MXPA99002097A - Subassembly for an internal combustion engine - Google Patents

Abstract

Disclosed is a subassembly for an appliance driven by an internal combustion engine, the components of which are assembled in the form of a module (1), with the fastening means to associate the module to the internal combustion engine.

Description

Component group for an internal combustion engine The present invention relates to a component group for an apparatus operated by an internal combustion engine according to the exordium of claim 1. "'Such component groups are known by way of example from German patent document DE PS 533 732 , in which an oil filter is equipped with a cooler for internal combustion engines, having provided a double wall housing with an internal chamber containing a filter arrangement at discretion from which the purified oil passes into the outdoor chamber Furthermore, a component group of this type is known from German patent DE 1 020 831, in which a device for the treatment of oil and coolants in internal combustion engines, particularly lubricating oil, is illustrated. and cooling water, using an oil filter and a coolant filter, and the casing being enclosed of the oil filter through a jacket through which the cooling fluid circulates.

In case it is desired to apply such component groups in modern motor vehicles or in other apparatuses operated by means of internal combustion engines, it is disadvantageous that the known component groups have relatively large external dimensions, as well as a correspondingly high own weight, or Construction is so costly that it can not be done for economic reasons. The present invention therefore has the purpose of improving a component group of the type initially mentioned so as to obtain a component group that is easier to manufacture and to assemble, be lighter and more economical, always ensuring safe operation. According to the present invention said purpose is satisfied by the fact that component elements are grouped to a module and means have been provided with which the module can be connected to the internal combustion engine. In this case, it is advantageous that both the manufacturing costs of the different functional units and the costs of the final assembly can be reduced.

Due to the uninterrupted construction synergies are achieved between the different functional components, which contributes to the reduction of costs. The provision of modules for final assembly also simplifies logistics. The modular construction of the constructive unit also manifests favorably on the recycling of these component groups. The grouping of the functional units to a module also allows a quick reaction to satisfy the concepts of the market permanently in change. A particularly advantageous development of the present invention provides that a support body is integrated in the module, which can be connected to the internal combustion engine and in which the component parts of the module are fixed. This support body gives the module a structure, which on the one hand defines the connection of the module with the internal combustion engine, as well as the arrangement of the different component parts of the module. In this context, the support body houses both the filter and the cooler, which leads to cost savings in terms of tools. In case both the cooler and the filter are housed in the same housing, only one tool is required for its manufacture. Another particularly advantageous development of the present invention provides that the module contains as component parts substantially an oil cooler (3) and a filter (4), which are grouped into a single functional unit, which leads to both weight reductions and also to economic savings. In a particularly advantageous development of the present invention, it is provided that the oil cooler is constituted by a countercurrent exchanger since this type of cooler guarantees in the case of the integration described above an oum capacity and heat exchange referred to the spatial dimensions. An advantageous development of the present invention provides that the module is expandable with additional component parts. As an example, the integration of all the current conductors in this module would be imaginable, such as, for example, cooling water hoses. Furthermore, it can advantageously be provided that the module t-s: comprises as an additional component part at least one check valve and / or at least one bypass valve, which also contributes to an increase in the integration density of the component group. In other particularly advantageous developments of the present invention it is provided that the housing of the oil cooler serves as the support body of the module, with which the module can be linked to the internal combustion engine, since it has a certain basic resistance. A particularly advantageous development of the present invention provides that at least one component part of the module is constituted of plastic material. It is also conceivable to carry out in its entirety the module and its component parts of plastic material, the plastic being provided so that it is thermally conductive, particularly in the area of the cooling fin. The embodiment of the module in plastic material leads inevitably to a reduction in costs and a reduction in weight, as well as subsequently a reduction in fuel consumption of the internal combustion engine during operation. An advantageous development of the present invention provides that a check valve, which substantially comprises an elastomeric ring (5) in an approximately annular shape, which is disposed between an oil cooler (3) having oil outlet openings (6). ) and a filter element (7) of substantially annular shape, the washer (5) being tensioned and fixed so that in case of return all the oil outlet openings (6) of the oil cooler (3) are closed. An embodiment of this type ensures a smaller constructive height in comparison with the known embodiments. Advantageously, it can be provided that the washer of the check valve is cut off from a sleeve, which can also take place conically, this solution being more economical compared to the injected variants. The materialization of the elastomer washer resistant to high temperature oil or silicone rubber ensures reliable operation of the check valve through the entire service life of the component group., - "These and other features of preferred developments of the present invention are detached, in addition to claims, also of the description and drawings, being able to be materialized the different characteristics in each, case by themselves or several in the form of sub-combinations in the embodiment of the present invention and in others fields, and representing the same protectable realizations by themselves, for which protection is claimed. I Figure 1 illustrates a cut through a group component with a meander-shaped cooler according to line A-A of figure 2.

