Railway Braking Systems / Distributor Valve (DV) Test & Validation / RDSO‑Compliant Test Programme · Model A4557 / Noida · India 2026 · Product Page

CMCDTB · MODEL A4557

Distributor valve testing, verified to 10 kg/cm², every cycle.

A computerized, microprocessor-controlled test bench for railway Distributor Valves (DV) — automatic and A9 manual test modes, an integrated Data Acquisition System, and a 2400 LPM high-pressure air circuit validate charging, leakage, braking response and overcharge protection to RDSO standards, for coach or wagon, loaded or empty.

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Computerized Microprocessor Controlled DV Test Bench — Neometrix Model A4557, gauge panel, pneumatic module and control rack with industrial PC, shop-floor installation

Fig · 01 Computerized DV Test Bench — gauge panel, pneumatic module and IPC control rack (Model A4557)

Qualification testing supported to:

DEF STAN STANAG MIL-SPEC

Max Pressure

10Kg/cm²

Air Supply

8–10Kg/cm²

Flow Rate

2400LPM

Temperature

Ambient

UPS Backup

1HR

Overview

Every distributor valve, proven before it runs.

The Distributor Valve is the core control element of a railway air-brake system. If it doesn't charge, apply, release and re-feed correctly, the train's braking performance is compromised — which is why every DV needs to be proven on a dedicated test bench before it goes back into service.

Computerized Microprocessor Controlled DV Test Bench — Neometrix test bench with pneumatic module, gauge panel and control rack on a shop floor

Fig · 02 Computerized DV Test Bench — pneumatic module and gauge panel, control rack alongside

The Microprocessor Controlled DV Test Bench is a high-precision system built for testing Distributor Valves used in railway braking systems — engineered for railway maintenance depots, rolling stock manufacturers, and research facilities. It ensures safety, efficiency, and compliance with RDSO and international railway standards.

Equipped with automated and manual testing modes, an integrated Data Acquisition System (DAQ), and a high-pressure air testing capability, the bench performs comprehensive functional tests — brake application, release timing, leakage detection, sensitivity analysis, and overcharge protection — on distributor valves for both coach and wagon applications, loaded or empty.

A user-friendly interface, real-time monitoring, and detailed report generation turn every test cycle into a traceable, auditable record.

The test bench simulates real-world railway braking conditions by controlling air-pressure variations and monitoring braking responses under different scenarios — identifying faults, leaks, sensitivity issues, and response delays in distributor valves before they are deployed in active railway service.

System Architecture

Six subsystems, one controlled test.

Control, pneumatics, data acquisition and physical handling are each handled by a dedicated subsystem — brought together under a single microprocessor-controlled test sequence.

SYS · 01

Microprocessor Control & Automation

Automatic mode runs a predefined test sequence with the option to select individual tests. A9 Manual (A9 Operated) mode lets the operator drive the test via an A9 Driver's Brake and toggle switches, chosen with a Mode Selector Switch.

Automatic · A9 Manual Mode

SYS · 02

Data Acquisition & Reporting

Industrial PC (IPC) with a GUI touchscreen provides real-time graphical pressure-vs-time monitoring, automated compliance report generation, and printer integration for on-demand hard copies.

IPC · Real-Time DAQ

SYS · 03

High-Pressure Pneumatic Circuit

Compressed-air working medium rated to 10 Kg/cm², fed from an 8–10 Kg/cm² supply at up to 2400 LPM flow — matching real railway braking-pressure conditions.

10 Kg/cm² · 2400 LPM

SYS · 04

Adjustable Brake Cylinder Mounting

Brake cylinder stroke length is manually adjustable on the machine to match the diameter of the brake cylinder under test, covering both coach and wagon configurations.

Coach & Wagon Compatible

SYS · 05

UPS Backup Power

An uninterruptible power supply provides up to one hour of backup power, protecting an in-progress test and its logged data from short interruptions to mains supply.

Up to 1 Hour Backup

SYS · 06

DV Overhauling Table & Trolley

A dedicated DV Overhauling Table supports maintenance, repair and reassembly of distributor valves; an adjustable DV Mounting & Dismantling Trolley assists safe handling and transport.

Overhauling & Handling

Test Capabilities

Real DAQ screens, real test data.

Every test runs against a live pressure-vs-time trace on the operator screen — the same DAQ software used on delivered Neometrix DV test benches on the shop floor.

