Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
8 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Plug valves/cocks Quarter turn valves |
Pros: Simple design, quick open close, leak tight shut off, used to regulate the flow of liquids containing solids and slurries. Cons: 4” and over require power actuators, cost more then ball valves. |
|
|
|
Gate valves Fully open or fully closed |
Pros: minimize pressure drop across the valve when fully opened. Stop flow completely when fully closed. Most designs allow **** off in both directions. Can be used on lines with slurries, heavy oils, varnish, molasses. |
Con: can’t be throttled, slow opening and slow closing, require a lot of room for install and operation. Not for use on systems that shock loading may happen, acceptable to thermal or pressure binding. Glob |
|
|
Globe valves Meant for throttling. ( fluid nearly makes four 90deg turns to get through. |
Pro: good shut off, good throttling properties, require fewer turns to shut or open, available in “Y” and angle configuration. Cons: Higher pressure drop compared to valves with straight threw patternes. |
|
|
|
Main types of disc design for gate valves. |
Solid wedge disc Flexible wedge disc Spilt wedge disc Double disc. |
|
|
Front (Term) |
Parts of gate valve. |
|
|
|
Three main designs and flows of a globe valve. |
Straight pattern Angle pattern Y pattern |
|
|
|
Best valve for throttling. :A Best globe valve for throttling: B |
A= globe valve B= Needle valve for very fine throttling. |
|
|
|
Types of check valves. |
1:lift check 2:swing check 3:non-slam checks. |
|
