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Test stand for discrete and proportional valves


The test stand is used for acceptance tests of discrete and proportional hydraulic valves in accordance with GOST 20245-74 (Hydraulic valves. Acceptance rules and methods of tests) and GOST 28971-91 (Hudraulic fluid power. Servovalves. Test methods).

The stand allows to test valves of different design:

  • type of mounting: subplate mounting and manifold mounting
  • type of control: discrete, proportional and servo control
  • control electronics location: integrated and remote

The stand comprises the following basic components:

  • test desk with subpalte, control, measuring and regulating equipment
  • pump station
  • heat exchanger
  • pump station control cabinet (electric)
  • pump station control panel
  • stand control panel
  • computer with software
  • connecting electric cables and hydraulic hoses
  • a set of adapter plates for subplate mounting

Specifications:

 
Description
Value
Reservoir volume, m3
0.6

Working fluid

Fluid purity grade as per GOST 17216-71
- for discrete hydraulics test
- for proportional hydraulics test
Temperature range, °

Mineral oil with kinematic viscosity of 20…50 cSt

 No more than 12
No more than 10
15…60
Max pressure, MPa
32
Max flow, l/min
100
Cooler wattage, kW
15
Work desk dimensions (LxWxH), mm
1,9001,5001,900

The stand was manufactured for Ural Steel (Novotroitzk).

 

DESCRIPTION OF STAND ELECTRIC EQUIPMENT AND SOFTWARE

Software is used to:

  • Process signals from stand and pump station sensors
  • Display measurement results on the monitor screen
  • Control stand and pump station electric equipment (relay, light indication) using the algorithm
  • Control hydraulics test procedure (to set the commands)
  • Display record data on hydraulics tests (connection diagrams)
  • Archive data during tests

Pump station control algorithm allows to:

  • Control pump station parameters (oil level, temperature, etc.)
  • Control electric part (electric drive of the main pump)
  • Generate signals permitting operation or emergency shutdown of the pump station with light indication

The following parameters of discrete valves are checked during test at the stand:

  • Functioning
  • Inside and outside leak resistance
  • Relation of set pressure measurement to flow
  • Adjustment smoothness and setup range
  • Reduced pressure change after change of inlet pressure or flow
  • Pilot valve flow
  • Relation of flow to pressure difference at inlet and outlet

The following parameters of proportional valves are checked during test at the stand:

  • Functioning
  • Inside and outside leak resistance
  • Pressure gain
  • Zero offset
  • Flow gain
  • Hysteresis and polarity


SHORTLIST OF HYDRAULIC VALVES WHICH CAN BE TESTED AT THE STAND

Valve name
Marking
Manufacturer
1. Discrete directional control valves:
Hydraulic directional control valve
4WE6J6X/EG24N9K4B06
Rexroth
Hydraulic directional control valve
4WEH16J7X/6EG24N9S2K4
Rexroth
Hydraulic directional control valve
VE 6.44.31/
Gidroapparat
Hydraulic directional control valve
VEX 16.44.G24N
Gidroapparat
Hydraulic directional control valve
1R323AL4-44RG24N10
Gidroapparat
2. Proportional directional control valves and servo valves:
Servo valve
4WSE3EE16-1X/300B8-315K9EVSO3
Rexroth
Proportional directional control valve
4WRDE16V125L-5x/6L15Z9/M-280
Rexroth
Proportional directional control valve
3DR16P6X/200YG24K6VE1-3
Rexroth
3. Pressure regulating valves:
Direct acting relief valve
DBDS20K1X/315
Rexroth
Pressure reducing valve
DR30-5-5X\200Y
Rexroth
Pump protection unit
DBAW16BF2-2X315EG24N9K4A08
Rexroth
Safety and shut-off block
SAF10M12T210A-S13
HYDAC
Brake valve
FD16PA2X/B03V
Rexroth
Drop rate braking valve
SB17G12
HAWE
Relief valve
MKPV-32/3S3V
GSKTB GA
Pressure reducing valve
MKPV-32/3S2R
Gidroprivod
4. Check valves, pilot operated check valves and throttles:
Pilot operated check valve
SL52PA1-1x/
Rexroth
Double throttle sandwich plate mounting
Z2FS10-5-3 X\V
Rexroth
Integral check valve
M-SR30KE05-1x/
Rexroth
Throttle
MG30G1X\V
Rexroth
Check valve
1 32/32
Gidravlik
5. Control instrumentation:
Pressure relay
HED3OA3X/200Z6L24
Rexroth
Pressure head
P20V-200bar
RPM
Pressure relay
EDS1691-P-C-200-000
HYDAC
 
Up to 100 types of hydraulic valves can be tested at the stand.