Still Sealed

The most common fluids used in hydraulic systems are based on mineral oil. In recent years, there has been a great concern for the environment acceptable hydraulic fluids, but their use so far is limited, mainly because of their relatively high cost compared with mineral oil. In many cases, standard seals alternative can be used in these fluids. Fire resistant fluids, such as high water based fluids, have applications in specific sectors such as mining long wall and having led to the evolution of specialized seals, but the vast majority of applications use mineral hydraulic oil. Two main factors that affect systems based on mineral oils are the costs and losses.
This article considers two key issues: —
• The effect of finishing on the performance of the tube seal – the tube that low cost can not give the desired results
• The influence of the wiper on the leakage from the gland

L 'EFFECT TUBE FINISH the seal PERFORMANCE

A seal of the piston of a hydraulic cylinder is only part of the seal. His life will depend on a number of factors, one important is the nature of the surface against which it is running. Steel tube hydraulic cylinder typically have a surface finish that is produced in a of three ways: —

• sanding
• roller-burnishing
• drawing on a mandrel (DOM)

Seals Hallite have done important studies on performance double seals in quality, used both in a double acting and single acting examine the effect of the method fabrication of the pipe and thus the surface structure of the tube, the performance of a typical double-acting piston seal.

Cylinder Tube Manufacture

Tubes hydraulic cylinders are generally made of steel, which is made on a mandrel (DOM). This process work hardens the material and gives it desirable mechanical properties. The final surface of the tube is obtained in one of three ways. In the process of polishing the tube is worked to obtain the necessary softness and tolerance hole and to remove surface imperfections, then finished internally grinding or sanding. In Bevel and roller-burnished tube back inside the tube is processed (blunted) and crushed rollers on the head of processing. More recently, design techniques have been developed so that the pipe is considered ready for use in the state, as defined. This is known as a special smooth inside diameter (SSID) or 'smooth bore' tube.

In terms of cost of the finished tube from the ranking the cheapest and SSID DOM, rolled and polished. SSID Sun pipe can be 30% cheaper than rolls, so its attractions for the manufacturer of the cylinder are evident. However, the quality of these tubes can be a problem that could lead to premature seal failure.

The limits of As-Drawn (SSID) Tube

SSID tube was found to have limitations in application, especially when the double acting plunger is guided in pressure. This can happen For example, when lowering a load is controlled by the release of liquid from full bore. The manufacturing process of the results of the tube, as set in the axial – score of the tube, tube roller-burnished and polished, these defects are eliminated from the finish of the tube in a circumferential direction. These scores can provide axial sites for fluid jet above the seal erode the surface of contact, particularly when the seal is being driven under pressure. A further difficulty is that these defects are not detected by the usual methods of measuring surface finish.

THE INFLUENCE OF LOSSES ON WIPER GLAND

Gland system closure of a hydraulic cylinder consists of a number of factors, including the locations of seal, the seal, the wiper shaft, bearing shaft, the hydraulic fluid and the auction itself. Auctions are usually relatively constant and chrome finish. The wiper shaft has the primary function of preventing external contamination to reach the seal and bearings of the gland, and for this reason it is mounted, the vast majority of hydraulic cylinders. However, this component was often omitted from the laboratory testing of piston seals.
Extensive studies have been conducted on the factors affecting performance of reciprocating seal even the counter-face surface finish and the effects of contamination.

Hallite Seals made a series of tests where the performance loss of five different wipers work with a wand the common seal was evaluated in polyurethane. And 'demonstrated that he is an important factor for the wiper control leakage from the gland hydraulic cylinder. Single lip wipers can give a dispersion much greater than the seal, by itself, without a windshield wiper. This is the result of the lip erase collect oil the Rod, which provides boundary lubrication of seals. The use of double lip wiper reduces the loss at the level of that of a seal on its own, but there a danger of pressure between the seal and the capture wiper. Double lip wiper profile has been developed, which minimizes the ring on the stem of oil collected wiping lip, and functions as a vent to release the oil in the case of a build up of pressure between the seal and wiper.

About the Author:

Hallite Seals International are an ISO 9001 accredited manufacturer and provider of Hydraulic Seals and sealing solutions to the global fluid power industry. We operate in all five continents of the world, and work with a number of major international brands – renowned for their commitment to engineering excellence.

For over 100 years Hallite Seals International has been at the cutting edge of fluid power technology, manufacturing a wide range of rod / gland, piston, and static seals, as well as support and bearing components, for technically challenging applications, from a wide range of materials which include Polytetrafluoroethylene (PTFE), Polyurethane (AU), nitrile rubbers (NBR) and Fluoro-elastomers (FKM).

Article Source: ArticlesBase.com – Reciprocating Seals for Hydraulic Cylinders

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