- Figure 2 illustrates a plan view on the cooler of figure 1.

Figure 3 illustrates a section through a module with a tubular cooler according to two variants.

Figure 4 illustrates a cut through a module with plate-shaped cooler.

Figure 5 illustrates a view of the module according to figure 4 from the internal combustion engine.

Figure 6 illustrates a cut through a module with plate-shaped cooler. Figure 7 illustrates a view of the module of Figure 6 from the internal combustion engine. Figure 8 illustrates a cut through a module with a laterally integrated cooler. Figure 9 illustrates a view of the module according to Figure 9 from the internal combustion engine. The module 1 is constituted by a support body 2, which constitutes in the embodiment example illustrated in FIG. 1 simultaneously the housing of the oil cooler 3, as well as the housing of the filter 4. The inner filter chamber 34 is separated of the inner chamber of the cooler by an elastomeric washer 5 so that said washer 5 acts as a check valve, said washer 5 allowing the oil to circulate from the cooler 3 to the filter 4 and preventing circulation in the opposite direction. The oil coming from the cooler 3 passes through oil outlet openings 6, which are elastically by the washer 5, the washer 5 being displaced and the oil passing to the filter chamber. A filter element 7 is arranged in the filter 4, which releases the oil of impurities. The component group or module 1 is fixed by means of eyelets 9 and screws 10 with the internal combustion engine not illustrated. Since within the maintenance intervals the filter element must be exchanged from time to time, a cover 11 is provided in the module 1, which seals the housing by means of a cover gasket 12, having been fitted according to The embodiment of FIG. 1 shows a bypass valve in the cover so that the center and fix by means of the support tube thereto as well as the filter element 7. The joint 13 of the support tube closes in turn in the support tube 14 to the inner filter chamber with respect to the oil outlet. Through the water inlet 15 the cooling fluid enters the oil cooler 3, which is materialized as a countercurrent cooler in the shape of a meander. Once the water has flowed through the oil cooler 3, it exits again from the oil cooler through the water outlet 16. On the other side of the oil cooler 3, which is sealed with respect to the side of water, the oil circulates through the oil inlet 17 towards the cooler 3 and leaves it, after having circulated through the meander-shaped cooler, through the oil outlet openings 6 towards the inner chamber of filter. After passing through the filter element 7, which separates the unfiltered oil side from the filtered oil side, the filtered oil is again supplied by the oil outlet 19 to the lubricating oil circuit of the internal combustion engine. For the case that the filter element 7 must be replaced for maintenance purposes and residual oil be found in the filter chamber, it may flow through the oil drain 18 back to the oil pan not shown in the internal combustion engine. The oil pipeline 20 is hermetically separated from the water pipeline 24 by means of a cooling fin 21 which has, on its side facing the internal combustion engine, a flat sealing edge 22. To supply all oil in a guaranteed manner the lubrication points of the internal combustion engine, the module illustrated in Figure 1 is equipped with a bypass valve 23, which allows in case the oil is too viscous to flow through the cooler 3, it is derived and can flow directly into the filter chamber 34. This embodiment presents another bypass valve 25, which allows in case the filter element 7 is too clogged with impurities or when the SLceite is too viscous to be able to flow through the filter chamber. filter element 7, that the oil can avoid said filter element and flow directly, that is to say without being filtered, by the interior of the tub or support 14 towards the oil outlet 19. The module 1 illustrated in figure 2 comprises a support body 2, which constitutes the housing of the oil cooler 3 as well as the filter housing 4 not visible therein. In this context the elastic washer not illustrated allows the oil coming from the cooler 3 to flow through the outlet openings 6 towards the non-visible filter, preventing however the circulation in the opposite direction. The component group or the module 1 is fixed by means of fastening eyelets 9 and screws 10 with the internal combustion engine not illustrated. Through the water inlet 15 the refrigerant fluid enters the oil cooler 3, which is materialized as a countercurrent cooler in the shape of a meander. After the water has circulated through the oil cooler 3 in the counter-clockwise direction along the arrow shown in figure 2, it exits again through the water outlet 16. On the other hand side of the oil cooler 3, which is sealed by the cooling fin 21, the oil enters through the inlet 17 to the cooler 13 and leaves the latter after having circulated through the cooler configured in the form of meander in the clockwise along the direction of the arrow, through oil outlet openings 6 passing to the inner filter chamber 34. Once the oil has passed through the non-visible filter element 7, the filtered oil is supplied through the oil outlet 19 back to the lubricating oil circuit of the internal combustion engine. If the filter element 7 is to be replaced for maintenance purposes and residual oil is found in the filter chamber, said residual oil flows through a drain 18 to the oil sump not shown in the internal combustion engine. The oil duct 20 is hermetically separated from the water duct 24 by means of a cooling fin 21, which has a flat sealing edge 22 on the opposite side of the internal combustion engine.

