How to Test the Performance of a New Valve Actuator
Publish Time: 04/03 2026 Author: Site Editor Visit: 1
1. Visual Inspection
Check Item
Acceptance Criteria
Model number
Matches purchase order
Torque / thrust rating
Meets application requirement
Mounting flange (ISO 5211)
Correct size (F03, F05, F07, F10, etc.)
Drive type (square, keyed, etc.)
Matches valve stem
Port connections (NPT, BSPT, G)
Correct thread type
Solenoid valve (if included)
Correct voltage (24V DC, 110V AC, 220V AC)
Positioner (if included)
Correct signal type (4–20mA, 0–10V)
Physical damage
No cracks, dents, or corrosion
Nameplate
Legible, matches documentation
2. Bench Test (No Load)
2.1 Pneumatic Actuator
Step
Action
Expected Result
1
Connect air supply (4–8 bar)
No leaks at fittings
2
Apply air to port A
Actuator rotates/strokes fully
3
Apply air to port B
Actuator returns to original position
4
Cycle 5–10 times
Smooth, consistent movement
5
Listen for abnormal noise
No grinding or clicking
2.2 Electric Actuator
Step
Action
Expected Result
1
Connect power (verify voltage)
No error indicators
2
Apply open command
Actuator rotates/strokes fully
3
Apply close command
Actuator returns to original position
4
Cycle 5–10 times
Smooth, consistent movement
5
Check manual override
Operates freely
Test Record Template
Parameter
Measured Value
Specification
Pass/Fail
Full stroke time (open)
____ sec
≤ ____ sec
Full stroke time (close)
____ sec
≤ ____ sec
Current draw (electric)
____ A
≤ ____ A
Air consumption (pneumatic)
____ L/min
≤ ____ L/min
Noise level
____ dB
≤ ____ dB
3. Torque / Thrust Test
For Quarter-Turn Actuators (Ball, Butterfly, Plug)
Test Point
Method
Acceptance
Breakaway torque
Measure torque at 0°
Within spec (±10%)
Running torque
Measure torque at 45°
Within spec (±10%)
Seating torque
Measure torque at 85–90°
Within spec (±10%)
For Linear Actuators (Gate, Globe)
Test Point
Method
Acceptance
Breakaway thrust
Measure at start of stroke
Within spec (±10%)
Running thrust
Measure mid-stroke
Within spec (±10%)
Seating thrust
Measure at end of stroke
Within spec (±10%)
Torque Measurement Options
Method
Accuracy
Equipment Required
Torque wrench
±3–5%
Torque wrench, adapter
Inline torque sensor
±0.5–1%
Torque sensor, display
Pressure-to-torque (pneumatic)
±5–10%
Pressure gauge, calculation
4. Cycle Test
Purpose
Validate actuator durability and repeatability under simulated operating conditions.
Test Protocol
Parameter
Recommendation
Number of cycles
100–500 (benchmark) or 10% of rated life
Cycle speed
Normal operating speed
Load
Connected to valve or equivalent torque load
Ambient temperature
Room temperature (or application condition)
Monitoring
Stroke time, current draw, air consumption, leakage
Cycle Test Record
Cycle #
Open Time (sec)
Close Time (sec)
Current (A)
Notes
1
50
100
200
500
Acceptance Criteria: No significant change (>10%) in stroke time, current draw, or torque throughout the test.
