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19 Cards in this Set
- Front
- Back
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PRV stands for ? (2) |
Pressure relief valve Pressure reducing valve |
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How does a pressure reducing valve work? |
Through pressure exerted by the spring pressing on the diaphragm |
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List 2 applications for pressure reducing valves in a plumbing system: |
1) excessive pressure in the water line 2) excessive pressure from a down feed system in a high rise system |
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Why must a strainer be installed on the main or high pressure side of a PRV? |
To prevent dirt from being lodged between PRV and seat and disc |
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Explain the term “ reduced flow pressure “: |
The pressure maintained by valve when water is flowing |
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Explain the term “ series, relative to PRV installation “: |
Two or more valves installed inline. |
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Explain the term “ parallel, relative to PRV installation”: |
Two or more valves installed to serve the needs of one large supply main. |
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Why might a series installation be necessary? |
To allow for pressure reduction capacity greater to that provided by a single drive. |
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Why might a parallel installation of pressure reducing valves be necessary? |
Two allow the use of 2 smaller , less expensive valves rather than one large, expensive valve. |
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Why might one PRV in parallel be set at a higher opening pressure than the other PRV? |
To prevent both valves from opening during low demand periods . |
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The most common type of pump is the _________ pump |
Centrifugal |
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Booster pumps are used to ________ and to supply adequate _______ and _______. |
Lift water Water Pressure |
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Buster pumps come in what range of sizes? |
1/4 HP to 200HP |
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In a combination upfeed/downfeed system , where will the take off for the cold water upfeed portion be located? |
Upstream of the pump |
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What valve is required when lower floors are supplied by a down feed system? |
Pressure reducing valve |
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Is a check valve necessary on a booster pump system? |
Yes |
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On a combination upfeed/downfeed system, the lower floors are supplied by _______ |
Main pressure |
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A constantly running pump requires a ____________. |
Pressure relief valve |
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What must be taken into consideration when mounting a pump to the floor? |
Noise and vibration transmitted through the building. |
