Valves

Front 1

The part of the valve that contains the trim, located above the body.

Back 1

Bonnet

Front 2

The main part of the valve. It contains the disc, seat, and valve ports. It is directly connected to the pipe by threaded, welded, flanged, ect ends.

Back 2

Body

Front 3

A clicking sound from the valve cause by vibration.

Back 3

Chatter

Front 4

The moving part of the valve that directly affects the flow through the valve.

Back 4

Disc

Front 5

A Valve that does not restrict flow

Back 5

Full port

Front 6

A valve design to be fully open or fully closed not for throttling flow.

Back 6

Gate valve

Front 7

A valve used for adjusting or throttling flow.

Back 7

Globe valve

Front 8

The internal opening for the flow through a valve.

Back 8

Port

Front 9

The non-moving part of the valve on which the disc rests to form a seal and close off the valve.

Back 9

Seat

Front 10

The part of the valve that connects the disc to the valve operator or handle.

Back 10

Stem

Front 11

Reducing or controlling the fluid flow in a pipe system.

Back 11

Throttling

Front 12

The internal parts of a valve that receive the most wear and which can be replaced.

Back 12

Trim

Front 13

True or false

A gate valve in the open position has a low resistance to flow and the pressure drop across the valve is minimal.

Back 13

True

Front 14

The knife gate valve is similar to a regular gate valve but used in systems that carry what kinds of fluids?

Back 14

thick liquid such as slurries.

Front 15

What kind of stems do most knife gate valves have?

Back 15

OS and Y or outside screw and yoke.

Front 16

True or false

A ball valve is an eighth turn valve

Back 16

False, quarter turn valve

Front 17

True or false

Plug valves require a minimum amount of space to install.

Back 17

True

Front 18

Where are non lubricated plug valves typically used?

Back 18

Services were lubrication is inconvenient or the temperatures exceed lubricated plug limits.

Front 19

Name three valves are used to regulate flow in a piping system.

Back 19

Globe, angle, Y type, needle, butterfly, diaphragm, and control.

Front 20

True or false

Three way valves allow for flow in two directions from the source when in the ON position .

Back 20

False, three way valves direct the flow between two lines and block the flow to the third.

Front 21

What are the major parts of the globe valve? (4)

Back 21

Body, bonnet, disc, and stem.

Front 22

What are the most common bonnets on globe valves?

Back 22

Screwed in, bolted and union.

Front 23

What are the three types of discs in a globe valve?

Back 23

Conventional disc, composition disc and the plug type disc.

Front 24

This type of disc in a globe valve has a short taper on it's seating face and has a high seating pressure. This enables the disc to crush hard deposits that may form on the seat.

Back 24

Conventional disc

Front 25

This disc consists of three parts, a metal disc holder, a disc, & a retaining nut. discs are available in different materials.

Back 25

Composition disc

Front 26

This disk can withstand more damage from dirt, scale, and slurries than the conventional disc.

Back 26

Plug disc

Front 27

This type of globe valve allows a 90 degree turn in direction of flow.

Back 27

angle valve

Front 28

This valve provides the straight through flow of a gate valve and the throttling ability of a globe valve.

Back 28

Y type valve

Front 29

This valve gives fine control of flow in small pipe sizes.

Back 29

Needle valve

Front 30

True or false

When installing a butterfly valve direction of flow does not mater.

Back 30

False, if installed improperly they will not seal properly and leak.

Front 31

What are three types of butterfly valves?

Back 31

Wafer, wafer lug and two flange

Front 32

When installing a wafer type butterfly valve the valve should be in what position before tightening the flanges? (open or closed)

Back 32

open, to avoid damaging the seat.

Front 33

On this type of valve the valve body is the seat.

Back 33

Diaphragm valve

Front 34

What type of material are diaphragm valves good for?

Back 34

corrosive materials and slurries

Front 35

The diaphragm valve comes in what to body designs?

Back 35

The weird type and the straight away type.

Front 36

What type of valve is used in lines which may contain suspended matter, slurries and solid powder flows such as lime or cement.

Back 36

Pinch valve

Front 37

Where should pop safety valves be located?

Back 37

Directly on the vessel or tank they are protecting.

Front 38

Check valves are used for what purpose?

Back 38

Prevent backflow of liquids in a piping system.

Front 39

The three main parts of a valve are what?

Back 39

Body, bonnet and stem.

Front 40

Name three ways the body of a valve can be joined to the pipe.

Back 40

Threaded, soldered, flanged, butt weld, socket weld, glued.

Front 41

What are four of the most common bonnet assemblies?

Back 41

Threaded, Union, bolted, and pressure seal.

Front 42

What are the three basic types of stems available for valves?

Back 42

Rising stem, non-rising stem, outside screw and yolk (or OS & Y).

Front 43

When a _________ __________ valve is opening, the stem and the hand will rise.

Back 43

Rising stem

Front 44

__________ __________ valves the stem and handle do not rise when the valve is opened.

Back 44

Non-rising stem.

Front 45

on the __________ _________ valve the stem rises up through the hand wheel when the hand wheel is turned.

Back 45

OS & Y stem.

Front 46

Which style of stem is suitable for corrosive fluids?

Back 46

OS & Y stem because it does not come in contact with the fluid in the line.

Front 47

When metric units are required pressure is given in bar units, 1 bar equals ______ psi.

Back 47

14.5 psi.

Front 48

What type of valves are marked with the melt numbers or melt identification symbols?

Back 48

Cast valves

Front 49

When does stem disc or seat material need to be identified?

Back 49

When it is a different material than the body of the valve.

Front 50

Valve material designation MI indicates the valve is made out of what material?

Back 50

Malleable iron

Front 51

Valve material designation AI indicates what type of material?

Back 51

All iron

Front 52

The rating designation WSP refers to what?

Back 52

Working steam pressure

Front 53

What is the difference between an OWG valve and a WOG valve?

Back 53

OWG is better for oil but will work with water or gas as well, WOG is better suited for water but will also work for oil or gas.

Front 54

Valve size designation is given in ________.

Back 54

Nominal pipe size (NPS)

Front 55

True or false

Direction of flow is not important when installing check valves.

Back 55

False

Front 56

What is considered optimal height for installing valves?

Back 56

3' 6" to 4' 6"

Front 57

There is eight basic valve designs available, name four.

Back 57

Gate, globe, check, diaphragm, ball, butterfly, plug, relief.

Front 58

What would happen if you used a gate valve for throttling.

Back 58

A gate valve used for throttling will cause turbulent flow and will damage the valve parts.

Front 59

What are the four styles of gate valves? (discs)

Back 59

Solid wedge, flexible wedge, split wedge, double disc.

Front 60

What type of valves are used in situations where high pressure and/or high temperatures are encountered in large size pipe?

Back 60

A bypass valve.