Sliding Stem Control Valve

Question 1

A spring, or group of springs, enclosed in the yoke or actuator casing that moves the actuator stem in a direction opposite to that created by diaphragm pressure

Answer 1

Actuator Spring

Question 2

The part that connects the actuator to the valve stem and transmits motion (force) from the actuator to the valve

Answer 2

Actuator Stem

Question 3

A valve design in which one port is co-linear with the valve stem or actuator, and the other port is at a right angle to the valve stem

Answer 3

Angle Valve

Question 4

The portion of the valve that contains the packing box and stem seal and can guide the stem. It provides the principal opening to the body cavity for assembly of internal parts or it can be an integral part of the valve body. It can also provide for the attachment of the actuator to the valve body

Answer 4

Bonnet

Question 5

A device that supports and/or guides moving parts such as valve stems

Answer 5

Bushing

Question 6

A part of a valve trim that surrounds the closure member and can provide flow characterization and/or a seating surface. It also provides stability, guiding, balance, and alignment, and facilitates assembly of other parts of the valve trim

Answer 6

Cage

Question 7

The movable part of the valve that is positioned in the flow path to modify the rate of flow through the valve

Answer 7

Closure Member

Question 8

That portion of a closure member that aligns its movement in either a cage, seat ring, bonnet, bottom flange, or any two of these

Answer 8

Closure Member Guide

Question 9

The chamber of a piston actuator in which the piston moves

Answer 9

Cylinder

Question 10

A flexible, pressure responsive element that transmits force to the diaphragm plate and actuator stem.

Answer 10

Diaphragm

Question 11

A fluid powered device in which the fluid acts upon a flexible component, the diaphragm

Answer 11

Diaphragm Actuator

Question 12

A housing, consisting of top and bottom section, used for supporting a diaphragm and establishing one or two pressure chambers.

Answer 12

Diaphragm Case

Question 13

A plate concentric with the diaphragm for transmitting force to the actuator stem

Answer 13

Diaphragm Plate

Question 14

A diaphragm actuator in which the actuator stem extends with increasing diaphragm pressure

Answer 14

Direct Actuator

Question 15

A valve with a linear motion closure member, one or more ports, and a body distinguished by a globular shaped cavity around the port region

Answer 15

Globe Valve

Question 16

The part of the bonnet assembly used to seal against leakage around the closure member stem

Answer 16

Packing Box

Question 17

A movable pressure responsive element that transmits force to the piston actuator stem

Answer 17

Piston

Question 18

A fluid powered device in which the fluid acts upon a movable piston to provide motion to the actuator stem

Answer 18

Piston Type Actuator

Question 19

A term frequently used to refer to the closure member

Answer 19

Plug

Question 20

The flow control orifice of a control valve

Answer 20

Port

Question 21

A diaphragm actuator in which the actuator stem retracts with increasing diaphragm pressure

Answer 21

Reverse Actuator

Question 22

The area of contact between the closure member and its mating surface that establishes valve shut-off

Answer 22

Seat

Question 23

A part of the valve body assembly that provides a seating surface for the closure member and can provide part of the flow control orifice

Answer 23

Seat Ring

Question 24

A fitting, usually threaded on the actuator stem or into the yoke, to adjust the spring compression

Answer 24

Spring Adjustor

Question 25

A plate to hold the spring in position and to provide a flat surface for the spring adjustor to contact

Answer 25

Spring Seat

Question 26

The device that connects the actuator stem to the valve stem

Answer 26

Stem Connector

Question 27

The structure that rigidly connects the actuator power unit to the valve.

Answer 27

Yoke