Control Valve 2

Identify Rotary Valve type

• Ball

• Globe

• Eccentric Plug (Rotary Globe)

• Butterfly

What type of valve normally used for high capacity condition ?

• Globe

• Ball

• 3 way

• Angle

What is reverse acting actuator ?

• Increasing air pressure moves the stem actuator in downward direction

• Increasing air pressure moves the stem actuator in upward direction

what are disadvantages of Globe valve - single port

• high unbalanced forces on the plug requiring large actuators

• Difficult for maintenance

• Low pressure recovery characteristics

• High leakage rate

What condition do we use 3-way type of valve ?

• Mixing

• viscous

• diverting

• slurries

Identify the valve type?

• Angle valve

• Split body valve

• Saunders valve

• 3 way valve

What are application for angle valve ?

• Erosive and flashing service

• high differential pressure prevails condition

• Self draining Design

• hydrocarbon where coke may form

find the statement related to butterfly valve.

• creates a very high unbalanced forces, set up by large differential pressure as the disc rotates

• Leakage through the valve is <1% of maximum rating

• operating torque required to close or open is low

• high capacity than globe valve

Ball valve is rotated 90 degrees from its closed position to its fully open position by a drive shaft, coupled to a piston or a diaphragm actuator.

• True

• False

what type of valve produces an equal-percentage flow characteristic. These control valves have good range ability, control, and shutoff capability ?

• 3 way valve

• V-notch ball valve

• Angle valve

• butterfly valve