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Products & Services


Automatic Twist Locks

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  • Secures containers to railcars in railroad applications
  • Fits all containers with ISO corner castings.
  • Easy weld application.
  • Universal-no rights or lefts.
  • Faster loading and unloading times by eliminating need for a ground man to lock/unlock manual locks.
  • Costs less to install and maintain.
  • U.S. Patent 4,626,155 of M/s Holland Co. USA
  • Rugged design ideal for specialty services such as garbage/waste haul and dirt/sand/coal haul.

Product Code: 68830

Rail Pads

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The Primary function of the rail pad traditionally has been that of a conforming resilient member between the as-rolled surface of the rail, and the as-cast surface of the rail seat of the concrete sleeper. It also provides an electric insulation between these two surfaces.

However in today's environment where the axle loads and speeds are being increased to 32.5 tons and 180 km/hr. respectively on Indian Railways, other requirements have gained importance and dynamic performance of the rail pads have become the main criteria of design, development and selection / adoption.

The rail pads are developed in collaboration with M/s. Vulcanite of Australia to have High resilience, impact attenuating, wear and tear resistant properties. M/s. Vulcanite Australia is a specialized rubber product development company, who are world leaders in design and development of rubber isolators / energy absorbers for railways and construction industry. The rail pads has been extensively tested and adopted by Australian Rail Track Corporation for high axle load, heavy haul freight train tracks.

1. The key design feature of our rail pad is - Multi Spring configuration. This configuration provides three groups of secant compression springs rates as follows:

1st is a low rate to provide adequate deformation induced by low load (Wagon at tare).

2nd is a higher rate designed for the normal maximum axle loads of 35 tons, again to provide deformation to minimize shock loads.

3rd rate which is the main advantage of our pads is the ability to prevent excessive creep when substantial overload conditions are maintained for extended periods of time, e.g. train parked or stopped for extended periods, with uneven axle loads.

Air Brake Hose Couplings

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The air brake hose couplings are provided to connect brake pipeline and feed pipeline / MR pipeline throughout the train. The coupling heads of the feed pipe / MR coupling hoses are of opposite design to those of the brake pipe coupling hoses. Installation For installation of the air brake hose couplings, they are provided with threaded nipples on one end of the hoses. These nipples are screwed on / into the anglecock at the both ends of the wagons.

Product Code: ABHC01

Air Brake Hose Couplings

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Product Code: ABHC02

Air Brake Hose Couplings

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Product Code: ABHC03

Air Brake Hose Couplings

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Product Code: ABHC04

Air Brake Hose Couplings

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Product Code: ABHC05

Air Brake Hose Couplings

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Product Code: ABHC06

Air Reservoir Brake Parts

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At Sanrok we manufacture and supply Air Reservoirs for Air Brake Systems. An air reservoir for an air brake system is provided. The air reservoir includes a housing that has a first air chamber, a second air chamber, and a supply air chamber. A first valve is disposed between the supply air chamber and the first air chamber and is configured to allow air to flow from the supply air chamber to the first air chamber. A second valve is disposed between the supply air chamber and the second air chamber and is configured to allow air to flow from the supply air chamber to the second air chamber. Design and Function

A compressed air brake system is divided into a supply system and a control system. The supply system compresses, stores and supplies high-pressure air to the control system as well as to additional air operated auxiliary truck systems (gearbox shift control, clutch pedal air assistance servo, etc.).

Supply system

The air compressor is driven off of the engine either by crankshaft pulley via a belt or directly off of the engine timing gears. It is lubricated and cooled by the engine lubrication and cooling systems. Compressed air is first routed through a series of cooling coils and into an air dryer. The dryer device removes moisture and oil impurities and also may include a pressure regulator and safety valve. As an alternative to the air dryer, the supply system can be equipped with an anti freeze device and oil separator. The compressed air is then stored in a storage reservoir (also called a primary tank) from which it is then distributed via way protection valves into the front and rear brake circuit air tanks, parking brake air tank and an auxiliary equipment air tank. The system also includes various check, pressure limiting, drain and safety valves.

