How to choose the right valve for pump control
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HOW TO SELECT THE RIGHT VALVE FOR PUMP CONTROL Brian Gongol DJ Gongol & Associates, Inc. July 18, 2014 Heartland Ops Conference Kearney, Nebraska
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Transcript of How to choose the right valve for pump control
HOW TO SELECT THE RIGHT VALVEFOR PUMP CONTROL
Brian GongolDJ Gongol & Associates, Inc.
July 18, 2014
Heartland Ops ConferenceKearney, Nebraska
Dangerous things to do
Get between Donald Trump and a camera
Follow too closely on the Interstate
Butt dial
Try to classify valves comprehensively
Lots of ways to try
Slide Rotary Globe Swing Sphere Diaphragm Sleeve Vertical-lift
Operator/actuation Seating Action Direction of flow Degree of rotation Allowable leakage Number of ports
But let's try a different way
Slide Rotary Globe Swing Sphere Diaphragm Sleeve Vertical-lift
Operator/actuation Seating Action Direction of flow Degree of rotation Allowable leakage Number of ports
Primarily: Purpose
What are we trying to make happen?
Protection
Management
Energy control
Secondarily: Means
How are we going about doing it?
Stopping flow
Throttling flow
1: Protecting by stopping (prior to pump)
1
Foot valve
Usually attached to a screen
Silent check valve
Suction-side check valve
1: Protecting by stopping (prior to pump)
High risk of clogging Introduces friction losses NPSH considerations (raises TDSL) Net energy impact: Priming protection vs. friction losses
2: Protecting by stopping (after pump)
2
Three basic types of post-pump check valve
Swing check
Lift check
Ball check
Lever-and-weight check
Cushioned check
Tilting-disc check
2: Protecting by stopping (after pump)
What's holding it closed? Weight of the ball, spring strength, disc weight
External controls or moving parts? Internal surface flow obstruction Adjustability Seating tightness
3: Protecting by stopping and throttling
3
Electric check
Throttling check
Tilting-disc check with buffers
3: Protecting by stopping and throttling
Controlling or dampening pump startup Controlling or dampening pump shutdown Immediacy of closure on power loss
4: Managing by stopping
4
Gate valves
Gate valves
Gate valves Knife-gate valves Resilient-wedge gate valves Double-disc gate valves
Water-control gates
Water-control gates
Slide gates Weir gates Sluice gates
5: Managing by stopping and throttling
5
Ball
Plug
Butterfly
Rotary pump control
Pinch
Cone
5: Managing by stopping and throttling
Solids passage Tightness of seal Seating type Coefficient of friction (Cv) versus clear opening Ease of seal/seat replacement
6: Energy control to protect (air)
6
Air-release (high-volume)
Vacuum-break
Air/vacuum
Air-release (low-volume)
Combination
6: Energy control to protect (air)
Potential for air accumulation Head to overcome on startup Weight of water column if held by vacuum Sidewall thickness of pipe Age of pipe
7: Energy control to protect (flow)
7
Surge-relief
Surge-anticipator
7: Energy control to protect (flow)
Abruptness of startup Abruptness of shutdown Momentum of water column Tendency to vaporize Pipe friction and tendency to dissipate
8: Energy control to manage
8
Pressure-reducing
Pressure-sustaining
Flow-control
Emergency cut-in
Altitude
9: Highly specialized
9
9: Highly specialized
Needle Solenoid Pilot
10: Backflow prevention
10
To recap
Protection by stopping
Protection by throttling
Protection by energy control
Management by energy control
Management by throttling
Management by stopping
References
Most valve images are courtesy of GA Industries All other images are original work by and copyright reserved
to Brian Gongol
