System Introduction
Type MAC brake system is in accordance with requirements of AAR Standard for brake system .Air Brake System MAC has good effects within the range scope from -40℃ to +66℃,Performances of this brake system on fixation text platform of 150 trains:common propagation rate of 180m/s ,emergency braking propagation rate of 280m/s,release propagation rate of more than 150m/s .
System Configuration
The general configuration of Air Brake System MAC:control valve MAC,KZF-1 empty/loaded changeover valve,Equalizing reservoir,254X305-A brake cylinder,Combined auxiliary and emergency reservoir,ZT3-500 slack adjuster,combined dirt collector and branch pipe cut-out cock,angle cock ,air hose and Retainer valve etc.
Control Valve MAC
FunctionsControl Valve MAC is the key part of air brake system, to control brake system to generate inflation, braking, ease and other functions
Technical parameters- Working temperature:-40~66℃
- level pressure:70psi
- The pressure of brake cylinder:reduced pressure 25psi,brake cylinder of 48~52psi
- Release time:brake cylinder pressure release from 50psi to 5psi for 21~25s
- Emergency brake :the pressure of brake cylinder is 12~18psi within 1.5s ;to reach 90% of the max pressure within 8~10s,which must be 15~20% more than the common full braking .
aluminum-alloy
- Name
Control Valve MAC
FunctionsControl Valve MAC is the key part of air brake system, to control brake system to generate inflation, braking, ease and other functions
Technical parameters- Working temperature:-40~66℃
- level pressure:70psi
- The pressure of brake cylinder:reduced pressure 25psi,brake cylinder of 48~52psi
- Release time:brake cylinder pressure release from 50psi to 5psi for 21~25s
- Emergency brake :the pressure of brake cylinder is 12~18psi within 1.5s ;to reach 90% of the max pressure within 8~10s,which must be 15~20% more than the common full braking .
aluminum-alloy
Control Valve MAC
- Name
Type 150A Air Control Valve
FunctionsThe functions of type 150 air control valve are consistent with 120,but plunger valve replace the slide valve ,structure is more reliable, maintenance is more convenient.
Technical parameters- Working temperature:-50~70℃
- level pressure:70psi
- The pressure of brake cylinder:reduced pressure 25psi,brake cylinder of 48~52psi
- Release time:brake cylinder pressure release from 50psi to 5psi for 21~25s
- Emergency brake :the pressure of brake cylinder is 12~18psi within 1.5s ;to reach 90% of the max pressure within 8~10s,which must be 15~20% more than the common full braking .
aluminum-alloy
Type 150A Air Control Valve
- Name
KZF-1 empty/loaded changeover valve
FunctionsAccording to the load state of the vehicle to provide two kinds of pressure of controlling signals to the MAC distributing value. one is "empty",the other is "loaded ".
Technical parameters- Working temperature:-40~66℃
- level pressure:70psi
- The pressure of brake cylinder:reduced pressure 25psi,brake cylinder of 48~52psi
- Release time:brake cylinder pressure release from 50psi to 5psi for 21~25s
- Emergency brake :the pressure of brake cylinder is 12~18psi within 1.5s ;to reach 90% of the max pressure within 8~10s,which must be 15~20% more than the common full braking
- The pressure of brake cylinder : 50%2psi of the load.
aluminum-alloy
KZF-1 empty/loaded changeover valve
- Name
ZT3-500 Slack Adjuste
FunctionsType ZT3-500 Slack Adjuster can automatically shorten and stretch due to worn-out or replacement of the brake shoe,to ensure the distance of the brake shoe and the wheel tread surface remain unchanged during the train operating
Technical parameters- Working temperature:-40~66℃
High-quality carbon steel
ZT3-500 Slack Adjuste
- Name
Brake cylinder
FunctionsBrake cylinder can produce the push power according to the change of brake cylinder pressure and the piston size ,and pass this power to the rigging by piston push rod .
Technical parameters- Working temperature:-40~66℃
- The diameter diameter:254mm
- Piston maximum stroke:305mm
High-quality carbon steel
Brake cylinder
- Name
Combined auxiliary and emergency reservoir
Functionsauxiliary reservoir and emergency reservoir together .The capacity of the auxiliary reservoir is 2500, and the emergency reservoir 3500 .
Technical parameters- Working temperature:-40~66℃
- The maximum allowable working pressure of combined auxiliary and emergency reservoir is 150psi.
High-quality carbon steel
Combined auxiliary and emergency reservoir
- Name
Angle Cock
FunctionsThe angle cock is used to close the air brake device in the vehicle and empty the the compressed air in hose connector
Technical parameters- Working temperature:-40~66℃
Cast iron
Angle Cock
- Name
Air hose
FunctionsAir hose is used to connect the train pipe.
Technical parameters- Working temperature:-40~66℃
Cast iron and rubber
Air hose
- Name
combined dirt collector and branch pipe cut-out cock
Functionscombined dirt collector and branch pipe cut-out cock is used to open or close the passage between the brake pipe and control valve .
Technical parameters- Working temperature:-40~66℃
Cast iron
combined dirt collector and branch pipe cut-out cock
- Name
Retainer valve
FunctionsHolding the valve hand to rotate through the pressure, the retainer valve has three different function positions to control the pressure exhaust velocity of the brake cylinder during releasing .
Technical parameters- Working temperature:-40~66℃
- EX(direct exhaust position):no more than 3S from 70psi to 10psi.
- HP(High pressure holding position):about 33~43s from 60 psi to 40 psi
- SD(slow exhaust position):about 17~22s from 60psi to 40 psi.
Cast iron
Retainer valve