Test 2 Flashcards
A plug valve is an example of a _____valve.
Rotary
T/F The disk shape of the plug valve is cylindrical or tapered shaped.
True
Plug valves operate _____ compared to gate valves.
Faster
Name two industries that use plug valves.
High Pressure Fracturing & Food Processing
Plug valves used in corrosive chemical application have a body lining of ______.
PTFE polytetrafluoroethylene also known as Teflon
Identify the following parts of a plug valve in the illustration A
Handle
Identify the following parts of a plug valve in the illustration B
Packing
Identify the following parts of a plug valve in the illustration C
Stem
Identify the following parts of a plug valve in the illustration D
Body
Identify the following parts of a plug valve in the illustration E
Plug
Identify the following parts of a plug valve in the illustration F
Plug Port
Name the six port patterns that the plug valve is available in.
Round opening, Rectangular Opening, Standard Opening, Diamond Opening, Multi-Port and Venturi design
When the plug’s opening is turned perpendicular to the flow stream, the valve is in the _____ position.
closed
With plug valves larger than 3 inch, what type of actuator is used instead of a handwheel?
Geared hand wheels Actuator
Name the four types of plug valves
Lubricated, Non-lubricated, Eccentric and Expanding
T/F Both lubricated and non-lubricated plug valves can provide a bubble tight shutoff.
True
What function does the check valve perform in association with the injection fitting?
prevents the sealant from flowing in the reverse direction once the sealant is injected into the cavity.
T/F The lubricant used in a lubricated plug valve must be compatible with the fluid in the pipeline.
True
T/F Non-lubricated plug valves are used in high temperature applications.
False
This type of non-lubricated plug valve has the body and plug fully lined with Teflon and are used with corrosive fluids.
Fully Lined
Name the type of plug valve
Eccentric Plug Valve
This type of plug valve provides a true double block and bleed function in one valve.
Expanding Plug Valve
Provide two advantages of plug valves:
Simple design and fewer parts. Provides a reliable leak-tight service.
Provide two disadvantages of plug valves:
Actuators are required for larger valves and the pressure drop is more due to reducing port
What is the P&ID symbol for the plug valve?
A butterfly valve is an example of a _____valve.
Rotary
A butterfly valve is an example of a _____valve.
parallel
T/F Butterfly valves work well in low pressure drop applications.
True
A zero offset butterfly valve is known as ______.
concentric
Offset in a butterfly valve means that the valve stem is displaced from the _____ of the disc.
Center
Name the three types of eccentric butterfly valves.
Single, double or triple offset
Double and triple offset butterfly valves are also called _____ performance butterfly valves.
High
What are the two offsets in a double offset butterfly valve?
The shaft is offset from the centerline of the disc seat and body seal (offset one), and the centerline of the bore (offset two).
What are the three offsets in a triple offset butterfly valve?
The shaft is offset from its body center line & shaft offset from pipe center line & conical offset shape in its seal and discs connection
Name the type of butterfly valve based on the top view A
Stem
Name the type of butterfly valve based on the top view B
Body
Name the components of the butterfly valve C
Flange
Name the components of the butterfly valve D
Lining
Name the components of the butterfly valve E
Bushing
Name the components of the butterfly valve F
Steam sealing
Name the components of the butterfly valve G
Pins
Name the components of the butterfly valve H
Disc
Name the type of butterfly valve based on the top
Concentric
Name the type of butterfly valve based on the top
Double-Offset
Name the two common end connections for a butterfly valve.
Lug and wafer
Name two advantages of butterfly valves.
Easy to install and Low-pressure drop
Name two disadvantages of butterfly valves.
Possibility of Cavitation and choked flow as well as Poor Sealing function
T/F The P&ID symbols for a butterfly valve are:
True
A gate valve is an example of a _____valve.
linear
T/F The disk shape of the gate valve is a flat circular or rectangular plate.
True
Name the three major components of a gate valve.
Body, bonnet, and trim
How is the bonnet typically joined to the body of a gate valve.
By means of flanged, screws or welded connections
For an underground gate valve, what is attached to the valve to provide direct access?
Extension spindle
Name the two general types of gate valves.
Parallel and Wedge
This type of gate valve has a flat disc plate between two parallel seats.
Parallel Gate Valves
What is the purpose of the springs between the two discs in the conventional parallel gate valves?
