SEALING SYSTEM

The typical environment of a forge shop is particularly aggressive and the press get to be working at a temperature and in a general environment quality conditions which certainly are not likely to  preserve it. The sealings or gaskets mounted in the traditional machines are made of plastic. By working in very difficult conditions and since they get weared out very easily due to their nature, such gaskets do not last very long. As a matter of fact, it is necessary to programm at least one Machine-stop per year in order to replace such sealings. When its sealings get weared out then the press is likely to be no more able to keep the position in which it was installed, get under pressure very hardly and the nominal force of the press is not attended any more. It may happen that a part of the oil leaked from the sealings get into the forging zone and then it is possible to contaminate such area and to make it dangerous since oil is easily flammable. The replacement of sealings in a medium-large sized press can be very onerous under an economical point of view and very complicated and also quite long as far as the Machine-stop duration is concerned. As a matter of fact replacing the wearings present in the pistons' heads requires suitable lifting means and however mounting and dismounting are very delicate operations even if they are carried out by a highly qualified personnel.

The new TDS serie solves radically this matter which is very well know to every forge man in the world. Sealings are made of a plastic material no more! Every sealing easily wearable has been replaced (the ones working under high pressure) with mechanic sealings. Mechanic sealings, the so-called “elastic bands or metallic segments” are granted by Muraro to be lasting at least 30 years in continuous service and without it being necessary to control and/or replace them. The mechanic sealings which are mounted work by the same principle as the ones which the cars' internal combustion motors do use, just imagine how many cycles can the motor perform in a single working year. The difference between the motors' and the presses' pistons is that the first ones work in a dry condition and at a high temperature while the second ones do work at very lower temperatures and get always lubricated by the oil itself. That is the reason why such metal sealings can be granted for so long a time.

As it can be easily understood, the mechanic sealing is not perfectly oil-proof, therefore a small quantity of oil is leaked from the piston, this problem is generally considered to be unaffordable. That is not the case, this is the reason why the TDS series uses a small gear-pump to compensate such leakage and then allows for its suspension at the pre-determined altitude. The consumption of such small pump is quite low on the contrary the benefits arising from such type of sealing