Control Valves Flashcards by jack wrobel

Q

A

Single Ported Globe Valve

Needs larger actuator

Seals easier

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Double Ported Globe Valve

Smaller Actuator (more equalized pressure)

Harder to seal (due to thermal

expansion of parts)

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Gate Valve

On / Off

Not good at fine control

little energy loss when open

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Diaphragm Valve

for slurries (biphase products with solids)

slurries can damage other kinds of valves

poor fine control

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Port Guided Globe Valve

stem can be smaller due to reduced

pressure on stem

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Unbalanced Cage Guided Globe Valve

more force required due to difference in pressures

less leaks

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Balanced Cage Guided Globe Valve

less force required by stem due to balanced nature

more leaks

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Unbalanced Cage Guided Globe Valve Leaks

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Balanced Cage Guided Globe Valve Leaks

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

3 way Globe Valve

for converging or diverging service

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Rotary Stem Ball Valve

full bore ball valves have no restriction

when fully open

poor flow control (causes too much turbulence)

characterized or segmented versions have good

shutoff and much better flow control

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Rotary Stem Butterfly Valve

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Rotary Stem Disk Valve

hard to close completely

eccentric disk valve (variation) shuts

completely (called high performance butterfly valve)

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Ball Valve Example

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Segmented or Characterized

Ball Valve Example

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

A

Disk Valve Example

Q

A

Damper / Louvre Example

large flows of air at low pressure

like venetian blinds

Q

A

Radial Vane Damper

Q

A

Pneumatic Damper

Q

A

Valve Packing Sliding Stem

Q

A

Valve Packing Valve Stem

Q

A

Live Loaded Valve Stem Packing

Q

A

Valve Packing Example

Q

A

Stem Packing Lubricator

Q

A

Valve Packing Bellows Seal

Q

A

Bellows Seal Unit Example

Q

A

Pneumatic Actuator

Q

A

Rack and Pinion Pneumatic Actuator

Q

A

Direct Acting Valve Bodies

Q

A

Reverse Acting Valve Bodies

Q

A

Available Failure Modes