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Why do bubbles come out from the element in the oil passage of an AL series lubricator?

For AL30-A to AL60-A series lubricators, when the lubrication plug is opened under the pressure of the lubricator, air bubbles may be generated at the end of the oil passage (sometimes they are not). This is also caused by the bowl’s internal pressure being lower than the outlet pressure.

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://smccatalog.partbuilder.smcpneumatics.com/support/faq/en-jp/?ca_id=combination-units&fa_id=11000

VV7110-03LT-02BT

Stations: 10 Stations, AB Port: 03L (3/8, Left), AB Thread: T (NPTF), Control: None, PR Port: 02B (1/4, Both Sides), PR Thread: T (NPTF)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV7110-03LT-02BT

VV7110-03R-02B

Stations: 10 Stations, AB Port: 03R (3/8, Right), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV7110-03R-02B

VV712-02L-E02B3

Stations: 2 Stations, AB Port: 02L (1/4, Left), AB Thread: Rc, Control: E (Air Release Valve), PR Port: 02B (1/4, Both Sides), PR Thread: Rc, Silencer: None, Voltage: 3 (24VDC)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV712-02L-E02B3

VV712-02R-02B3

Stations: 2 Stations, AB Port: 02R (1/4, Right), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides), PR Thread: Rc, Silencer: None, Voltage: 3 (24VDC)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV712-02R-02B3

VV712-03R-02B

Stations: 2 Stations, AB Port: 03R (3/8, Right), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV712-03R-02B

VV713-02L-02B

Stations: 3 Stations, AB Port: 02L (1/4, Left), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV713-02L-02B

VV713-02R-02B

Stations: 3 Stations, AB Port: 02R (1/4, Right), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV713-02R-02B

VV714-02R-MP02B3

Stations: 4 Stations, AB Port: 02R (1/4, Right), AB Thread: Rc, Control: MP (AirFilter w/Man.Drain, Reg., AirReleaseValve, Press.Sw.), PR Port: 02B (1/4, Both Sides), PR Thread: Rc, Silencer: None, Voltage: 3 (24VDC)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV714-02R-MP02B3

VV714-03L-02B

Stations: 4 Stations, AB Port: 03L (3/8, Left), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV714-03L-02B

VV714-03R-02B

Stations: 4 Stations, AB Port: 03R (3/8, Right), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV714-03R-02B

VV715-02R-AP02BSB3

Stations: 5 Stations, AB Port: 02R (1/4, Right), AB Thread: Rc, Control: AP (AirFilter w/AutoDrain, Reg., AirReleaseValve, Press.Sw.), PR Port: 02B (1/4, Both Sides), PR Thread: Rc, Silencer: SB (Silencer Box), Voltage: 3 (24VDC)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV715-02R-AP02BSB3

VV716-02L-MP02B3

Stations: 6 Stations, AB Port: 02L (1/4, Left), AB Thread: Rc, Control: MP (AirFilter w/Man.Drain, Reg., AirReleaseValve, Press.Sw.), PR Port: 02B (1/4, Both Sides), PR Thread: Rc, Silencer: None, Voltage: 3 (24VDC)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV716-02L-MP02B3

VV714-02Y-MP02BSB3

Stations: 4 Stations, AB Port: 02Y (1/4, Bottom), AB Thread: Rc, Control: MP (AirFilter w/Man.Drain, Reg., AirReleaseValve, Press.Sw.), PR Port: 02B (1/4, Both Sides), PR Thread: Rc, Silencer: SB (Silencer Box), Voltage: 3 (24VDC)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV714-02Y-MP02BSB3

VV712-03RT-02BTSB

Stations: 2 Stations, AB Port: 03R (3/8, Right), AB Thread: T (NPTF), Control: None, PR Port: 02B (1/4, Both Sides), PR Thread: T (NPTF), Silencer: SB (Silencer Box)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV712-03RT-02BTSB

VV712-03L-02B

Stations: 2 Stations, AB Port: 03L (3/8, Left), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV712-03L-02B

VV716-03R-02B

Stations: 6 Stations, AB Port: 03R (3/8, Right), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV716-03R-02B

VV712-02RT-E02BT3

Stations: 2 Stations, AB Port: 02R (1/4, Right), AB Thread: T (NPTF), Control: E (Air Release Valve), PR Port: 02B (1/4, Both Sides), PR Thread: T (NPTF), Silencer: None, Voltage: 3 (24VDC)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV712-02RT-E02BT3

VV716-03L-02B

Stations: 6 Stations, AB Port: 03L (3/8, Left), AB Thread: Rc, Control: None, PR Port: 02B (1/4, Both Sides)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV716-03L-02B

VV713-02YT-02BT

Stations: 3 Stations, AB Port: 02Y (1/4, Bottom), AB Thread: T (NPTF), Control: None, PR Port: 02B (1/4, Both Sides), PR Thread: T (NPTF)

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://partbuilder.smcpneumatics.com/product-search-results/VV713-02YT-02BT