L2.1_WATER SUPPLY FITTINGS Flashcards
Consists of Fitting provided with projecting rims or flanges which are screwed
over the two pipe ends to be joined.
FLANGES
TYPES OF FLANGES
- Slip flange
- Screw flange
Consists of a wedge-shaped plug which is screwed down to sea t between two
brass rings surrounding the inlet pipe so that a double seal is obtained
Gate valves
are operated by screwing down a disk with soft packing until it presses tightly
upon a metal seat. Same end must always be
used as inlet.
Globe valve
are used when it is desired that the flow through a pipe be always in one
direction and there is a possibility of a flow taking place in the opposite direction
Check valve
has a pivoted flap which is readily pushed open by the pressure of water from
one side but is tightly closed by the force of a reverse flow
Swing Check Valve
Consist of a loose disk which closes by gravity when the pressures on both sides
are equal
Lift Check Valve
changes the direction of the flow of water as well as control it. Acts somewhat
like globe valve but are usually used for a right angle turn
Angle Valve
operate by means of a round, tapering plug, perforated in one direction
perpendicular to its axis and ground to fit a metal seat. The faucet it open when
the perforation is in line with the pipe and is quickly closed by turning the plug so
that the perforation is across the line of flow
Key Cock
operate by the compression of soft packing upon a meta seat. They close
against the flow of water and can be used upon high pressure pipes without
causing water hammer
Compression Cock
similar to a compression cock but has a screw outside for connection of water hose.
Hose Bibb
Arranged to discharge water while they are held open by the hand and to close
by a spring inside the faucet as soon as the pressure of the hand is removed.
Self-closing faucet
