munirabbasi Posted December 17, 2018 Share Posted December 17, 2018 Hello Hydraulic expertise At what pressure Brake selector valves (Normal & emergency) relief the pressure into return line Munir Abbasi Quote Link to comment Share on other sites More sharing options...
hehe Posted December 18, 2018 Share Posted December 18, 2018 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? Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 18, 2018 Author Share Posted December 18, 2018 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 Quote Link to comment Share on other sites More sharing options...
Ahmer Posted December 19, 2018 Share Posted December 19, 2018 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 Quote Link to comment Share on other sites More sharing options...
hehe Posted December 19, 2018 Share Posted December 19, 2018 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 Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 20, 2018 Author Share Posted December 20, 2018 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 Quote Link to comment Share on other sites More sharing options...
hehe Posted December 20, 2018 Share Posted December 20, 2018 6 hours ago, munirabbasi 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 Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 21, 2018 Author Share Posted December 21, 2018 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 Quote Link to comment Share on other sites More sharing options...
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