Bi-Directional Flow Control Valve

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Bi-Directional Flow Control Valve

• Team 9
• Dale Bernier
• Judy Biddle
• Timothy Brown
• Christopher "Robby" Freeborn-Scott
• 28 January 2010

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Brief Overview

• Background
• Problem/Objective
• Design Concept
• Calculations
• Specifications/Cost
• Test Apparatus

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Introduction Background

• September 11, 2001 Pentagon Attack

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Wet Pipe Sprinkler System
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Problem

• Currently, only one-directional mechanical flow
  valves are available on the market

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Objective

• Design and prototype a purely mechanical
  bi-directional flow control valve

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Single Riser Schematic
Fire Area -only the sprinkler heads affected by
the fire will activate
Riser
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Double Riser Schematic
Riser
Riser
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Bi-Directional Flow Control Valve Schematic
Sprinkler Head
Bi-Directional Flow Control Valve
Spacing of control valve determined by sprinkler
system designer
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Design Selection
Materials Brass, rubber, stainless steel
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Exploded View
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Cost Analysis
Part Name Company Part Number Unit Cost Quantity Cost
Brass Casing, L12, D1.5 McMaster-Carr 8953K241 85.06 1 85.06
Inner Brass Shaft, L6, D0.15 McMaster-Carr 8859K54 13.59 1 pack of 8 13.59
Outer Brass Shaft, L6, D0.5 McMaster-Carr 9105K231 7.38 1 7.38
Rubber Stoppers McMaster-Carr 8784K882 13.68 1 13.69
Rubber O-Rings McMaster-Carr 9557K122 9.34 1 pack of 100 9.34
Compression Spring, K0.56 lb/in McMaster-Carr 9657K47 6.29 1 pack of 12 6.29
Compression Spring, K0.76 lb/in McMaster-Carr 9657K46 6.29 1 pack of 12 6.29
Compression Spring, K0.90 lb/in McMaster-Carr 9657K42 6.29 1 pack of 12 6.29
Compression Spring, K1.18 lb/in McMaster-Carr 9657K71 6.29 1 pack of 12 6.29
Compression Spring, K1.43 lb/in McMaster-Carr 9657K62 6.29 1 pack of 12 6.29
E-clips McMaster-Carr 98408A124 5.22 1 pack of 25 5.22

165.73 TOTAL
834.27 REMAINDER
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Cost Analysis
Original Parts Cost Estimate 141.70 Purchase
Parts Actual Cost 165.73 Budget 1000.00
- 165.73 (Parts
Ordered) 834.27
Does not include labor costs, shipping, or
testing apparatus (fire pump, flow meters, and
valves)
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Cost Benefit

• Sprinkler system cost between 1-5 million
• With valve 2000-10,000 additional cost to
  sprinkler system installation
• Without bi-directional flow control valve
• Same protection is to install duplicate system

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Assumptions

• Gravitational effect neglected
• Spring constants same
• Initial velocity is zero

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Calculations
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Free Body Diagram
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Calculations
Also solved for 70, 80, 90, 100 gpm
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Testing Apparatus
Materials for test apparatus supplied by sponsor
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Progress

• Started CFD Modeling

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Progress

• Parts Ordered and Arrived

Springs
Shafts/Casing
E-Clips
O Rings
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Progress

• Started Machining Parts

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Progress

• Acquiring Test Apparatus Parts
• AFRL Tyndall AFB Fire Department Providing
• Test Site-Tallahassee Fire Training Center

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Conclusion

• Discussed
• Background
• Problem/Objective
• Design Concept
• Cost/Budget
• Calculations
• Test Apparatus
• Progress

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References

• McMaster.com
• Fundamentals of Thermal-Fluid Science (3rd
  edition). By Robert Rizza, Prentice Hall, Inc.,
  2004
• http//upload.wikimedia.org/wikipedia/commons/d/d2
  /The_Pentagon_US_Department_of_Defense_building.jp
  g

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Questions?