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munirabbasi

Brake Selector Relief valve

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Im confused your question

Are you asking about anti-skid valves or brake selector valves?

What makes you think there is a specific pressure for selector valves?

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1 hour ago, hehe said:

Im confused your question

Are you asking about anti-skid valves or brake selector valves?

What makes you think there is a specific pressure for selector valves?

Brake selector valve relief to return line. The selector valve has builtin relief valve?

Munir Abbasi

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The dual brake control valve have a metering valve piston is hollow with series of radial at return port end.An over pressure condition in the brake assembly ,caused by thermal expansion ,is automatically relieved by metering valve piston. Regard

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On 12/18/2018 at 9:37 AM, munirabbasi said:

Brake selector valve relief to return line. The selector valve has builtin relief valve?

Munir Abbasi

Ahmer is correct.  The "relief" for brakes comes from the power brake control valves.

The selector valves do leak internally quite a bit once you get into the 4K+ range but thats not really the purpose of them. 

Really depends on what year/model/brake system your aircraft has because there are quite a few differences between the systems (IE: anti-skid valves, 3k or 2030 psi metering valves, parking brake valves, single/multi disk/carbon brakes, etc)

There are also 4 different selector valve part numbers depending on which aircraft it is.  

Simple answer, no the selector valves dont have a relief valve

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17 hours ago, hehe said:

Ahmer is correct.  The "relief" for brakes comes from the power brake control valves.

The selector valves do leak internally quite a bit once you get into the 4K+ range but thats not really the purpose of them. 

Really depends on what year/model/brake system your aircraft has because there are quite a few differences between the systems (IE: anti-skid valves, 3k or 2030 psi metering valves, parking brake valves, single/multi disk/carbon brakes, etc)

There are also 4 different selector valve part numbers depending on which aircraft it is.  

Simple answer, no the selector valves dont have a relief valve

See Image

Munir Abbasi

Picture1.thumb.jpg.275ecc79c1cc1fdacff8e435011c4434.jpg

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6 hours ago, munirabbasi said:

Picture1.thumb.jpg.275ecc79c1cc1fdacff8e435011c4434.jpg

That is a manual override button, similar to override on flap selector valve/landing gear selector valve/ etc...only used that maybe twice that I can remember.  Good for troubleshooting a valve that wont close when energized electrically but serves no purpose in the system operation

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5 hours ago, hehe said:

That is a manual override button, similar to override on flap selector valve/landing gear selector valve/ etc...only used that maybe twice that I can remember.  Good for troubleshooting a valve that wont close when energized electrically but serves no purpose in the system operation

Thanks

Munir Abbasi

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