Keep the upstream and downstream seats in sliding contact with the body and to improve the seating load at low fluid pressures.
Identify the type of gate valve
Through-Conduit Gate Valve
Name two applications where this valve is used.
Transportation of crude oil and gas as dirty river water with suspended solids or water with sludge or debris
This type of gate valve is used in systems with a high concentration of suspended solids such as slurries and sewage sludge.
Knife Gate Valve
What is the advantage of using a stainless-steel knife gate valve in wastewater applications.
Less vulnerable to corrosion damage
T/F Knife gate valves work well in throttling applications.
False
How do wedge gate valves differ from parallel gate valves.
The closure member is wedge-shaped instead of parallel.
T/F The wedge gate valve has a closure member that provides a high supplemental seating load that seals against high fluid pressures.
True
Name the three types of wedge gate valves.
Solid Taper, Split Wedge, and Flexible Wedge
Label the wedge gate valve.
Solid
Label the wedge gate valve.
Split
Label the wedge gate valve.
Flexible
This type of wedge gate valve has grooves in which wedge assembly travels and provides flexibility allowing it to seal more easily.
Split
This type of wedge is a one-piece disc with a cut around the perimeter which improves seat alignment and offers better tightness. A disadvantage is that process fluid tend to collect in between the seats.
Flexible
Name the two types of valve stem designs.
Rising Stem and Non-Rising Stem Gate Valve
A rising stem gate valve requires _____ space when opened compared to the non-rising stem.
more
T/F Rising stem gate valves are suitable for below ground installations.
False
In operating a non-rising stem gate valve, the stem ______ come out of the housing.
does not
T/F Non-rising stem gate valves are suitable for both above ground and below ground installations.
True
T/F In non-rising stem gate valves, it is not easy to determine if the gate valve is fully open or fully closed.
True
What is the difference in the valve body between a metal seated gate valve and a resilient seated gate valve.
Metal seated gate valve has a depression in the valve body bottom and resilient seated gate valve has a plain valve bottom
What material does a resilient seated gate valve use to allow the gate surface to resume its original shape after sealing.
A high quality rubber compound
Gate valves are designed for ______ operation.
isolation
Gate valves have ____ pressure drop across them.
low
Define water hammering.
A surge of pressure or high-pressure wave that occurs when a fluid in motion is forced to suddenly stop or change direction
Name two conditions that happen when a gate valve is partially open.
Vibration and noise
Which of the following P&ID symbols is a gate valve?
B
A ball valve is an example of a _____valve.
rotary
T/F The disk shape of the bass valve is spherical shaped.
True
T/F Ball valves can have multiple ports.
true
Name the two most common metal materials that ball valves are manufactured from
Steel and Brass
Label the following parts of the ball valve A
Bonnet
Label the following parts of the ball valve B
Stem
Label the following parts of the ball valve C
Ball (Full Bore)
Label the following parts of the ball valve D
Body
Label the following parts of the ball valve E
Flanged End
Label the following parts of the ball valve F
Ball Seat
The pinch valve shown is an example of an _______ pinch valve.
open
Label the parts of the pinch valve A
Stem
Label the parts of the pinch valve B
Pinching Device
Label the parts of the pinch valve C
Valve Body (Sleeve)
The P&ID symbol for a pinch valve is _______.
D
For the diaphragm valve body shown, the weir is part _____.
a. Port
b. Weir
c. Flow Passage
. The P&ID symbol for a diaphragm valve is _____.
A
Name the parts of the needle valve 1
Valve handle
Name the parts of the needle valve 2
Nut
Name the parts of the needle valve 3
Bonnet
Name the parts of the needle valve 4
Valve Body
Name the parts of the needle valve 5
Seat
Name the parts of the needle valve 6
O-Ring
Name the parts of the needle valve 7
Packing
Name the parts of the needle valve 8
stem
Name the parts of the needle valve 9
Handle Screw
T/F The P&ID symbol for a needle valve is
True
Identify the type of globe valve body type shown
Z Type
Identify the globe valve disk type
Plug Disc
Identify the globe valve disk type
Composition Disc
Identify the globe valve disk type
Ball Disc
Identify the standard cage
Equal Percentage
Identify the standard cage
Linear
Identify the standard cage
Quick-Opening
For the graph below, identify the type of cage: a, b, c
a. Quick-Opening
b. Linear
c. Equal-Percentage
The P&ID symbol for a globe valve is ____.
C
