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 |
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
|
1,900õ1,500õ1,900
|
The stand was manufactured for Ural Steel (Novotroitzk).

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
|
3DRÅ16P6X/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
|
1ÌÊÎ 32/32
|
Gidravlik
|
5. Control instrumentation:
|
||
Pressure
relay
|
HED3OA3X/200Z6L24
|
Rexroth
|
Pressure
head
|
P20V-200bar
|
RPM
|
Pressure
relay
|
EDS1691-P-C-200-000
|
HYDAC
|