T · 01 Charging

Charging Time Test

Measures the time required for the Auxiliary Reservoir (AR) and Control Reservoir (CR) to charge from empty up to full working pressure, confirming the braking system reaches full pressure within the expected time window before any brake test is run.

Independent AR and CR pressure-vs-time channels, logged and plotted live
Confirms both reservoirs reach target pressure before proceeding
Forms the baseline reference for every subsequent test in the sequence

Neometrix DAQ software — Charging Time Test screen, pressure vs time plot for AR and CR reservoirs, DV Test Bench A5895 local control panel

DAQ Screen · Charging Time Test · Pressure vs Time

T · 02 Leakage

Leakage Test (Full Service / Emergency / Release)

Holds the system at a target pressure and monitors for decay across full-service application, emergency application, and release conditions — catching air leaks that could compromise braking performance before the DV goes back into service.

BC and BP charging results checked against configured upper/lower limits
Pass/fail leakage verdict logged automatically against each condition
Zero manual gauge-watching — the DAQ flags a leak the moment it occurs

Neometrix DAQ software — Leakage Full Service Test screen, pressure vs time plot with BC and BP charging test results

DAQ Screen · Leakage · Full Service Test

Full Test Schedule

Thirteen tests, one predefined sequence.

Beyond charging and leakage, the bench runs a complete railway braking-response programme — each test selectable individually or run end-to-end in Automatic Mode.

Brake Application Time — Full Service and Emergency application, brake-cylinder pressurisation time
Brake Release Time — Full Service and Emergency release response
Maximum Brake Cylinder Pressure — verifies the DV generates required BC pressure under both conditions
Sensitivity Test — response speed and accuracy to minor brake-pipe pressure fluctuations
Insensitivity Test — confirms no false brake application on insignificant pressure changes
Availability of Brake Pipe Pressure — brake pipe pressure maintained at all times

Graduated Application Test — incremental braking force application, smooth and controlled
Graduated Release Test — incremental braking force release, no sudden jerks
Re-feeding Test — verifies the DV restores pressure levels to maintain braking control
Overcharge Protection Test — prevents over-pressurisation that could damage braking components
Quick Release Valve Test — efficiency of excess-pressure discharge on demand

Control & Traceability

Every result, tied to a valve.

Before a test runs, the operator logs the DV against POH number, DV housing number, make, type, tester ID and shift — so every pressure trace in the report ties back to a specific, identifiable valve.

Neometrix DV Test Bench local control panel and IPC rack, cabinet door open, industrial computer and rack-mounted electronics

Fig · 05 IPC control rack — industrial computer, local control panel, rack-mounted electronics

Neometrix DAQ software — Distributor Valve Details entry screen capturing POH number, DV housing number, make, type of DV, tester number and shift

Fig · 06 DAQ screen — Distributor Valve Details entry, captured before every test

Operating Modes

Automatic sequencing, or A9 manual control.

A single Mode Selector Switch chooses between fully automated testing and direct A9 manual operation, from the same touchscreen main menu.

Neometrix Computerized DV Test Bench, Model A4557-I, full front view with gauge panel, pneumatic module and adjacent control racks

Fig · 07 Computerized DV Test Bench — Model A4557-I, full front view with gauge panel

Automatic Mode executes the full test sequence with minimal operator intervention: charging, leakage, brake application/release, sensitivity, insensitivity, re-feeding, graduated application/release, overcharge protection and quick release — run back-to-back, with the option to select and re-run any individual test.

A9 Manual (A9 Operated) Mode hands control to the operator via an A9 Driver's Brake and toggle switches, simulating real-world railway brake applications by hand — useful for training, troubleshooting, and detailed component analysis where an automated sequence isn't the right tool.

Both modes log to the same DAQ and reporting pipeline, so manual and automatic test runs produce the same traceable, printable test record.

Accessories

Overhauling and handling, built in.

Testing a distributor valve is only half the workflow — the bench ships with dedicated hardware for the maintenance work either side of the test.

Neometrix DV Overhauling Table — stainless-steel workbench with drawers, cabinets and two rotating fixture stations for distributor valve maintenance

Fig · 08 DV Overhauling Table — stainless-steel workbench with rotating fixture stations

The DV Overhauling Table is a dedicated stainless-steel workbench with lockable drawers and cabinets, fitted with two rotating (360°) fixture stations for holding a distributor valve steady during maintenance, repair and reassembly.

