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内燃机车JZ-7型空气制动机主阀部设置两个限压阀,一个是常用限压阀,另一个是紧急限压阀。常用限压阀的作用是当列车施行常用制动时限制进入作用风缸的风压不超过340kpa—360kpa;紧急限压阀的作用是当列车施行紧急制动时限制进入作用风缸的风压不超过420kpa—450kpa。
Diesel locomotive JZ-7-type air brake main valve set two pressure limiting valve, one is commonly used pressure limiting valve, the other is an emergency pressure limiting valve. Commonly used pressure limiting valve is the role of the train when the common brake is limited to enter the role of the wind pressure does not exceed the cylinder pressure of 340kpa-360kpa; emergency pressure limiting valve is used when the train emergency braking limit into the role of the wind pressure Not exceed 420kpa-450kpa.