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Locomotives Brake (JZ-6/JZ-7)

Locomotives Brake (JZ-6/JZ-7)
Price: Negotiable
Min Order: 1
Brake JZ-7 may be used not only on passenger locomotives but also on freight locomotives. It has the ability to gradually release at passenger locomotive, and directly release at freight locomotive. Brake JZ-7 is able to perform self lapping, namely it may keep automatically pressure constant after brake pipe releasing. Brake cylinder may be automatically charged by air once the brake cylinder leaks out, so it has a good endurance. While emergency braking applied, the brake cylinder may pressurize. In order to suit for long and large train braking, a over-charge position is designed to shorten train pipe, as well as the initial charging and recharging time of auxiliary reservoir. This type of brake may used on various diesel locomotives and electric locomotives.

JZ-7 brake valve for locomotive consists of automatic brake valve, independent brake valve, relay valve, distributing valve, application valve, equalizing reservoir, service reservoir, pressure reduction reservoir, application reservoir, and brake reservoir and so on. The structure of rubber diaphragm and spool valve with O-ring has been adopted in the JZ-7 brake valve, so as to prolong the overhaul cycle. It makes manufacture, usage and repair work more conveniently. Applied a cam to control the actuating mechanism, the automatic brake valve and the independent brake valve make control handle easy to operate and not be effected by temperature. The distributing valve uses two-pressure and three-pressure mixing structure; It has not only graduated release function but also direct release function. So the distributing valve suits for different brake cylinder capacity of modern locomotives and brake reservoir pressure will not vary along with the variety of brake cylinder volume. No matter where the locomotive is in the train, the same of brake reservoir pressure will be received.
Characteristics and Parameters
of JZ-7 
 
Performance of   automatic braking:
Time for initial charge of pressure   reservoir of   distributing valve from 0 to 460 kPa : 50~60s Time for initial charge of pressure   reduction   reservoir of distributing valve from 0 to 480 kPa : 55~65s Effective local reduction of brake pipe (KPa): 25~35 4.   Local reduction should take effect before brake pipe of the single locomotive reduces pressure to 20 kPa. At the same time, the main valve acts:            starting local reduction and brake cylinder lifting pressure   
5. Graduated release times after in full service application:   not less than 5 times (at the passenger train position)
6. Time for pressure reduction in equalizing reservoir in service application from 500KPa to 360KPa (S): 5~7
7. Max. brake cylinder pressure in full service application (KPa): 340-360
8. Time for build-up of brake cylinder pressure in full service application (S): 5-7
9. Time for release of brake cylinder pressure from 350KPa to 35KPa (S): 5~8
10. Time for exhaust of brake pipe to 0 in emergency application (S): within 3s
11. Max brake cylinder pressure after emergency application (KPa): 420~450
12. Time for build-up of brake cylinder pressure to max. after emergency application (S): 5~7
Performance of independent braking:
Highest brake cylinder pressure in full application position (KPa): 300 Time for build-up of brake cylinder pressure from 0 to 280KPa (S): within 3s In running position, time   for   reduction of   brake   cylinder   pressure from 300Kpa   to 35Kpa (S):   within 4s


 
 
 Valves included
 

Main Technical Parameters
 

Applications
 
Air-vacuum Brake JZ-6
 
Automatic brake valve
 

A :Automatic Braking :
1 ,Pressure inside braking cylinder:350KPa,time 7-10 seconds.
2 ,Time for reduction of cylinder pressure from the highest to 35KPa: 6-8 s
3 ,Highest pressure of emergency braking cylinder: 450KPa: 4-7s

B: Independent braking :
1,Highest cylinder pressure:300KPa
 
Mainly for locomotives in the Tanzania and Zambia   railways(Distribute on valve is used for JZ-7Cbraking system)
 
Distribute valve
 
Relay valve
 
Air application valve
 
Vacuum proportional valve
 
Vacuum relay valve
 
Vacuum control valve
 
Double heading valve
 
Release restriction valve
 
Prod Model: JZ-6/JZ-7
Tianjin JL Railway Transport Equipment Ltd. is a subsidiary of China Northern Locomotive and Rolling Stock Industry (Group) company(CNR), founded in 1906. It is a main factory producing locomotive and rolling stock accessories in China. Recent years it has witnessed several times large scale innovation and become capital production base of accessories of railway. It can provide with various technological means of machining, precision casting, precision forging and heat treatment.

It covers an area of 500, 000 square meters, of which the floor space is 150, 000 square meters. It has 1946 sets of various kinds of machines, among which there are 119 sets of CNC machining and detecting equipment with advanced international standards. Now the works has 3, 200 employees, among whom there are more than 300 technical and managerial personnel.

The works can make a variety of products constructional complicated and technically intensive. Many of the products are directly related with the train's safe running so the requirements for the quality and accuracy of the products are high. The main products of our works are: Turbochargers, governors, piston rings, filters, hydraulic dampers and electrical motors used on diesel locomotives, various types of draft gears and springs used on locomotives, passenger and freight cars, brakes used in locomotives and passenger cars.

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  • Tianjin JL Railway Transport Equipment Ltd.

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