MFCP at any time without notice.

Warning Triangle WARNING: These products can expose you to chemicals including lead and/or lead compounds, which are known to the State of California to cause cancer or birth defects or other reproductive harm.  For more information go to