For the guaranteed supply of oil to all the lubrication points of the internal combustion engines, the module illustrated in figure 1 is provided with a bypass valve 23, which in case the oil is too viscous to be able to flow through the vent 13, it allows the oil to be diverted and flow directly into the filter chamber. The exemplary embodiment has another bypass valve 25, which in case the filter element 7 is clogged with impurities or in case the oil is too viscous to be able to flow through the filter element 7, can be derived and flow directly , ie in unfiltered form, inside the support tube towards the oil outlet 19. 1 module 1 is constituted by a support body 2, which in the exemplary embodiment shown in figure 3 according to two variants constitutes simultaneously the housing of the oil cooler 3, as well as the housing of the filter 4. The inner cooling chamber of variant I is separated by means of a corrugated sheet tube in the form of a spiral, which "acts as a cooling fin". , so that the oil channeling and the water channeling are mutually separated in a sealed manner with the cooperation of the sealing faces 22 provided by both extr emos of the tube of sheet metal. The difference with respect to variant I is given in variant II by the configuration of the tubular-shaped cooler. The cooling plate formed in tubular form has, in variant II, projecting patterned portions running in a mutually parallel manner, which on the one hand improve the cooling effect and on the other hand ensure a forced current. In the variant 2, the oil channeling of the water channeling is separated in a sealed manner by means of said tubular sheet and the sealing faces 22 mounted at both ends of the tubular cooling plate. The oil coming from the cooler 3 passes through oil outlet openings 6 towards the filter chamber 34. In the filter 4 there is a filtering element 7, which filters the impurities contained in the oil. The component group or module 1 is fixed by means of fastening eyelets 9 and screws 10 with the internal combustion engine not illustrated. Since within certain maintenance intervals the filter element must be exchanged from time to time, a cover 11 is provided in the module 1, which seals by means of a gasket, from cover 12 to the housing, having been assembled by fitting in the lid according to the exemplary embodiment according to figure 3 in both variants I and II a bypass valve, so that the same center and fix both the support tube and also the filter element 7. The gasket 13 of the In turn, the support closes in the support tube 14 to the filter chamber with respect to the outlet opening. Through the water inlet 15 the refrigerant fluid flows into the oil cooler 3, which has been materialized as described above as a tubular countercurrent cooler. After the water has flowed through the oil cooler 3, it exits it through the water outlet 16. On the opposite side of the cooling plate of the oil cooler 3 the oil enters through the inlet of oil 17 to cooler 13 and leaves it after it has circulated through the tubular shaping cooler, through the oil outlet openings 6 towards the filter chamber 34. After the oil has passed through the filter element 7, which separates the unfiltered oil side from the filtered oil side, the filtered oil is supplied back through the oil outlet 19 to the lubricating oil circuit of the internal combustion engine. For the case that the filter element 7 has to be replaced for maintenance purposes and if residual oil is found inside the filter, it can flow through the oil drain 18 to the oil pan not shown in the internal combustion engine. The oil pipeline 20 is hermetically separated from the water pipeline 24 by means of a cooling fin 21 which presents on its side facing the internal combustion engine a flat sealing edge 22. To guarantee the oil supply to all the lubrication points of the internal combustion engine, the module according to figure 1 is equipped with a bypass valve 23, which in case the oil is too viscous to flow through the cooler 3, allows the oil to be derived and can flow directly to the filter chamber. The example of embodiment comprises another bypass valve 25, which in case of a filtering element clogged by dirt or in case the oil is too viscous to be able to flow through the filter element 7, allows the oil to be derived and can pass directly, ie in unfiltered form, into the support tube 14 and thus exit through the oil outlet 19. The module 1 is constituted by a support body 2, which constitutes in the example of embodiment illustrated in figure 4 simultaneously the housing of the oil cooler 3, as well as the housing of the filter 4. The inner cooling chamber 33 is separated by means of an elastomeric washer 5 from the oil sump so that said washer 5 act as a check valve. The washer 5 allows the oil to circulate from the oil sump to the cooler 13, however it prevents circulation in the opposite direction. The oil coming from the cooler 3 passes through the outlet openings 6 to the inner filter chamber. A filtering element 7 is mounted in the filter 4, which separates the impurities contained in the oil. The component group or the module 1 is fixed by means of fastening eyelets 9 and screws 10 with an internal combustion engine not illustrated, the module being sealed with sealing means towards the internal combustion engine so that the oil passing of the oil circuit of the internal combustion engine to "" module 1 can not leak, which is illustrated in figure 4 and 5. Since within certain maintenance intervals the filter element must be replaced from time to time, a cover 11 is located in the module 1, which closes by means of a cover gasket 12 to the housing, an bypass valve in the cover 11 having been