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 Price Filtration Size Connection Thread Cap Diameter Colour Cap Material Finish Maximum Operating Temperature Thread Size Thread Standard
RS庫存編號 729-026
製造零件編號H00279001
BrandParker
TWD1,031.00
單位
70µm G 1/4 35mm - - - +90°C 1/4 -
RS庫存編號 364-1373
製造零件編號54611
TWD177.00
單位
- M16 x 1.5 31mm Orange Polyamide Semi Matte +120°C - Metric
RS庫存編號 914-9488
製造零件編號56261
TWD190.00
單位
- G 1 57mm Orange Polyamide Semi Matte +100°C 1in G
RS庫存編號 914-9476
製造零件編號56181
TWD118.00
單位
- G 3/8 42mm Orange Polyamide Semi Matte +100°C 3/8in G
RS庫存編號 283-3199
製造零件編號54201
TWD163.00
單位
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS庫存編號 729-032
製造零件編號H00279003
BrandParker
TWD893.00
單位
70µm G 1/2 35mm - - - +90°C 1/2 -
RS庫存編號 283-3240
製造零件編號54681
TWD282.00
單位
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS庫存編號 283-3206
製造零件編號54301
TWD183.00
單位
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS庫存編號 237-8743
製造零件編號AB685101
BrandParker
TWD701.00
單位
10µm G 3/8 70mm Black Glass Filled Nylon - - 3/8 -
RS庫存編號 914-9472
製造零件編號56151
TWD105.00
單位
- G 1/4 31mm Orange Polyamide Semi Matte +100°C 1/4in G
RS庫存編號 283-3234
製造零件編號54671
TWD192.00
單位
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS庫存編號 914-9479
製造零件編號53933
TWD202.00
單位
- G 1 1/2 57mm Orange Polyamide Semi Matte +100°C 1-1/2in G
RS庫存編號 283-3155
製造零件編號54001
TWD133.00
單位
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS庫存編號 333-1111
製造零件編號SAB.1563.40
BrandParker
TWD656.00
單位
40µm G 1/4 - Orange - - - 1/4 -
RS庫存編號 283-3256
製造零件編號54691
TWD289.00
單位
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS庫存編號 329-1530
製造零件編號AB98610101
BrandParker
TWD701.00
單位
10µm G 1/2 101mm - Glass Filled Nylon - +90°C 1/2 -
RS庫存編號 283-3161
製造零件編號54101
TWD161.00
單位
- G 1/2 31mm Orange Polyamide Semi Matte +120°C 1/2in G
RS庫存編號 283-3212
製造零件編號54651
TWD197.00
單位
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G
RS庫存編號 283-3228
製造零件編號54661
TWD177.00
單位
- G 3/8 31mm Orange Polyamide Semi Matte +120°C 3/8in G
RS庫存編號 329-1546
BrandParker
TWD701.00
單位
10µm G 3/4 101mm - Glass Filled Nylon - +90°C 3/4 -