Technician A says that a relay piston in a foot valve responds to pneumatic signal from the primary section of the valve,by metering out into the secondary circuit the same pressure that acts on it.Technician B says that the further a primary piston travels through its stroke in a dual circuit foot valve,the more pressure is applied in opposition to foot pressure.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Sowmya Mudunuri · Accepted Answer

Final Answer : C, Explanation :  Both technicians are correct. Technician A describes the function of a relay piston in a foot valve accurately, as it does respond to pneumatic signals from the primary section and meters out the same pressure into the secondary circuit. Technician B correctly explains the operation of a dual circuit foot valve, where the travel of the primary piston through its stroke increases the pressure in opposition to foot pressure, which is a fundamental aspect of how dual circuit foot valves modulate braking force.

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