fitted in the embodiment in accordance with FIG. 4, so that the same center and fix the support tube 14, as well as the filter element 7, flowing excess oil through the oil drain 18 to the oil sump. The gasket 13 of the support tube in turn seals in the support tube 14 to the filter chamber with respect to the oil outlet 19. Through the water inlet 15, which is illustrated in FIG. 5, the Coolant fluid passes to the oil cooler 3, which is materialized as a countercurrent cooler with plates, the water circuit is closed and the oil circuit is opened. In figure 4 it is illustrated that every second chamber of the oil cooler 3 is open towards the cooling chamber; in this case it is the oil pipes 20. Once the water has flowed through the oil cooler 3 through its water channeling 24 sealed with respect to the interior chamber of the cooler 33, the water leaves said cooler again through the water outlet 16 illustrated in figure 5. The oil passes through the oil inlet 17 to the oil cooler 3, which is fixed in the module 1 or in its support body 2 by means of screws 32, the oil leaving after having circulated through the oil cooler 3 formed in the form of a plate cooler through the oil outlet openings 6 towards the filter chamber. After passing through the filtering element 7 separating the unfiltered oil side from the filtered oil side, the filtered oil returns through the oil outlet 19 to the lubricating oil circuit of the internal combustion engine. The oil pipeline 20, which is open towards the cooler chamber 33, is separated by a cooling fin 21 in a sealed manner from the water pipeline .24. In order to guarantee the supply of oil to all the lubrication points of the internal combustion engine, the module illustrated in FIG. 4 is provided with a bypass valve 23, which allows in case the oil is too viscous to flow to Through the cooler 3, the oil can be diverted and flow directly into the inner filter chamber 34. The exemplary embodiment presents another bypass valve 25, which in case the filter element 7 is too clogged with dirt or that the If the oil is too viscous to flow through the filter element 7, it can be derived and flow directly, ie in the unfiltered state, through the interior of the support tube towards the oil outlet 19. The module 1 is constituted by a support body 2, the cial in the embodiment illustrated in figure 6 simultaneously constitutes the housing of the oil cooler 3 also the housing of The filter 4 is fixed to the supporting body 2 by means of screws 32. The inner cooling chamber 33 is separated by means of an elastomeric washer 5 with respect to the oil sump so that said washer 5 acts as retention valve. In this case the washer allows the oil to circulate from the oil sump to the cooler 3, however preventing the flow in the opposite direction. The oil coming from the cooler 3 passes through oil outlet openings 6 inside the filter chamber. A filter element 7 is mounted in the filter 4, which separates the impurities from the oil. In contrast to the embodiment of FIG. 4, the example illustrated in FIG. 6 shows an additional connection 8 for unfiltered oil, to which can be connected by means of a thread provided therein with another oil hose that is not illustrated in this. figure and which allows if necessary to supply oil to the filter 4 without it passing through the cooler 3. The component group or module 1 is fixed by means of fastening eyelets 9 and screws 10 to the internal combustion engine not shown, the module sealed by means of sealing means 22 with respect to said internal combustion engine so that the oil circulating from the oil circuit of the internal combustion engine towards the module 1 can not leak, which is apparent from figures 6 and 7. Since within certain maintenance intervals the filter element must be replaced from time to time, the module 1 is provided with a cover 11, which seals the sealed to the housing by means of a cover gasket 12, a cover valve being mounted in the cover 11 in the exemplary embodiment illustrated in FIG. 6 in such a way that it centers and fixes the support tube 14, as well as to the filter element 7; in case residual oil is found inside the filter, said residual oil may return through the oil drain 18 to the non-illustrated crankcase of the internal combustion engine. The gasket 13 of the support tube in turn seals in the support tube 14 to the filter chamber with respect to the outlet opening 19. Through the \ í ~. - water inlet 15 illustrated in figure 7, the cooling fluid enters the oil cooler 3, which is materialized in the form of a countercurrent plate cooler, the water circulation circuit being closed and the oil circulation circuit open . In Figure 6 it is illustrated that each second chamber of the oil cooler is open towards the interior of the cooling chamber; in this case, it is the case of the oil pipes 20. Once the water has flowed through the oil cooler ^ 3 through its water pipe 24 sealed with respect to the inner cooling chamber 33, the water leaves the latter. new through the water outlet 16 illustrated in figure 7. The oil enters through the oil inlet 17 to the cooler 3 and out of it, after it has circulated through the cooler formed in plate exchanger form, ^ through the oil outlet openings towards the inside of the filter chamber. Once the oil has passed through the filter element 7, which separates the unfiltered oil side from the filtered oil side, the filtered oil returns through the oil outlet 19 to the lubricating oil circuit of the engine. internal combustion. The oil channel 20, which is open towards the interior of the cooling chamber 33, is separated in a hermetic manner by means of a cooling fin 21 of the water pipe 24. To guarantee the oil supply to all the