5. Leak Test (Pneumatic Actuators)
External Leak Test
Location
Method
Acceptance
Air fittings
Soapy water
No bubbles
Housing seals
Soapy water
No bubbles
Shaft seals
Soapy water
Minimal bubbles (≤1 bubble/10 sec)
Solenoid valve exhaust
Listen / feel
No continuous leakage
Internal Leak Test (Cross-Port Leakage)
Step
Action
Expected Result
1
Apply pressure to port A, port B open
No air from port B
2
Apply pressure to port B, port A open
No air from port A
3
Measure pressure decay
≤5% over 1 minute
Acceptable Leakage Rates
Actuator Type
External Leakage
Internal Leakage
New actuator
0
<0.1% of supply
In-service
<1 bubble/10 sec
<1% of supply
6. Position Accuracy Test (Modulating Actuators)
Test Setup
Signal generator (4–20mA or 0–10V)
Position feedback measurement (potentiometer, encoder, or external sensor)
Data recorder
Test Points
Signal Value
Expected Position
Measured Position
Error (%)
4 mA (0%)
0° / 0%
____° / ____%
8 mA (25%)
90° / 25%
____° / ____%
12 mA (50%)
180° / 50%
____° / ____%
16 mA (75%)
270° / 75%
____° / ____%
20 mA (100%)
360° / 100%
____° / ____%
Hysteresis Test
Step
Action
Expected Result
1
Ramp signal from 4mA to 20mA
Record positions
2
Ramp signal from 20mA to 4mA
Record positions
3
Calculate hysteresis
≤1% of full scale
Acceptance Criteria
Actuator Grade
Linearity Error
Hysteresis
Repeatability
Standard
±2–5%
≤3%
≤2%
High-grade
±0.5–1%
≤1%
≤0.5%
Precision
±0.2–0.5%
≤0.5%
≤0.2%
7. Fail-Safe Test
For Spring Return Pneumatic Actuators
Test
Procedure
Acceptance
Air-off return
Remove air supply while at open position
Returns to closed within spec time
Return speed
Measure time from air-off to fully closed
≤2 seconds (or per spec)
Spring integrity
Cycle 5 times, listen for unusual sounds
Smooth, quiet operation
For Electric Actuators with Backup
Test
Procedure
Acceptance
Power-off return
Remove power while at open position
Returns to fail-safe position
Backup battery/spring
Verify operation without main power
Full stroke achieved
Return time
Measure time to fail-safe position
Within specification
8. Environmental Test (Optional)
Temperature Test
Condition
Test Method
Acceptance
Low temperature
Operate at -20°C / -4°F
No freezing, smooth operation
High temperature
Operate at +80°C / +176°F
No seal failure, consistent torque
Thermal cycling
Cycle between extremes
No permanent deformation
IP Rating Verification
IP Rating
Test Method
Acceptance
IP65
Water jet (12.5mm nozzle)
No water ingress
IP66
Powerful water jets
No water ingress
IP67
Immersion (1m for 30 min)
No water ingress
IP68
Immersion (specified depth)
No water ingress
9. Mounted Test (Valve Connected)
After bench testing, connect the actuator to the actual valve and perform the following:
Test
Procedure
Acceptance
Mounting alignment
Check for binding or resistance
Smooth manual operation
Full stroke verification
Cycle fully open to fully closed
Valve reaches both stops
Seat shut-off
Pressure test across closed valve
Zero leakage (or class VI)
Dynamic response
Step changes in signal
Stable, no hunting
Limit switch setting
Verify open/closed indication
Correct signal at each position
10. Test Equipment Checklist
Equipment
Purpose
Air compressor (clean, dry)
Pneumatic actuator testing
Pressure regulator with gauge
Control test pressure
Power supply (variable)
Electric actuator testing
Multimeter
Voltage, current, continuity
Signal generator (4–20mA / 0–10V)
Modulating actuator testing
Torque wrench or sensor
Torque verification
Stopwatch
Stroke time measurement
Soapy water solution
Leak detection
Infrared thermometer
Temperature monitoring
Data logger (optional)
Long-term cycle recording
11. Test Report Template
Section
Information
General Information
Test date
Tester name
Actuator model
Serial number
Visual Inspection
Pass / Fail (notes)
Bench Test
Pass / Fail (data)
Torque/Thrust Test
Pass / Fail (data)
Cycle Test (100 cycles)
Pass / Fail
Leak Test
Pass / Fail
Position Accuracy
___% error
Hysteresis
___%
Fail-Safe Test
Pass / Fail
Mounted Test
Pass / Fail
Overall Result
Pass / Fail
Recommendation
Ready for service / Needs repair / Reject
Common Test Failures & Causes
Failure
Most Likely Cause
Won't stroke fully
Insufficient pressure/power, mechanical bind
Slow operation
Low pressure, undersized supply lines
External air leak
Loose fittings, damaged seals
Cross-port leakage
Worn piston seals
Poor positioning accuracy
Positioner calibration, feedback linkage
Excessive current draw
Mechanical binding, motor issue
Fail-safe fails to return
Broken spring, debris in spring chamber
Overheating
Duty cycle exceeded, poor ventilation
Ivan (Mobile:+86-18968769287)
Wechat:+86-18968769287
Website：www.kinko-flow.com
