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22 Cards in this Set
- Front
- Back
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The kind of valve that has minimum wire drawing and seat erosion is the A. Ball valve B. Globe valve C. Check valve D. Gate valve |
B. Globe valve |
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What is the maximum temperature for which a non special alloy steel valve can be used? A. 343°C B. 425°C C. 925°C D. 650°C |
D. 650°C |
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Type of valve suitable as stop valve, where conditions require either full flow or no flow. A. Gate valve B. Globe valve C. Needle valve D. Check valve |
A. Gate valve |
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Valve ideal for throttling or regulating flow with a minimum of wire drawing and seat erosion A. Gate valve B. Globe valve C. Needle valve D. Check valve |
B. Globe valve |
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Valve designed to allow precise flow control A. Gate valve B. Globe valve C. Needle valve D. Check valve |
C. Needle valve |
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Valve prevents reversal of flow in piping A. Gate valve B. Globe valve C. Needle valve D. Check valve |
D. Check valve |
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Two types of valves commonly used on the steam outlet of a boiler. Of the two which is more likely to be used? |
Gate valve most used Globe valve |
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Name the two basic types of check valves. |
Swing Lift |
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As a minimum, the markings on all piping fittings must be legible and indicate the following: A. B. C. |
A. Manufacturers name B. Service designation. Pressure and temperature C. Material designation. |
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Non-return stop valve |
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A valve that often contains a dashpot to cushion the action of the valve is the: A) Needle valve B) Swing check valve C) Lift check valve D) Safety valve E) Pressure regulating valve
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C) Lift check valve |
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The advantage of a rising spindle steam stop valve is that: 1. You can tell from a distance if the valve is open or closed 2. It provides a place to install isolation tags 3. It may be easily lubricated 4. The threaded part is not exposed to corrosion by the high temperature steam A) 1, 2, 4 B) 2, 3, 4 C) 3, 4 D) 1, 2, 3 E) 1, 3, 4 |
E) 1, 3, 4 |
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Increasing the spring tension of a pressure regulating valve will: A) Decrease the regulated pressure downstream of the valve B) Close the valve tight C) Increase the regulated pressure downstream of the valve D) Reduce or minimize the cycling or “hunting” of the valve E) Cause the valve to go to the wide, open position
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C) Increase the regulated pressure downstream of the valve |
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Valve packing, depending on service, may be made from: 1. Teflon 2. Manila 3. Impregnated asbestos 4. Halon 5. Semi-metallic material A) 1, 2, 3 B) 2, 3, 4 C) 1, 3, 5 D) 1, 2, 5 E) 3, 4, 5
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C) 1, 3, 5 |
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In order to insure safe and continuous operation of a pressure, reducing valve, the valve station should have: A) A “Y” strainer immediately after the valve B) A metal rather than composite diaphragm C) A safety valve on the downstream side D) A bypass loop, downstream safety valve and downstream pressure gauge E) The piping should be at least Schedule 80 |
D) A bypass loop, downstream safety valve and downstream pressure gauge |
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A valve which requires specific and routine lubrication is the: A) Globe valve B) Butterfly valve C) Tapered plug valve D) Pressure reducing valve E) Check valve |
C) Tapered plug valve |
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Regular inspection of a valve is important and items which require close scrutiny are the: A) Steam and body B) Seat and stem C) Hand wheel and packing D) Stuffing box and spindle threads E) Disc and seat
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E) Disc and seat |
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A valve that has the greatest capability of handling slurries and fluids with high suspended solids is the: A) Plug valve B) Gate valve C) Ball valve D) Needle valve E) Globe valve
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C) Ball valve |
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“Valve trim” consists of the following parts: 1. Stuffing box 2. Disc 3. Seat ring 4. Bonnet 5. Valve stem 6. Body 7. Guide bushings A) 2, 3, 5, 7 B) 2, 3, 4, 5 C) 1, 2, 6, 7 D) 3, 4, 5, 6 E) 1, 2, 4, 6
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A) 2, 3, 5, 7 |
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The bypass around a regulating valve should contain a: A) Lift type check valve B) Rising stem gate valve C) Rising stem globe valve D) Swing check valve E) Non-rising stem gate valve |
C) Rising stem globe valve |
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Relative to valves, a frequent cause of serious accidents is due to: A) A lack of valve maintenance B) Inadequate operational training C) Wrong materials of construction D) Manufacturing defects E) Valves being of the wrong size |
C) Wrong materials of construction |
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Butterfly valves have several advantages such as they: 1. Only require ¼ turn to open or close 2. Are self cleaning 3. Provide negligible pressure drop when fully open 4. Can have the disc lubricated while in operation 5. Are self adjusting so alignment is not required during installation A) 3, 4, 5 B) 1, 3 C) 2, 4 D) 1, 2, 5 E) 1, 2, 3 |
E) 1, 2, 3 |