The DV Mounting & Dismantling Adjustable Trolley assists in the safe handling and transportation of heavy DV units between the overhauling table and the test bench, reducing manual handling risk and speeding up throughput on the shop floor.

Gallery

The bench, on the shop floor.

Real production photographs and real DAQ screens from delivered Neometrix Computerized DV Test Benches.

Computerized DV Test Bench Model A4557-I — full front view, gauge panel and control racks

Computerized DV Test Bench — shop-floor installation view with pneumatic module and control rack

Neometrix DAQ software — Performance Test Result of Distributor Valve printed report screen, full test log

Neometrix DAQ software — Main Screen with Authentication, Test, Test Setup, Maintenance and Calibration options

Neometrix DAQ software — Leakage Full Service Test pressure vs time chart, local control panel

Neometrix DV Overhauling Table — stainless-steel workbench with rotating fixture stations

Downloads

Catalog & drawings.

General product catalog, DV Overhauling Table assembly drawing, and pneumatic circuit diagram for Model A4557, available as PDF.

Catalog

General Catalog — Model A4557

PDF · 11 pages

Drawing · Design 1

DV Overhauling Table — Assembly Drawing

PDF · 1 page

DV Test Rig pneumatic circuit diagram thumbnail

Drawing · Design 2

Pneumatic Circuit Diagram — DV Test Rig

PDF · 1 page

Specifications

Full technical parameters.

Key parameters for the standard Computerized Microprocessor Controlled DV Test Bench configuration, Model A4557.

System Type	Computerized Microprocessor Controlled DV (Distributor Valve) Test Bench
Working Medium	Compressed Air
Maximum Pressure Rating	10 Kg/cm²
Air Supply Pressure Range	8–10 Kg/cm²
Flow Rate	2400 LPM
Temperature Range	Ambient
Brake Cylinder Compatibility	Manually adjustable stroke length · Coach and Wagon distributor valves, loaded or empty
Operating Modes	Automatic Mode (predefined test sequence, individual test selection) · A9 Manual (A9 Operated) Mode
Mode Selection	Mode Selector Switch
Manual Mode Controls	A9 Driver's Brake & toggle switches
Data Acquisition	Industrial PC (IPC) with GUI touchscreen · real-time graphical pressure-vs-time monitoring
Reporting	Automated compliance report generation · printer integration
Test Record Fields	POH number, DV housing number, make, type of DV, tester number, shift
Power Backup	UPS · up to 1 hour of uninterrupted power
Compliance	RDSO-approved brake cylinder & air reservoir standards
Accessories	DV Overhauling Table (rotating fixture stations) · DV Mounting & Dismantling Adjustable Trolley
Tests Performed	Charging Time · Leakage · Brake Application/Release Time (Full Service & Emergency) · Maximum BC Pressure · Sensitivity · Insensitivity · Graduated Application/Release · Re-feeding · Brake Pipe Pressure Availability · Overcharge Protection · Quick Release Valve

Applications

Where it runs.

Railway distributor valve testing, overhauling and quality assurance across maintenance, manufacturing, and R&D.

A · 01Railway maintenance depots — safety compliance and operational reliability testing

A · 02Railway workshops — fault detection and preventive maintenance of distributor valves

A · 03Brake system manufacturers — quality control and performance validation

A · 04Rolling stock manufacturers — pre-installation testing of braking systems

A · 05Research & development centres — railway braking technology innovation and testing

A · 06Testing distributor valves for coaches, loaded or empty

A · 07Testing distributor valves for wagons, loaded or empty

A · 08DV overhauling, repair and reassembly workflows

In Depth

The complete technical read.

Engineering narrative for railway rolling-stock engineers, depot maintenance teams, and procurement managers who want the full picture before committing to a test programme.

Why distributor valve testing matters

The Microprocessor Controlled DV Test Bench is a precision-engineered system designed for testing, analyzing, and validating Distributor Valves (DV) used in railway braking systems. It ensures that railway braking components meet safety, efficiency, and performance standards before being installed in rolling stock. This system is widely used in railway maintenance depots, rolling stock manufacturing plants, research and development facilities, and brake system production units.

