The seals for hydraulics and pneumatics form the sealing solution for hydraulic and pneumatic cylinders.
The main function of these components is to prevent leakage of the power transmission fluid in single-acting, telescopic or double-acting cylinders, among others.
In our blog post we explain more about our gasket manufacturing service and how to set up a sealing system.
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We manufacture seals for hydraulics and pneumatics
More and more customers require customised sealing solutions. The ability to manufacture seals in a wide variety of profiles and materials as required is crucial.
The seals for hydraulics and pneumatics are manufactured on numerically controlled lathes. At Epidor Seals and Rubber Technology we have lathes that are equipped with a bar loading device for high volume series.
We manufacture and supply small and medium-sized series of seals for hydraulics and pneumatics without mould costs.
We also produce short runs for prototypes in less than 48 hours. These services will be very useful for you if:
- - You have trouble locating seals for hydraulics and pneumatics because they are discontinued.
- - They require a minimum quantity of sealing gaskets to be manufactured far in excess of your needs.
The materials most in demand are:
- - Elastomers (NBR, EPDM and FPM).
- - Polyurethanes.
- - PTFE with fillers (glass fibre, bronze, graphite, ekonol, PEEK, etc...)
Optionally, dimensional analysis of customer-relevant dimensions such as, for example, the external diameter of the part, the part height and internal diameters (in case of having several of them) can be carried out.
In the catalogue “Machined Seals - Tailor-made seals”You will find the current models that make up the manufacturing programme for hydraulic and pneumatic seals, as well as information on the materials available for the machining of parts.
In addition, we are capable of producing seals for hydraulics and pneumatics in 60 materials which are then examined in detail in a later section. our own laboratory.
On numerical control lathes we manufacture all kinds of seals for hydraulics and pneumatics for the sealing of hydraulic and pneumatic cylinders: scrapers, collars, low friction seals, compact seals, guides, support rings, etc...
Sealing system configuration
Each of the seals for hydraulics and pneumatics, will have its own importance in the sealing of the hydraulic or pneumatic cylinder of interest. And they can even be combined with each other in what we call the sealing system configuration, of which we distinguish 3 groups of parts:
- • Stem seals, We include the scraper, collars, guides and low friction seals.
- • Piston seals also consisting of collars, guides, low friction seals and compact seals.
- - The static joints are parts which, as their name indicates, refer to the static sealing of the various mechanical components of the cylinder. O-rings, X-rings and support rings belong to this group.
Stem seals
The first piece to comment on is the scraper. (2). Its main function is to prevent any dirt that may have settled on the surface of the piston rod from getting inside the cylinder.
We refer to the dust or humidity around the hydraulic or pneumatic cylinder. This part is located on the outermost part of the cylinder, as shown in the picture above.
Next, we find a collar (5) and a low friction seal (6). Depending on working conditions, the design of the parts can be modified and combined, The low friction seals, e.g. two low friction seals instead of a collar and a low friction seal as shown in the picture below:
The guides (7) play a key role in preventing metal to metal contact, when collars and low friction seals are worn.
If guides were not installed, there would come a time when the piston rod would no longer be able to move due to seizure or contact of the metal piston rod with the metal cylinder head.
Piston seals
Like the piston rod, the main seal that provides sealing between the piston and the cylinder liner is either a collar or a low-friction seal. (9).
The piston also has guides that perform the same function as on the piston rod, in addition to the correct alignment of the moving assembly. (8).
And there are even pistons that combine the guide and the seal in the same part, in what we call a compact part, such as the DK 109, for example.
The white parts act as guides, while the blue part is the sealing ring.
Static seals
They provide sealing between the cylinder head and the cylinder liner, or between the end of the piston rod and the threaded piston.
They are pieces that are not exposed to surface movement against which they provide sealing. Among the static seals, the most common are O-rings, X-rings and rectangular section seals.
We also have parts known as “support rings” which are added to the static joints in order to avoid extrusion damage, The O-ring is used when the piston is subjected to high pressures (> 250 bar). In the enlargement of the O-ring installed between the piston and the piston rod, a yellow part can be seen, which is the support ring. (3).
For more information, please consult OUR WEBSITE or, please contact our Technical Dept. where they will advise you on your application.