Control system

The control system is further divided into two service brake circuits: the parking brake circuit and the trailer brake circuit. This dual brake circuit is further split into front and rear wheel circuits which receive compressed air from their individual reservoirs for added safety in case of an air leak. The service brakes are applied by means of a brake pedal air valve which regulates both circuits. The parking brake is the air operated spring brake type where its applied by spring force in the spring brake cylinder and released by compressed air via hand control valve. The trailer brake consists of a direct two line system: the supply line (marked red) and the separate control or service line (marked blue). The supply line receives air from the prime mover park brake air tank via a park brake relay valve and the control line is regulated via the trailer brake relay valve. The operating signals for the relay are provided by the prime mover brake pedal air valve, trailer service brake hand control (subject to a country's relevant heavy vehicle legislation) and the prime mover park brake hand control.

Angle Cocks

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Angle Cocks are used in air braked rail vehicles to isolate the brake pipe and or main reservoir pipe at the ends of the vehicle. They are installed at both ends of the vehicle. If the angle cocks are closed, the connected hoses are vented so that the hoses can be uncoupled without any danger.
The angle cock housing has a rubber seal and a spherical design cock bolt / segment. As we move the handle to closed position the cock bolt rotates and is in contact with sealing ring thereby interrupting the communication between the vehicle mounted pipe and the coupling hoses. The coupling hose pressure is vented to atmosphere through vent cap / exhaust holes. When the cock bolt is operated in open position the hollow section of the cock bolt flushes with the direction of the flow thereby permitting an unobstructed air passage. In order to prevent an intermediate cock position handle is provided with a snap action device ensuring that the handle always takes one of the end positions.

Air Reservoir Dual Chamber

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The reservoir consists of two flanged chambers, Emergency Reservoir (3500 cu. in.) and Auxiliary Reservoir (2500 cu. in.), separated by a separation plate. Supporting brackets are integral to the reservoir, two brackets on one end and a single bracket on the other. Brackets are drilled for 1" bolts. At Sanrok we Supply & Manufacture the Dual Chamber Air Reservoir for Air Brake System.

Slack Adjuster

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The Slack Adjuster DRV 2A 450 / 600 is a Brake Slack Adjuster i.e. a device for automatic adjustment of the clearance between brake blocks and wheels. It is built into the brake rigging as a part of a pull rod. This slack adjuster is double acting and rapid working i.e. it quickly adjusts too large or too small clearances to the predetermined value, it has been set to maintain.
The slack adjuster DRV 2A 450 / 600 is composed essentially of the following parts
• Adjuster spindle provided with screw threads of quick pitch.
• The traction unit containing adjuster nut, adjuster tube and adjuster ear.
• The leader nut unit containing leader nut, barrel.
• The control rod with its head.

Brake Cylinders

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Brake cylinders are used in all types of block- braked rail vehicles. The piston thrust produced in the cylinder acts on the blocks through the brake rigging.

Brake cylinders without rigging return spring.

Construction & Operation

These cylinders consist of the cylinder barrel with compressed air connection and cylinder cover. Fitted in the cylinder are the piston with guide tube and the piston return spring. The piston packing seals off the working chamber from the cylinder chamber, which is not under pressure. The mounting bracket serves for attachment of the brake cylinder to the vehicle or bogie frame. The mounting bracket can be either permanently attached to the cylinder body or it cane be removal type.

As the piston rod can freely move through a small angle in all directions, it can follow any lateral deviations necessary without hindrance.

For brake application, compressed air is admitted to the piston moving it against the force of the compression spring. The piston rod is carried along at the same time and transmits the piston thrust to the brake rigging. For release the brake cylinder is exhausted and the compression spring moves the piston back into its initial position. The external rigging return spring provided in case of the B type cylinder ensures that the brake rigging with the piston rod follows the piston.

Range of Brake Cylinders consists of Brake cylinders with following diameter sizes 8", 10", 12", 14", 16".

Product Code: BC01

Brake Cylinders

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Product Code: BC02

Composition Brake Blocks

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Sanrok supplies Non Asbestos Composition Brake Types for all types of rolling Stock requirements. The product range in this category is Low Friction "L" type for Freight / Passenger stock & locomotives. We also supply "LL" type Brake Blocks with a direct replacement of cast iron Brake Blocks. whereby no modification to the brake system or brake rigging is required.

High Friction "K" type series are also supplied for passenger freight and Suburban EMU's. Very High friction "H" type brake blocks are also manufactured co- efficient of friction 0.3 to 0.48.

The Brake blocks supplied confirms to UIC 541 and AAR M-926 Standard.

To,Sanrok Enterpries