The test bench simulates real-world railway braking conditions by controlling air-pressure variations and monitoring braking responses under different scenarios. The test results help identify faults, leaks, sensitivity issues, and response delays in distributor valves before they are deployed in active railway service.

Key features, in detail

Advanced microprocessor control — enables high-speed data processing and precision in test execution.
Fully automated testing — executes predefined test sequences with minimal human intervention.
Manual testing mode (A9 Operated Mode) — allows manual control via A9 Driver's Brake and toggle switches, simulating real-world railway brake applications.
Integrated Data Acquisition System (DAQ) — records, processes, and logs test results with real-time graphical analysis.
High-pressure testing capability — operates at 10 Kg/cm² to match real-world railway braking pressures.
Adjustable brake cylinder stroke — customizable settings allow compatibility with different brake cylinder diameters.
High flow rate — 2400 LPM air supply ensures efficient testing.
Comprehensive test reporting — generates detailed logs, performance charts, and compliance reports.
Multi-mode operation — supports automatic and manual test execution.
User-friendly GUI interface — simplified control through an Industrial PC (IPC) with touchscreen support.
UPS backup system — prevents power interruptions, ensuring continuous testing.

Testing capabilities, by category

The DV Test Bench performs a wide range of functional and performance tests to ensure the correct operation of distributor valves. These tests help validate braking efficiency, pressure control, leak prevention, and emergency braking functionality.

1. Charging and leakage tests

Charging Time Test measures the time required to charge the Auxiliary Reservoir (AR) and Control Reservoir (CR), ensuring the braking system achieves full pressure within the expected time frame. Leakage Test detects potential air leaks in the system that could compromise braking performance and cause safety failures.

2. Brake application and release tests

Brake Application Time Test determines the time taken for the brake cylinder to pressurize and engage — covering Full Service Application (normal railway braking) and Emergency Application (instant pressure buildup). Brake Releasing Time Test measures how fast the brakes release after application, for both Full Service and Emergency Brake Release. Maximum Brake Cylinder Pressure Test verifies whether the distributor valve can generate the required brake pressure under both conditions.

3. Sensitivity and control response tests

Sensitivity Test measures how quickly and accurately the distributor valve responds to minor pressure fluctuations. Insensitivity Test ensures the braking system does not react unnecessarily to insignificant pressure changes, preventing false brake applications. Graduated Application and Graduated Release Tests evaluate the distributor valve's ability to apply and release braking force in increments, ensuring smooth and controlled braking without sudden jerks. Re-feeding Test verifies if the valve can restore pressure levels effectively to maintain braking control. Availability of Brake Pipe Pressure ensures the brake pipe maintains necessary pressure levels at all times. Overcharge Protection Test assesses whether the system can prevent over-pressurization, which could damage braking components. Quick Release Valve Test tests how efficiently the system discharges excess pressure when needed.

Operating modes

The system features dual working modes, allowing flexibility for various testing scenarios.

Automatic Mode

Tests are executed automatically using a predefined test sequence. Operators can also select individual tests manually when needed — ensuring consistency, repeatability, and precision in test results.

Manual (A9 Operated) Mode

The operator manually controls the tests using an A9 Driver's Brake and toggle switches, allowing real-world simulation of braking actions under controlled conditions — useful for training, troubleshooting, and detailed component analysis.

Mode selection

Operators switch between Automatic Mode and A9 Operating Mode via a Mode Selector Switch.

Data acquisition & reporting system (DAQ)

Real-time data monitoring — captures and logs pressure levels, timing data, and brake response parameters.
Graphical analysis — provides visual representations of test performance, including pressure curves and response-time charts.
Industrial PC (IPC) with GUI — touchscreen and keyboard operation for seamless test control.
Automated report generation — detailed test logs, compliance reports, and maintenance documentation.
Printer integration — on-demand printing of test results for record-keeping and analysis.
UPS backup — ensures uninterrupted operation, preventing data loss and system downtime.

Additional accessories

DV Overhauling Table — dedicated workbench for maintenance, repair, and reassembly of distributor valves.
DV Mounting & Dismantling Adjustable Trolley — assists in safe handling and transportation of heavy components, reducing manual labour.

