VELOCITY

Velocity

Velocity Velocity

Velocity Velocity

Peak velocity Peak velocityPressurePressure

VelocityVelocity

PP11

PPvcvc

PP22VV11

VVvcvc

VV22

Calculate Velocity Calculate Velocity

Use equations for S. & S. Manual Use equations for S. & S. Manual

Guidelines: Guidelines: Liquids < 30 ft./sec.Liquids < 30 ft./sec. Use equations for S. & S. Manual Use equations for S. & S. Manual

Calculate Velocity Calculate Velocity

Gases < .33 Mach Gases < .33 Mach Guidelines: Guidelines: Liquids < 30 ft./sec.Liquids < 30 ft./sec. Use equations for S. & S. Manual Use equations for S. & S. Manual

Calculate Velocity Calculate Velocity

Velocities may cause: Velocities may cause:HighHigh

• Erosion - wear• Erosion - wear

• Erosion - wear• Erosion - wear

• Vibration - choked drops and• Vibration - choked drops and resonant frequencies resonant frequencies

Velocities may cause: Velocities may cause:HighHigh

For For

• Hardened Trim• Hardened Trim

ErosionErosion use:use:

angle vs globe, etc. angle vs globe, etc.

• Hardened Trim• Hardened Trim

• Different design -• Different design -

For For ErosionErosion use:use:

To Minimize To Minimize VibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibrationVibration

• Change:• Change: Characteristic Characteristic Flow direction Flow direction CV - (increase - decrease) CV - (increase - decrease)

• $pecial design -• $pecial design - Close tolerance guides, etc. Close tolerance guides, etc.

• Change:• Change: Characteristic Characteristic Flow direction Flow direction Cv - (increase - decrease) Cv - (increase - decrease)

To Minimize To Minimize VibrationVibration

Velocity Velocity Reducing Reducing

• Minimizes• Minimizes Erosion Erosion

Vibration Vibration

• Minimizes• Minimizes

• Eliminates• Eliminates Vibration Vibration Vibration Vibration Vibration Vibration Vibration Vibration

Velocity Velocity Reducing Reducing

Erosion Erosion

Should the Velocity be limited?Should the Velocity be limited?

Should the Velocity be limited?Should the Velocity be limited?

Yes Yes and No! and No!

Yes Yes and No! and No!

Velocity is application and product dependent

Velocity is application and product dependent

For Standard Equipment: For Standard Equipment:

CV dictates valve size CV dictates valve size

Velocity ConclusionsVelocity Conclusions

For Noise Equipment: For Noise Equipment:

Velocity and CV dictate valve size Velocity and CV dictate valve size

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