Hydraulic Breather Caps

Hydraulic breather caps are parts used to protect equipment against moisture and particle contamination. Moisture vapour is stripped from the air and expelled back into the atmosphere by pump cycles which means moisture is exerted with each flow cycle by the opening and closing of the breather caps. These caps also prevent dirt particles from entering the equipment at very high efficiency rates.

What are hydraulic breather caps used for?

Air trapped within hydraulic systems expands significantly above 72°C. This can cause vibration and unsteady function of machinery. Hydraulic breather caps release the trapped air to bring the system back into balance. Breather caps are often used in oil-cooled electrical transformers. They can also make up venting parts for gearboxes.

Mobile equipment (such as petrol tankers) has breather caps fitted to prevent explosions due to the motion of combustible materials in transit.

Types of hydraulic breather caps

Some hydraulic breather caps have added valves (double or vacuum) and others come with dipstick options. These caps can also have attached sealing discs that prevent hydraulic fluid leakage and keep dust particles out. Breather caps come in threaded, screw-on or bayonet configurations.


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Omschrijving Prijs Filtration Size Connection Thread Cap Diameter Colour Cap Material Finish Maximum Operating Temperature Thread Size Thread Standard
RS-stocknr. 364-1317
Fabrikantnummer53921
FabrikantElesa-Clayton
2,67 €
Each
Aantal stuks
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS-stocknr. 729-026
FabrikantnummerH00279001
FabrikantParker
13,18 €
Each
Aantal stuks
70µm G 1/4 35mm - - - +90°C 1/4 -
RS-stocknr. 333-1111
FabrikantnummerSAB.1563.40
FabrikantParker
13,94 €
Each
Aantal stuks
40µm G 1/4 - Orange - - - 1/4 -
RS-stocknr. 283-3240
Fabrikantnummer54681
FabrikantElesa-Clayton
6,43 €
Each
Aantal stuks
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS-stocknr. 364-1373
Fabrikantnummer54611
FabrikantElesa-Clayton
3,87 €
Each
Aantal stuks
- M16 x 1.5 31mm Orange Polyamide Semi Matte +120°C - Metric
RS-stocknr. 283-3161
Fabrikantnummer54101
FabrikantElesa-Clayton
3,34 €
Each
Aantal stuks
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS-stocknr. 914-9488
Fabrikantnummer56261
FabrikantElesa-Clayton
5,69 €
Each
Aantal stuks
- G 1 57mm Orange Polyamide Semi Matte +100°C 1in G
RS-stocknr. 364-1294
Fabrikantnummer53911
FabrikantElesa-Clayton
2,33 €
Each
Aantal stuks
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS-stocknr. 283-3256
Fabrikantnummer54691
FabrikantElesa-Clayton
4,61 €
Each
Aantal stuks
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS-stocknr. 329-1530
FabrikantnummerAB98610101
FabrikantParker
13,17 €
Each
Aantal stuks
10µm G 1/2 101mm - Glass Filled Nylon - +90°C 1/2 -
RS-stocknr. 364-1288
Fabrikantnummer53901
FabrikantElesa-Clayton
2,33 €
Each
Aantal stuks
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS-stocknr. 283-3228
Fabrikantnummer54661
FabrikantElesa-Clayton
4,12 €
Each
Aantal stuks
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS-stocknr. 283-3199
Fabrikantnummer54201
FabrikantElesa-Clayton
3,57 €
Each
Aantal stuks
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS-stocknr. 153-3759
Fabrikantnummer54222-EX
FabrikantElesa
123,60 €
1 Bag of 10
Bag(s)
40µ G 3/4 42mm Black, Orange Technopolymer Semi Matte +80°C 0.75in G
RS-stocknr. 153-3752
Fabrikantnummer54011-EX
FabrikantElesa
123,60 €
1 Bag of 10
Bag(s)
40µ G 3/8 31mm Black, Orange Technopolymer Semi Matte +80°C 0.375in G
RS-stocknr. 914-9476
Fabrikantnummer56181
FabrikantElesa-Clayton
3,54 €
Each
Aantal stuks
- G 3/8 42mm Orange Polyamide Semi Matte +100°C 3/8in G
RS-stocknr. 729-032
FabrikantnummerH00279003
FabrikantParker
17,82 €
Each
Aantal stuks
70µm G 1/2 35mm - - - +90°C 1/2 -
RS-stocknr. 283-3155
Fabrikantnummer54001
FabrikantElesa-Clayton
2,91 €
Each
Aantal stuks
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS-stocknr. 329-1546
FabrikantParker
13,37 €
Each
Aantal stuks
10µm G 3/4 101mm - Glass Filled Nylon - +90°C 3/4 -
RS-stocknr. 914-9460
Fabrikantnummer53932
FabrikantElesa-Clayton
5,69 €
Each
Aantal stuks
- G 1-1/4 57mm Orange Polyamide Semi Matte +100°C 1-1/4in G
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