points For lubrication of the internal combustion engine, the module in Figure 6 is provided with a bypass valve 23, which drifts to the oil in case the oil is too viscous to flow "through the cooler 3, allowing that the oil flows directly into the filter chamber 34. This embodiment presents another bypass valve 25, which in case the filter element is clogged with impurities or the oil is too viscous to be able to flow through the filter element 7, allows the oil to be derived and flow directly through the interior of the support tube to the oil outlet 19. The module 1 is constituted by a body of so port 2, which in the case of the exemplary embodiment shown in FIG. 8 constitutes the housing of the oil cooler 3, as well as the housing of the filter 4. The inner filter chamber is separated from the cooler chamber by means of an elastomer washer 5 so that said washer 5 acts as a check valve. The washer 5 allows the oil to flow from the cooler 13 to the filter 4, while preventing the flow in the opposite direction. The oil coming from the cooler 3 passes through the oil outlet openings 6, which are sealed by the washer 5, displacing it through its lateral area to flow into the filter. A filter element 7 is mounted in the filter 4, which separates the impurities contained in the oil. The component group or the module 1 is fixed by means of fastening eyelets 9 and screws 10 to the internal combustion engine not illustrated. Since the filter element must be exchanged within certain maintenance intervals, a cover 11 is provided in the module 1, sealing it by means of a cover gasket 12 to the housing, having been fitted in the example embodiment illustrated in figure 8 a bypass valve 25 in the lid 11 so that the same center and guide the support tube as well as the filter element 7. The joint 13 of the support tube in turn seals in the support tube 14 inside the filter chamber with respect to the oil outlet. Through the water inlet 15 illustrated in FIG. 1, the cooling fluid passes to the oil cooler 3, which is materialized as a countercurrent cooler in plate exchanger form, as already illustrated in FIGS. 4 and 6. After the water has circulated through the oil cooler 3, it exits again "through the water outlet 16 illustrated in Figure 9. The oil enters through the oil inlet 17 to the cooler 3 and exits it once it has circulated through the shaped cooler. plate exchanger according to figures 4 and 6, through the oil outlet openings 6 towards the filter chamber 34. Once it has passed through the filter element 7, which separates the unfiltered oil side from the On the filtered oil side, the purified oil passes through the outlet opening 19 back to the lubrication oil circuit of the internal combustion engine, in case the filter element 7 has to be replaced for maintenance purposes and in the Inside the filter chamber there is residual oil, the latter can flow through the oil discharge 18 towards the non-illustrated crankcase of the internal combustion engine. of the water pipe 24 by means of a cooling fin 21 having on the side facing the internal combustion engine a sealing means 22, as illustrated in figures 4 and 6. To guarantee the supply of oil to the all the lubrication points of the internal combustion engine, the module according to figures 8 and 9 is equipped with a bypass valve 23, which in case the oil is too viscous to be able to flow through the cooler 3, allow the Oil is derived and can flow directly into the filter chamber. The embodiment according to FIG. 8 shows another bypass valve 25, which in case the filter element is clogged with dirt or in case the oil is too viscous to be able to flow through the filter element 7, allow the oil can be derived and flow directly, ie in unfiltered form, through the interior of the support tube towards the oil outlet 19. The module 1 illustrated in figure 9 comprises a support body 2 which constitutes the housing of the oil filter 3 as well as filter housing 4 not visible. The washer not shown allows the oil to flow from the cooler 3 through the outlet openings 6 to the non-visible filter, however, preventing the oil from circulating in the opposite direction. The component group or the module 1 is fixed by means of fastening eyelets 9 and screws 10 with the internal combustion engine not illustrated. Through the water inlet 15 the refrigerant goes to the oil cooler 3. Once the water has flowed through the oil cooler 3, it exits it again through the water outlet 16. The oil passes through the oil inlet 17 to the cooler 3 and out of it again after it has circulated in countercurrent through the cooler formed as a plate exchanger, through the outlet openings of the cooler. oil 6 towards the inner filter chamber. Once it has passed through the filter element 7 not shown, the filtered oil returns through the oil outlet 19 to the lubricating oil circulation circuit of the internal combustion engine. If it is necessary to replace the filter element for maintenance purposes and residual oil is found inside the filter chamber, it can flow through the oil drain 18 to the non-illustrated crankcase of the internal combustion engine. The sealing means 22 prevents leakage of oil, as well as water in the vicinity of the internal combustion engine. To guarantee the supply of oil to all lubrication points of the internal combustion engine, the module according to Figure 9 is provided with a bypass valve 3, which allows in case the oil is too viscous to be able to flow through the valve. cooler 3, that: it is derived and can flow directly to the filter chamber. The oil passes through the interior of the support tube towards the oil outlet 19 and is supplied from it to the lubrication points of the internal combustion engine.

