Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere

Full Title

Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00 (valve structures responsive to a speed condition B60T8/34; valves in general F16K) > Application and release valves > Triple or other relay valves which allow step-wise application or release and which are actuated by brake-pipe pressure variation to connect brake cylinders or equivalent to compressed air or vacuum source or atmosphere

Child Classifications

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• B60T 15/181
• B60T 15/182
• B60T 15/184
• B60T 15/20 controlled by two fluid pressures
• B60T 15/24 controlled by three fluid pressures
• B60T 15/34 controlled alternatively by two or three fluid pressures