Tee Test
A tee must be installed between the pump and control valve and connected to the inlet of the test kit . The outlet port of the
test kit is connected to the tank . Pumps and relief valves can be isolated from the system and checked with the tee test . See
.
Pump Test Using Tee Test Configuration
1 . Plug the line to the control valve .
OUT
HYDRAULIC
MOTOR
IN
CONTROL
VALVE
TEE
PUMP
RELIEF
TANK
Figure 7: Tee test
2 . Open the test kit loading valve fully to read maximum pump flow at zero pressure .
3 . Close the loading valve to increase pressure from zero pressure to rated or maximum pump pressure to determine
pump condition .
4 . The pump flow at rated pressure can now be checked against the pump manufacturer’s specifications . A decrease in flow
from zero pressure to maximum pressure indicates the pump condition . A pump that delivers a constant low flow at zero
pressure and at maximum pressure suggests suction problems .
Relief Valve Test
1 . Put a control valve into a power output mode with the output flow blocked, such as a cylinder at the end of its stroke .
2 . Close the test kit loading valve while viewing the pressure . Pressure will increase until the relief valve opens . Record the
pressure at this point . Repeat to check the relief valve adjustment .
Relief Valve in Separate Housing
1 . Plug any extra outlets .
2 . Close the test kit loading valve and watch the pressure and flow .
3 . Reconnect the control valve to the tee . Put a control valve into a power output mode with the output flow blocked, such
as a cylinder at the end of its stroke .
4 . Close the test kit loading valve while watching the pressure . Pressure will increase until the relief valve opens . Record the
pressure at this point . Repeat to check the relief valve adjustment .
Relief Valves
Often relief valves will start to open before they reach their full pressure flow settings . This can be noted by comparing the
pressure and flow rate readings made in step 4 in
"Pump Test Using Tee Test Configuration"
. Any great decrease in flow rate from
tests made in step 4 in
"Pump Test Using Tee Test Configuration"
indicates a faulty relief valve .
Test Procedures for Test Kit Flow Meters
Page 11
September 2014
VAM-UM-00551-EN-03
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.com
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