... FKA,FKB,FKC,FKD,FKE,crossover relief valve and model FKS cushion crossover anticavitation relief valves.Being a combinatory valve, it can ... .Contains dual shockproof valves to protect the steering units,hoses and steering cylinder from excessive system pressure,due to sudden ... steering wheel.It also contains suction valves to help prevent cavitation at the low pressure side of the cylinder and inlet ...