The blowdown on a safety valve is adjusted by turning the:
a. Inspector's seal
b. Valve disc
c. Adjusting nut
d. Adjusting ring
e. Valve seat
Answer: D
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Power Engineering Chapter 59
- If a boiler has more than 500ft of water heating surface and power input more than 1100 kw how many relief valves are required?
- How many relief valves a boiler should have?
- Which code provides recommendations for the testing, operation and maintenance of safety valves?
- Temperature relief device opens when water temperature rises to about
- Which one is NOT a cause for a relief valve in a heating boiler that is opening or spilling?
- Who can repair a safety valve?
- When should the pop test be performed?
- The try lever test should not be used on low pressure boilers unless pressure is at least
- The main advantage of the torsion bar safety valve is
- Torsion bar safety valve is designed for use on boilers operating at?
- Superheater safety valves has a exposed spring because?
- Cast-iron safety valve is are not used on what?
- Cast-iron safety valve is suitable for pressures up to?
- The safety valve popping pressure may be increased or decreased by a maximum of?
- A wire seal on a safety valve is installed by
- Which code states that "Pressure relief valves shall be designed and constructed without chattering"
- The difference between the pressure at which the valve opens and closes is called?
- The pop chamber is provided with what that allows steam to escape from under the skirt?
- Another name for the pop chamber is?
- Another name for the lip on a safety valve is?
- The pop valve is provided with ___ which becomes filled with steam when the valve starts to open.
- If the safety valve is open and there is no pressure in the boiler, what will happen?
- When the safety valve has been set by the adjusting nut a ___ is put in place.
- The adjusting nut on a safety valve is prevented from shifting after adjustment by?
- The valve disc on a safety valve is held firmly on its seat by the pressure of the?