The seals for hydraulics and pneumatics are 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 fabrication service and how a sealing system is configured.
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We manufacture seals for hydraulics and pneumatics
More and more customers require customized sealing solutions. To this end, it is crucial to have the capability to manufacture seals in a wide variety of profiles and materials as required.
The seals for hydraulics and pneumatics are manufactured on numerical control 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 series of seals for hydraulics and pneumatics without mold cost.
We also produce short series for prototypes in less than 48 hours. These services will be very useful for you if:
- - You are having 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 most demanded materials are:
- - Elastomers (NBR, EPDM and FPM).
- - Polyurethanes.
- - PTFE with fillers (fiberglass, bronze, graphite, ekonol, PEEK, etc...)
Optionally, dimensional analysis of customer-relevant dimensions such as part outside diameter, part height and inside diameters (if several of them are available) can be performed.
In the catalog “Machined Seals - Tailor-made Sealing”You will find the current models that make up the manufacturing program 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 the following sections. our own laboratory.
On numerical control lathes we manufacture all kinds of seals for hydraulics and pneumatics for sealing 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 configuration of the sealing system, of which we distinguish 3 groups of parts:
- • Stem seals, The product range includes the scraper, collars, guides and low friction seals.
- • Piston seals also consisting of collars, guides, low friction seals and compact seals.
- - The static seals 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 dirt that may have been deposited on the surface of the piston rod from getting inside the cylinder.
We refer to the dust or moisture in the environment of 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 the working conditions, the design of the parts can be modified and combined, The system can be used with 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 low friction seals and collars wear.
If guides were not installed, there would come a time when the rod would no longer be able to move due to seizure or contact of the metal 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 seal in the same part, in what we call a compact part, for example, the DK 109.
The white parts are used 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-ring seals and rectangular section seals.
We also have pieces known as “support rings” that are added to the static joints for avoid extrusion damage, when 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, you can consult OUR WEBSITE or, please contact our Technical Dept. where they will advise you on your application.