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 364-1373
製造零件編號54611
HK$34.51
單位
- M16 x 1.5 31mm Orange Polyamide Semi Matte +120°C - Metric
RS庫存編號 283-3183
製造零件編號56671
HK$34.19
單位
- G 1/2 42mm Orange Polyamide Semi Matte +120°C 1/2in G
RS庫存編號 283-3149
製造零件編號53935
HK$27.05
單位
- G 1/4 31mm Orange Polyamide Semi Matte +120°C 1/4in G
RS庫存編號 364-1323
製造零件編號53931
HK$31.16
單位
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS庫存編號 283-3256
製造零件編號54691
HK$66.00
單位
- G 1 42mm Orange Polyamide Semi Matte +120°C 1in G
RS庫存編號 914-9460
製造零件編號53932
HK$46.35
單位
- G 1-1/4 57mm Orange Polyamide Semi Matte +100°C 1-1/4in G
RS庫存編號 914-9488
製造零件編號56261
HK$44.96
單位
- G 1 57mm Orange Polyamide Semi Matte +100°C 1in G
RS庫存編號 914-9472
製造零件編號56151
HK$20.87
單位
- G 1/4 31mm Orange Polyamide Semi Matte +100°C 1/4in G
RS庫存編號 914-9479
製造零件編號53933
HK$49.37
單位
- G 1 1/2 57mm Orange Polyamide Semi Matte +100°C 1-1/2in G
RS庫存編號 364-1288
製造零件編號53901
HK$26.44
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
HK$127.34
單位
40µm G 1/4 - Orange - - - 1/4 -
RS庫存編號 283-3199
製造零件編號54201
HK$37.20
單位
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS庫存編號 237-8743
製造零件編號AB685101
BrandParker
HK$132.04
單位
10µm G 3/8 70mm Black Glass Filled Nylon - - 3/8 -
RS庫存編號 729-026
製造零件編號H00279001
BrandParker
HK$230.00
單位
70µm G 1/4 35mm - - - +90°C 1/4 -
RS庫存編號 283-3240
製造零件編號54681
HK$60.26
單位
- G 3/4 42mm Orange Polyamide Semi Matte +120°C 3/4in G
RS庫存編號 237-8765
製造零件編號AB.687101.UC
BrandParker UCC
HK$197.85
單位
10µm G 3/4 - Black Glass Coupled PP, Glass Filled Nylon - - 3/4 -
RS庫存編號 914-9485
製造零件編號56241
HK$46.35
單位
- G 3/4 57mm Orange Polyamide Semi Matte +100°C 3/4in G
RS庫存編號 914-9476
製造零件編號56181
HK$28.85
單位
- G 3/8 42mm Orange Polyamide Semi Matte +100°C 3/8in G
RS庫存編號 729-032
製造零件編號H00279003
BrandParker
HK$176.40
單位
70µm G 1/2 35mm - - - +90°C 1/2 -
RS庫存編號 153-3759
製造零件編號54222-EX
BrandElesa
HK$1,207.00
毎包:10 個
Bag(s)
40µ G 3/4 42mm Black, Orange Technopolymer Semi Matte +80°C 0.75in G