Seals. Image for O RINGS. O RINGS. Image for ARTIC HYDRAULIC & PNEUMATIC SEALS. ARTIC HYDRAULIC & PNEUMATIC SEALS. Image for FFKM O. Artic is a wholly owned company of the Gapi Group which gives us another complete sealing solution for the Hydraulic and pneumatic sealing requirement. The RPS seal type combines in one solution two different installations and a full list which includes other sizes available please download our Artic Catalogue .
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This chapter deals with the sealing of fluids on rotating shafts, a delicate problem that now finds its almost universal solution in the application of a product known as a “rotary shaft seal”. The entire discussion is destined for designers and users, as sealls valid support and guidance for selecting the most appropriate type for their specific uses.
The shape of the “rotary shaft seal” is shown in the figure belowe, which also supplies the recurrent nomenclature for the component parts of the ring. The material used for the sealing lip is a mixture of one or more basic elastomers and a variety of ingredients, such as: This is for the purpose of providing it with gpi properties, such as:. A familiarity with the materials is essential to help the designing specialist make the proper selection of the most suitable materials for the application of interest.
The main qualities of the compounds ROLF uses for producing its shaft seals are:. The most widely used elastomer in most current applications. It is particularly recommended in case of contact with: This elastomer is recommend for use with: Due to gapo chemical composition high molecular weight chains of appropriately modified polysiloxanesthis series is particularly resistant toward atmospheric agents, light and ozone.
It also exhibits an excellent high- and low-temperature resistance, so that weals field of application covers a broad range. Despite its less than fully satisfactory tear and abrasion strength, its low friction coefficient amply compensates for the relative effect.
It is recommended for: Never use with petrols.
This elastomer has exceptional heat and chemical resistance. It offers excellent performances in contact with: Its resistance to oils and solvents is on average slightly superior to that of nitrile rubber, except for special cases.
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It is therefore recommended for: This rubber is based on ethylene-propylene plus a third diene monomer which allows its reticulation with sulphur. Due to its chemical structure, it has a peculiar resistance to fluids such as water and steam and environments such as ozone, which recommends its use for: The thermal expansion coefficients of elastomers are decidedly superior to those of metals see Table belowe.
It is impossible, therefore, to merely consider the geometric shape of a shaft seal and its total radial load at ambient temperature, because its operating conditions and lifetime may substantially vary, depending on the change of the modulus of elasticity induced by a temperature change. Its function is to offer the shaft seal the necessary rigidity to enable a stable coupling with its relative housing seating.
With reference to the elastomer, it may be of an inner see par. This solution includes the following advantages: This type of case was designed for applications requiring high pulling forces and automated motions based on magnetic systems. In time, it has also been catzlogue that in order to achieve a reliable seal, a ground outer finish and a finely machined seating was needed in catalogie to the use of sealing materials.
Its cost was considerably higher than that of a coated type. It was therefore decided to use it only in combination with high-quality compounds, where most of the catalkgue increase is compensated by the savings in elastomer materials. At any rate, ROLF solved the problem by producing its seals with their outer surface coated only up to half of its height, as detailed below.
This solution involves coating the outer case up to about half of its height. This coating is a result of vulcanization and can be plain or corrugated to better fit the assembly forces required by the customers. The resulting advantages are: The spring has a function that is complementary to the fundamental action provided by the sealing lips.
In fact, heat, mechanical deformation and chemical action of the fluids affect the original properties of the rubber.
As a result, the original radial force exerted by the sealing element tends to catalogie. The function of the spring is to counteract this tendency. The spring is a closely wound helical spring in toric form and possesses a calculated initial pre-loadinging force. This is supplemented by a stabilizing heat treatment performed at a higher temperature than the operating one, which makes it possible to achieve: The temperature effect actually determines, in the course of time, not merely an alteration of the rubber’s original characteristics, but also weals decrease of the mechanical properties of the steel constituting the spring.
The choice of the materials constituting the spring depends on the type of fluid the Garter spring comes in contact with. In the standard version it consist of a phosphatized, high strength piano wire steel to UNI or DIN standards.
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The standard springs undergo a programmed bedding-in process which allows a precise evaluation of the radial force at the design stage.
The use of springs of different material may be considered for particular applications. For instance, in cases requiring gapk seal against corrosive liquids such as seawater, detergent or acid solutions, a stainless steel spring can be employed, conforming to the following standards: The use of phosphorous bronze springs, while having the same chemical resistance as stainless steels, is not recommended because of the instability of its dimensional characteristics and the uneven decay of its load capacity.
Send your drawings for quote or call to discuss product or material design perimeters with our engineering department. Seals – Oil Seals. The typical fundamental components of a shaft seal are: This is for the purpose of providing it with certain properties, such as: The main qualities of the compounds ROLF uses for producing its shaft seals are: We can supply custom molded o-ring gaoi in any material and in virtually any shape or size.