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crookback    
n. 驼背

驼背

crookback
adj 1: characteristic of or suffering from kyphosis, an
abnormality of the vertebral column [synonym: {crookback},
{crookbacked}, {humped}, {humpbacked}, {hunchbacked},
{gibbous}, {kyphotic}]
n 1: a person whose back is hunched because of abnormal
curvature of the upper spine [synonym: {humpback}, {hunchback},
{crookback}]


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  • Backflow prevention device - Wikipedia
    Backflow means the undesirable reversal of flow of a liquid, gas, or suspended solid into the potable water supply; a backflow preventer is designed to keep this from happening Points at which a potable water system connects with a non-potable water system are called cross connections Such connections occur naturally in appliances such as clothes washers and dishwashers, but they must be
  • Atmospheric vacuum breaker - Wikipedia
    Diagram of Atmospheric Vacuum Breaker in both working states An Atmospheric Vacuum Breaker (AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water system It is usually constructed of brass and resembles a 90-degree elbow with a hood on its top to allow air to enter the water system if a siphon attempts to form
  • Backwater valve - Wikipedia
    A backwater valve is a backflow prevention device used to prevent outbound water through a dwelling's drain pipes from re-entering -- "back flowing"—into a home The valve contains a flap that allows water to exit the home, but closes to prevent the back flow into the home [1]Backwater valves commonly activate when a city's sewer lines are unable to handle a large amount of falling
  • Double check valve - Wikipedia
    Double check valve during normal operation Double check valve during reverse flow A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the
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  • Backflow - Wikipedia
    Backflow occurs for one of two reasons, either back pressure or back siphonage [1]Back pressure is the result of a higher pressure in the system than in its supply, i e the system pressure has been increased by some means This may occur in unvented heating systems, where thermal expansion increases the pressure Back siphonage is the result of supply pressure being lowered below that of
  • Pressure vacuum breaker - Wikipedia
    A pressure vacuum breaker (PVB) [1] is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply A PVB is similar to an atmospheric vacuum breaker (AVB), except that the PVB contains a spring-loaded poppet This makes it acceptable for applications that are high hazard or where valves are downstream
  • Ball valve - Wikipedia
    A ball valve is a flow control device which uses a hollow, perforated, and pivoting ball to control fluid flowing through it It is open when the hole through the middle of the ball is in line with the flow inlet and closed when it is pivoted 90 degrees by the valve handle, blocking the flow [1] The handle lies flat in alignment with the flow when open, and is perpendicular to it when closed
  • Vacuum breaker - Wikipedia
    A vacuum breaker is a device that prevents water from being siphoned backward in a direction it is not desired to go They are commonly placed on a bibcock valve or toilet or urinal flush valve, in which application they can prevent hose or drainage water from back-siphoning into the public drinking water system This prevents contamination should the public drinking water system's pressure drop
  • Piping and plumbing fitting - Wikipedia
    Copper fittings for soldered joints Pipe fittings: 1) Copper (solder); 2) Iron or brass (threaded); 3) Brass (compression); 4) Brass (compression to solder); 5) Brass adapters PVC fittings A fitting or adapter is used in pipe systems to connect sections of pipe (designated by nominal size, with greater tolerances of variance) or tube (designated by actual size, with lower tolerance for





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