Technical specifications

Working Medium	Compressed Air
Maximum Pressure Rating	10 Kg/cm²
Air Supply Pressure Range	8–10 Kg/cm²
Flow Rate	2400 LPM
Temperature Range	Ambient
Brake Cylinder Compatibility	Adjustable stroke length for different brake cylinder sizes
Compliance	RDSO-Approved Brake Cylinder & Air Reservoir

Applications & industry use

Railway maintenance & testing facilities — ensures safety compliance and operational reliability.
Railway workshops & depots — used for fault detection, preventive maintenance, and brake system validation.
Brake system manufacturers — supports quality control and performance validation.
Rolling stock manufacturers — enables pre-installation testing for braking systems.
Research & development (R&D) centres — supports innovation and performance testing in railway braking technology.

Conclusion

The Computerized Microprocessor Controlled DV Test Bench brings a single, RDSO-aligned test programme to a component that cannot afford to fail in service. Automated and manual test modes, real-time DAQ, and traceable reporting turn distributor valve qualification from a manual, gauge-watching exercise into a repeatable, auditable process — for every coach and wagon DV that passes through the depot.

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 What is the Computerized Microprocessor Controlled DV Test Bench?

It is a microprocessor-controlled test system, designed and manufactured by Neometrix Engineering Pvt Ltd, India, used to test and validate Distributor Valves (DV) used in railway braking systems. It performs charging, leakage, brake application/release, sensitivity and overcharge-protection tests under automated or manual control.

Q · 02 What is a Distributor Valve (DV) in a railway braking system?

The Distributor Valve is the core control valve of a railway air-brake system — it senses brake pipe pressure changes and directs compressed air to and from the brake cylinder to apply or release the brakes. Testing it correctly before it is fitted to rolling stock is critical to railway safety.

Q · 03 What pressure and flow rate does the DV Test Bench operate at?

The bench uses compressed air as the working medium, with a maximum pressure rating of 10 Kg/cm², an air supply pressure range of 8–10 Kg/cm², and a flow rate of up to 2400 LPM, at ambient temperature.

Q · 04 What tests does the bench perform on a Distributor Valve?

It performs charging time, leakage, brake application time, brake release time, maximum brake cylinder pressure, sensitivity, insensitivity, graduated application, graduated release, re-feeding, brake pipe pressure availability, overcharge protection, and quick release valve tests.

Q · 05 What is the difference between Automatic and A9 Manual mode?

In Automatic Mode, the system runs a predefined test sequence with the option to select individual tests. In A9 Manual (A9 Operated) Mode, the operator controls the test manually via an A9 Driver's Brake and toggle switches, simulating real-world brake application. Operators switch between the two using a Mode Selector Switch.

Q · 06 Does the DV Test Bench comply with RDSO requirements?

Yes. The system is designed to work with RDSO-approved brake cylinders and air reservoirs, and structures its test sequence around the charging, leakage, sensitivity and braking-response checks required for railway distributor valve qualification.

Q · 07 Can it test distributor valves for both coaches and wagons?

Yes. The brake cylinder stroke length is manually adjustable according to the diameter of the brake cylinder, allowing the same bench to test distributor valves used on coaches and wagons, loaded or empty.

Q · 08 What does the DAQ and reporting system provide?

An Industrial PC (IPC) with a GUI touchscreen provides real-time graphical monitoring of pressure-versus-time data during each test, captures DV traceability details (POH number, DV housing number, make, type, tester and shift), and generates automated test reports with printer integration.

Q · 09 What accessories are supplied with the system?

A dedicated DV Overhauling Table for maintenance, repair and reassembly of distributor valves, and a DV Mounting & Dismantling Adjustable Trolley for safe handling and transport of DV units, are supplied alongside the test bench.

Q · 10 What happens to a running test if power is interrupted?

The bench includes a UPS backup system providing up to one hour of uninterrupted power, so an in-progress test and its logged data are protected from short power interruptions.

Q · 11 How can I get a quotation for the DV Test Bench?

You can request a quotation by contacting Neometrix Engineering Pvt Ltd through the website at https://neometrixgroup.com/products/computerized-microprocessor-controlled-dv-test-bench-v1 or by reaching out via email or phone.

Get a proposal

Tell us your DV type
and test-bay requirements.

We size the pneumatic circuit, configure the DAQ and reporting workflow, and walk through commissioning and operator training with your maintenance team before you commit.

Request proposal +91 7777 876 876

Distributor valve testing, verified to 10 kg/cm², every cycle.

Every distributor valve, proven before it runs.