12-16

Question 1

-Flow is controlled by raising or lowering the valving element. Gate valves are not usually used to regulate flow because
the valving element can be damaged when in the partially open position.

Answer 1

GATE VALVES

Question 2

TYPES OF DISK

Answer 2

Solid taper wedge
Flexible wedge
Split wedge or Parallel disks Valve

Question 3

most common and widely used

Answer 3

SOLID TAPER WEDGE

Question 4

one-piece solid disk with a cut around the perimeter

Answer 4

FLEXIBLE WEDGE

Question 5

consists of two solid pieces and holds together with the help of a special
mechanism.

Answer 5

SPLIT WEDGE

Question 6

TYPES OF BODY BONNET JOINT

Answer 6

SCREWED
BOLTED
WELDED
PREASEURE-SEALED

Question 7

. Types of Stem movement

Answer 7

RISING STEM/ OS & Y TYPE
NON RISING STEM

Question 8

are a quick opening valves that give a tight shutof

Answer 8

BALL VALVES

Question 9

TYPES OF BALL VALVES

Answer 9

FLOATING BALL VALVE
Trunnion Mounted Ball Valve
3 WAY VALVE
TOP-ENTRY BALL VALVE
SPLIT-BODY BALL VALVE

Question 10

-consist of a disc attached to a shaft with bearings used to facilitate rotation. These are considered high recovery valves,
since only the disc obstructs the valve flow path

Answer 10

BUTTERFLY VALVES

Question 11

-has a comparatively tiny orifice at the end of a screw that suits the seat precisely, with a lengthy, tapered seat and a
needle-shaped plunger. Can also be used in vacuum systems at low pressure.

Answer 11

NEEDLE VALVE

Question 12

Types of Needle Valves

Answer 12

MOTORIZED NEEDLE VALVE
ANGLE NEEDLE VALVE

Question 13

don’t have a handle for manual operation, but instead use an electric or pneumatic actuator to connect to and
turn the plunger

Answer 13

MOTORIZED NEEDLE VALVE

Question 14

Turn the output from the inlet by 90 degrees instead of in-line

Answer 14

ANGLE NEEDLE VALVE

Question 15

-Used to prevent backflow, these valves are typically self- activated allowing the valve automatically opens when media
passes through the valve in the intended direction and close should flow reverse

Answer 15

CHECK VALVE

Question 16

ONE-WAY VALVE(CLOSED)

Answer 16

CHECH VALVE

Question 17

Types of Check Valves

Answer 17

SWING CHECK VALVE
TILTING DISC
BALL TYPE AND PLUG LIFT NRV
BUAL PLATE/ DUAL PLATE
STOP CHECK VALVE

Question 18

are bi-directional, on-off throttle valves. They are used to control fluid flow by regulating the area with which media can
enter and exit the valve, effectively changing its speed and velocity.

Answer 18

DIAPHRAGM VALVE

Question 19

TYPES OF DIAPHRAGM VALVE

Answer 19

WEIR TYPE
STRAIGHT THROUGH

Question 20

is the most popular type of diaphragm valve and it is best for general use applications or for tough corrosive and
abrasive services.

Answer 20

WEIR TYPE

Question 21

is the most popular type of diaphragm valve and it is best for general use applications or for tough corrosive and
abrasive services.

Answer 21

STRAIGHT THROUGH

Question 22

-Often used for handling solid materials, slurries and liquids with suspended solids, pinch valves use a linear motion.

Answer 22

PINCH VALVE