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Copyright 2007 Fluor Corporation

Valves

Lesson Objective

Lesson Objective

Introduction To Valves

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Basic Types of Valves Flow Characteristics

Gate ValveRelief

Valve Globe Valve

Horizontal

Lift Check ValveSwing Check

Valve

Basic Types of Valves & Flow Characteristics

Angle

Valve

Y Valve

Plug

Valve

The Gate Valve

Block Valve: Either Opened or Closed

Note: Handwheel is

stationary while stem rises.

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Flanged

Butt Welded

Screwed and Socket

Welded

Piping Plan(Drawn to Scale)

PipingIsometric

Drawing Symbology:

Reference: Practice # 000.250.9817 Pg. 3

Gate Valves

Gate & Globe Valve Dimensions 150#(See practice # 000.250.9810 forcomplete chart and notesnotes)

Length Of Exposed Valve Stem

Rule Of The Thumb:

To find the distance from the top of the stem to the

handwheel is to use the valve nominal size

Example:

8 Gate Valve8

OpenPosition

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Socketweld & Screwed Valves

Isometric SymbolsGasket Mark Locations:

Handwheel Orientations and Callouts forIsometrics

Handwheels oriented onhorizontal or vertical

centerlines

(no callout required)

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Handwheel Orientations and Callouts forIsometrics (continued)

Offset handwheels with boltholes straddling naturalcenterlines shall requirecallout for handwheelorientation.

Offset handwheels with boltholes straddling naturalcenterlines shall requirecallout for handwheelorientation.

Handwheel Orientations and Callouts forIsometrics (continued)

Offset handwheels require boltholes to be rotated.

Callouts required for bothhandwheel and bolt holeorientation.

Exercise

Exercise PI-E8A

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The Globe Valve

Throttling Valve: Allows Flow

Variation

Note: Stem and handwheel

rise at the same time.

Globe Valves

Flanged

Buttwelded

Screwed and

Socket Welded

Piping Plan

(Drawn to Scale)

Piping

IsometricDrawing Symbology:

Reference: Practice # 000.250.9817 Pg. 4

Gate & Globe Valve Dimensions 150#(See practice # 000.250.9810 forcomplete chart and notesnotes)

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The Check Valve

Prevents Backflow

Note:Some check valves are limited in positions thatthey may be placed due to the internals.

Swing Check Valve

Wafer Check Valve

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Horizontal Lift Check

Installed in horizontalposition only.

Flow moves through thebody in a changing courseas in globe valves

Gravity and reverse flowclose it automatically

Check Valves

Flanged

Buttwelded

Screwed and

Socket Welded

Piping Plan(DRAWN TO SCALE)

PipingIsometric

Drawing Symbology:

Reference: Practice # 000.250.9817 Pg. 3

Check Valve Dimensions 150#(See practice # 000.250.9810 for complete chart and notesnotes)

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Exercise

Exercise PI-E8B

The Ball Valve

Block Valve: Either Opened or Closed

Ball Valves

Flanged

Buttwelded

Piping Plan

(Drawn to Scale)

Piping

IsometricDrawing Symbology:

Reference: Practice # 670.250.9817 Pg. 2

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Ball Valve Dimensions-150#(Review standard #000.250.9810 for complete chart and notesnotes)

The Butterfly Valve

Block Valve: Either Opened or Closed

Butterfly Valves

Flangeless

Piping Plan

(Drawn to Scale)

Piping

IsometricDrawing Symbology:

Reference: Practice # 000.250.9817 Pg. 1

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The Plug Valve

Block Valve: Either Opened or Closed

Plug Valves

Flanged

Buttwelded

Screwed and

Socket Welded

Piping Plan(Drawn to Scale)

PipingIsometricDrawing Symbology:

Reference: Practice # 000.250.9817 Pg. 4

Relief/Safety Valves

Pilot OperatedRelief Valve

Steam SafetyValve

Process PressureRelief Valve

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Safety Valves:Handles steam and gas and opens fully whenthe pressure exceeds the maximum pressurefor which the valve is set.

Relief Valves:

Handles water and oil and opens

proportionally with the increase ofpressure.

Relief/Safety Valves

Flanged

Screwed

Relief Valves

Flanged

Screwed MPTxFPT(w/pipe nipple)

Piping Plan(DRAWN TO SCALE)

PipingIsometric

Drawing Symbology:

Reference: Practice # 000.250.9817 Pg. 1

Screwed FPTxFPT(w/o pipe nipple)

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Example: Valving In Relief Systems

ReliefValve

GateValve

GateValve

BleedValve

Relief/Safety ValvesPhotos

Relief/Safety ValvesPhotos

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Relief/Safety ValvesPhotos

Control Valves

Typical Control Valve Manifold

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Valve Review

Valve Review

Valve Review

Exercise PI-E8C

Gear Operators

Bevel Gear Worm Gear

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Chain Operated Valves

Piping Plan

(drawn to scale)

Piping Isometric:

Side view

Top ViewTop View

Handwheel Extensions

Motor Operators

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Copyright 2007 Fluor Corporation

Valve Accessibility

Ideal Handwheel Heights

Maximum Handwheel Height

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Chain Operated Valve Height

Minimum

Bottom of HandwheelEL. 7-6

Approx.3-0

Valve Accessibility and Clearance:Vertical Stem

Valve Accessibility and Clearance:Horizontal Stem

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Questions??

Test PI-T8