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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Description Prix Filtration Size Connection Thread Cap Diameter Colour Cap Material Finish Maximum Operating Temperature Thread Size Thread Standard
N° de stock RS 333-1111
Référence fabricantSAB.1563.40
MarqueParker
14,92 €
Each
Unité
40µm G 1/4 - Orange - - - 1/4 -
N° de stock RS 283-3240
Référence fabricant54681
6,62 €
Each
Unité
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
N° de stock RS 729-026
Référence fabricantH00279001
MarqueParker
13,44 €
Each
Unité
70µm G 1/4 35mm - - - +90°C 1/4 -
N° de stock RS 364-1317
Référence fabricant53921
2,83 €
Each
Unité
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
N° de stock RS 283-3155
Référence fabricant54001
3,00 €
Each
Unité
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
N° de stock RS 914-9485
Référence fabricant56241
5,86 €
Each
Unité
- G 3/4 57mm Orange Polyamide Semi Matte +100°C 3/4in G
N° de stock RS 364-1323
Référence fabricant53931
3,22 €
Each
Unité
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
N° de stock RS 364-1373
Référence fabricant54611
3,99 €
Each
Unité
- M16 x 1.5 31mm Orange Polyamide Semi Matte +120°C - Metric
N° de stock RS 283-3161
Référence fabricant54101
3,44 €
Each
Unité
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
N° de stock RS 914-9488
Référence fabricant56261
5,86 €
Each
Unité
- G 1 57mm Orange Polyamide Semi Matte +100°C 1in G
N° de stock RS 914-9472
Référence fabricant56151
2,67 €
Each
Unité
- G 1/4 31mm Orange Polyamide Semi Matte +100°C 1/4in G
N° de stock RS 283-3234
Référence fabricant54671
4,37 €
Each
Unité
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
N° de stock RS 283-3199
Référence fabricant54201
3,68 €
Each
Unité
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
N° de stock RS 329-1530
Référence fabricantAB98610101
MarqueParker
13,43 €
Each
Unité
10µm G 1/2 101mm - Glass Filled Nylon - +90°C 1/2 -
N° de stock RS 283-3228
Référence fabricant54661
4,24 €
Each
Unité
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
N° de stock RS 283-3183
Référence fabricant56671
3,68 €
Each
Unité
- G 1/2 42mm Orange Polyamide Semi Matte +120°C 1/2in G
N° de stock RS 283-3206
Référence fabricant54301
4,10 €
Each
Unité
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
N° de stock RS 364-1288
Référence fabricant53901
2,40 €
Each
Unité
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
N° de stock RS 153-3759
Référence fabricant54222-EX
MarqueElesa
12,79 €
1 Bag of 10
Sachet(s)
40µ G 3/4 42mm Black, Orange Technopolymer Semi Matte +80°C 0.75in G
N° de stock RS 914-9460
Référence fabricant53932
5,86 €
Each
Unité
- G 1-1/4 57mm Orange Polyamide Semi Matte +100°C 1-1/4in G