Compact spiral hose

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Parker Hannifin’s Compact Spiral hose, offers benefits of weight reduction, space savings, flexibility, a tighter bend radius, wider fluid compatibility and longer life.

The company claims this is the most significant new development in the market since spiral hydraulic hose was introduced.

Traditionally, SAE J517 provided guidelines for hydraulic 100R series hoses based on hose construction (R1 through R12).

More recent additions to this standard include constant pressure hoses, such as R13, R15, R17 and R19. In recent years, however, the trend has been away from SAE in favour of ISO specifications.

Parker’s Compact Spiral hydraulic hose series is designed to meet the constant pressure classifications of ISO 18752, including the most stringent Grade D, Type DC classification.

In response to market trends for higher-pressure hoses, Parker developed the new Compact Spiral hose to provide OEM customers with the performance of a spiral hose, but with the characteristics of a braided hose – lighter weight, high degree of flexibility and tighter bend radius. In addition, the new hose is said to provide longer life.

The “TC” designation in the hose part number signifies that it is a Parker “Tough Cover” hose that is abrasion-resistant to deliver long service life in rigorous and/or remote installations.

Together with the introduction of the Compact Spiral hose, Parker is also introducing the 77 Series fittings. This fitting series is equally significant as it features a common design for both 787TC and 797TC hose.

Made with a one-piece metric hex with Interlock No-Skive Bite-the-Wire technology, the new fittings require less “push-in” force, and provide cool down leakage performance. The 77 Series fittings are available with many different end configurations for use with 787TC and 797TC hoses.

Parker’s Compact Spiral hose series is designed to meet the constant pressure Grade D and Type DC classification in ISO Standard 18752.

Many major companies have already switched to ISO standards in their design and manufacturing processes to ensure the sale and service of their equipment globally.

The ID of 787TC and 797TC Compact Spiral hose is the same as common SAE spiral hoses, ensuring consistent performance and flow characteristics in a hydraulic system.

What has changed, however, is the external size of the hose. Parker’s development, application and use of a proprietary new high-performance inner tube has made it possible to refine, redesign and significantly reduce overall hose dimensions.

This enables equipment specifiers to move up one hose dash size – such as from a traditional size -8 to size -10, or size -10 to size -12, without needing more room.

The +24% overall area savings and smaller OD results in:
• Tighter routing in new system designs
• Improved hose flexibility
• Industry’s lowest bend force, equating to ease of routing, installation and improved ergonomics

Along with the unequaled flexibility of Parker’s Compact Spiral hose comes a tighter bend radius; a quantifiable savings, since less hose is needed to make port-to-port connections.

For new designs, the reduction in bend radius makes it possible to place key components – such as the pump and valve – closer together so that the complete unit can be built more compactly. This means designers will have considerable freedom and ability in configuring their equipment.

With a smaller OD hose, designers will have additional roomto fit hoses into a limited amount of space.

Since the new hose is also smaller and weighs less, installation is simplified. Traditionally, spiral hydraulic hoses are stiff and heavy. Installation of a hose assembly is hard work – pulling the hose through the equipment and moving it up into place can be quite burdensome.

Such installations may require two or three people to accomplish the job. The new Compact Spiral hose, with its greater flexibility and lighter weight, makes it possible to reduce installation time and manpower.

Key to the design success of the new Compact Spiral hose is a patent-pending Nitrile-based inner tube compound that is both stronger and thinner than what has been traditionally used in standard spiral hose.

The overall strength properties of the new inner tube compound are such that it is possible to have the same ID yet reduce the overall OD and size without sacrificing the pressure and sealing capabilities.

In addition, the reduced tube wall thickness provided the opportunity to proportionally redesign the wire reinforcement, which led to an additional reduction in the hose OD.

The new inner tube compound also features improved heat aging and enhanced fluid compatibility. While actual hose life depends on the fluid used, temperature and operating conditions, Parker’s data indicates that Compact Spiral hose life will be vastly improved compared to that of standard spiral hose.