Claims (1)

1. '-V Claims Component group for an apparatus driven by an internal combustion engine, characterized in that component elements are grouped to a module and means are provided with which the module can be connected to the internal combustion engine. "Component group according to claim 1, characterized in that a support body is integrated into the module, which can be connected to the internal combustion engine and on which the component elements of the module can be fixed. Several of the preceding claims, characterized in that the module has substantially as component parts an oil cooler and a filter Component group according to claim 3, characterized in that the oil cooler is constituted by a countercurrent exchanger. one or more of the preceding claims, characterized in that the module is expandable with other component elements 6. Component group according to at least one or more of the preceding claims, characterized in that the module comprises as an additional component at least one check valve and / or at least one bypass valve 7. A component group according to at least one or more of the preceding claims, characterized in that the housing of the oil cooler serves as the support body for the module, by means of which the module can be connected to the internal combustion engine. Component group according to at least one or more of the preceding claims, characterized in that at least one component part of the module is made of plastic. Component group according to at least one or more of the preceding claims, characterized in that the plastic material is thermally conductive. Component group according to at least one or more of the preceding claims, characterized in that the -retention valve comprises an elastomer washer in an approximately annular shape, which is disposed substantially between an oil cooler having "oil outlet openings". and a filter element of substantially annular shape, the washer being tensioned and fixed so that in the case of return all the oil outlet openings of the oil cooler are sealed. 11. Check valve according to claim 10, characterized in that the washer is cut off from a sleeve. 12. Check valve according to at least one or more of the preceding claims, characterized in that the washer is cut into a conical shape of a sleeve. 13. Check valve according to at least one or more of the preceding claims, characterized in that the washer is constituted by an elastomer resistant to high temperature oil. 14. Check valve according to at least one or more of the preceding claims, characterized in that the washer is made of silicone rubber resistant to high temperature oil.