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70 Cards in this Set
- Front
- Back
What is a check valve used for? |
To prevent backflow or reversal of fluid in the pipe |
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Which valve is beat suited for fluid throttling? |
Globe Valves |
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3 main categories of check valves. From below which is not a category of check valves? |
Swing Check Sliding Check Lift Check Non - slam check |
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What is the name of the valve that is somewhat similar to the gate valve except has a disc rotates in the bore of the body? |
A butterfly valve |
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What kind of flow is required when incorporating the use of a swing check valve? |
High velocity flow to maintain the disc in full open position |
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A ball valve only requires a _________ degree turn of the handle to fully open or close to the valve? |
90° |
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What does WSP mean on a valve? What does WSP mean on a valve? |
Working Steam Pressure |
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What can a slight open gate valve cause? |
High Velocity flow through the valve |
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A butterfly valve creates |
Low restriction in flow |
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The Y pattern globe valve is installed where there is a possibility of ________ being deposited into the line upstream of the valve? |
Sediment |
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A one piece ball ball is? |
Not serviceable |
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What is an actuator |
A device that is connected to the valve bonnet/stem that allows the valve to be remotely activated |
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Which valve has a pilot gas connection built into the body? |
Firing valve |
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According to the ILM's which globe valve has slightly less restriction than the straight globe? |
Angle globe valve |
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Which check valve was recently added in our industry? |
Non-slam check valve |
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Which check valve can be installed in both horizontal and vertical positions? |
A swing check |
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Gate valves are not designed for throttling? |
True False |
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Globe and check valves have what type of seat? |
Downstream side |
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What type of valve is installed on a straight run of pipe where pressure lose must be kept to a minimum or where there is a possibility of sediment being deposited in the line upstream of the valve? |
Y pattern |
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1/4 to 1/2 psi |
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According to the ILM's which of the following is not a main design and flow pattern of a glove valve? |
Y pattern Offset pattern Angle pattern Straight pattern |
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Which style of valve incorporates a replacement disk and seat? |
A globe valve |
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What Does WOG mean |
Water Oil Gas pressure |
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Valves used as curb cocks are typically made of what material? |
Bronze |
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What type of material is the "ball" on the ball valve made of? |
Carbon steel or Stainless steel |
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What type of material is a gas valve typically made of? |
Brass |
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What type of valves are best suited for non- throttled laminar flow? |
Gate and Ball valves |
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How many change of directions on fully open globe valve? |
4 90° turns |
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What location should a check valve be installed st the end of a water service pipe and what material is it? |
Cold water line, on plastic pipe |
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What type of removal device should be incorporated upstream of a pressure reducing valve? |
A strainer |
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Which type of valve can be operated in either normally open or closed position? |
Solenoid Valve |
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Pressure reducing valve |
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What is the movable plate inside a butterfly valve body that controls the flow the the valve? |
A valve disc |
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What is special about pet cocks? |
One end is threaded and the other end is for a hose |
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What is an advantage of a butterfly valve? |
It can be installed in areas with limited head room |
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A vertical lift check |
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A pressure reducing valve will reduce pressure in a piping system. What other function does it have? |
Regulates pressure |
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What style of valve is a gas cock? |
A plug valve |
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What style of valve is best used for fine throttling? |
Needle valve |
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What style of valve is best suited for 90°bends |
An angle pattern globe valve |
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Diaphragm Valve |
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A lift check valve is typically installed in what position? |
Upright on horizontal piping |
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What position must a ball valve be installed |
Ball valves are permitted to be installed in any position |
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What is a common result of damage to a valve seat when the valve is permitted to leak ever so slightly over a long period of time? |
Wire Draw |
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What is commen result of damage to the valve seat when a disc has deteriorated to a point where there is metal on metal contact? |
Galling |
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Needle valve |
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When a spring check valve is packaged and shipped how does it come. |
The normally closed position |
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What are two variations in stem operation used on valves? |
Rising and non rising |
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What type of valve is used when hot tapping into water mains? |
A corporation stop |
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Which is the most common design of a valve bonnet used on applications where valve servicing is frequent? |
Bolted bonnet |
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8 types of valves |
Plug, gate, globe, ball, butterfly, check, diaphragm, relief |
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10 kinds of end connections used on valves |
Threaded, welded, flanged, compression, flared, solder, hub, union, bolted, clip |
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SS? |
Stainless steel |
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PSIG? |
Pounds per square inch |
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SP? |
Steam pressure |
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MI? |
Malleable Iron |
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4 types of gate valves |
Solid wedge disc, flexible wedge disc, split wedge disc, and double disc |
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3 types of globe valves |
Straight pattern, angle pattern and y pattern |
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What is the plug type globe valve ideal for? |
Very minute throttling because of the wide surface of the contact on the disc and seat is likely to erode or cause wire drawing |
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What does the spherical ball of the ball valve seats made of? |
Teflon |
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Where should a square headed steam cock valve not be used? |
Should not be used on gas piping systems |
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What's good about the diaphragm design? |
The design provides easy maintenance and repair as the valves can be replaced without disturbing the piping line |
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What type of valve? |
Swing Check |
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What type of valve? |
Globe Y pattern |
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What type is the top valve? |
Angle globe valve |
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What type of valve? |
Globe straight or Lift Check horizontal |
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What type of valve? |
Ball valve |
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3 types of bonnet valves? |
Screwed in bonnet, screwed union bonnet, bolted bonnets |
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What is the knife gate valve good for? |
The gate has a sharp edge on the bottom to shear entrained solids or to separate slurries |
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What is the rising stem used with? |
OS&Y (outside screw and yoke) |