Distributor Valve for Air-Brake System of Passenger Stock on Indian Railways.
M-DV Series
This Automated Test Rig has been specially designed as per RDSO Specifications — RDSO/2011/TG/L/DV Endurance Test Rig/003 (Rev-01)(App 2013) — for Endurance Testing of Distributor Valves of Railway Locomotives.
Compatible Distributor Valve Types
Capabilities
Full damper and valve characterisation as required by RDSO periodic inspection and EN 13802 type-approval.
Generates complete F-V characteristic curves at multiple velocities. The primary acceptance test for railway dampers — plots damping force versus piston velocity for compression and rebound strokes.
Sustained stroke cycling at rated velocity with continuous monitoring of oil level and external seepage. Detects seal degradation and quantifies fluid loss per RDSO acceptance limits.
Low-speed ramp to identify the exact pressure at which internal blowoff and shim-stack valves open — critical for tuning ride comfort and ensuring correct valve assembly.
Computes the damping coefficient (C) from force and velocity data at defined operating points. Software auto-calculates and compares against min/max acceptance bands per EN 13802.
Optional environmental chamber subjects the damper to –40 °C to +80 °C while under test. Validates cold-start performance and thermal fade — mandatory for extreme-climate rolling stock.
Extended cycling at service amplitude and frequency to validate damper life. Monitors force output degradation cycle-by-cycle and flags the point of functional failure.
Brake application / release timing (full service and emergency)
Maximum brake cylinder pressure
Sensitivity and insensitivity checks
Graduated application and release
Re-feeding test
Overcharge protection test
Quick release valve test
Leakage test
Brake application time (full service & emergency)
Brake release time (full service & emergency)
Availability of brake pipe pressure
Quick release valve function
Charging time for AR
Charging time for CR
Full service application time
Release time after full service application
Max. brake cylinder pressure after full service
Protection against overcharging of CR
Sensitivity
Insensitivity
Graduated application
Pressure tightness in brake released & applied condition
Graduated release
Refeeding test
Standard Equipment
Closed-loop servohydraulic system delivers precise force and velocity control across the full operating envelope — from quasi-static seal tests to 20 Hz dynamic excitation.
Software automatically generates F-V diagrams at user-defined velocity steps, overlays acceptance bands, and produces pass/fail reports — reducing operator intervention to a minimum.
Dual- and quad-station configurations available for high-throughput workshop environments. Each station operates independently with shared hydraulic power.
Built-in report templates formatted for RDSO type-approval and periodic inspection submission — PDF, Excel, and CSV export with digital signatures.
Modular mounting adapters for different damper eye-bush and clevis configurations. Changeover between primary and secondary damper types in under 5 minutes.
Force and displacement limit switches, hydraulic pressure relief, and guarded test zone with light-curtain access protection for safe operator-attended testing.
Product Range
After Sales
On-site and in-house calibration of testing machines and sensors
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Application engineering, test method development, and lab planning
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Safe disassembly, transport, and re-commissioning of testing machines
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Modernise legacy or imported test rigs with new controls and sensors
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Annual maintenance contracts (AMC) for all testing machines
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Tell us your damper type, force range, and applicable RDSO specification — our engineers will configure the right M-DV system and quote quickly.
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