1.3 Flashcards
Are used to control flow of the water throughout the system.
Valves
Proper location of ______ simplifies repairs to the system, fixtures or equipment being serviced.
Also regulate flow to deliver the appropriate quantity of water and reducewater consumption.
valves
not used to regulate flow of water but it is used to shut off the flow of water such as to fixturesand equipment when must be made.
gate valves
usually used where the flow of the water is left either completely opened or closed for most of the time
gate valves
is a manual valve that has a wedge-shaped leaf that, when closed, seals tightly against metal seats that are set at slight angles
gate valves
is a manual, compression-type valve,commonly used where there is occasional or periodic use, such as lavatories (faucets) andhose connections (called hose bibbs
globe valves
Design of the _________ is such that the water passing through is forced to make two 90° turns, which greatly increases the friction loss in this valve compared with that in a gate valve
globe valve
is a manual valve similar in operation to the globe valve, utilizing the same principle of compressing a washer against a metal seat to cut the flow of water
It is commonly used for outside hose bibbs.
This has a much higher friction loss than the gate valve and about half the friction loss of the globe valve.
angle valves
opens to allow the flow of water in the direction desired and prevents flow in the other direction
There are two types of this valves, _________ and _________.In the ________ _______ valve design, the pressureof the water forces the valve gate to swingopen, but once the flow stops, gravity causesthe gate to fall closed, preventing a reversal ofthe flow
In contrast, the gate in a __________ isspring loaded. Water pressure forces the gateopen much like the swing type, but when theflow stops, a spring (not gravity) forces the gate closed.
check valves, swingtypes, spring types, swing check, spring check valve
is a manual valve that has a ball with a hole through it that is mounted between two seats
When the ball hole is in line with the valve openings, full flow of water occurs. A 90°rotation of the ball causes the valve to be fullyclosed.
These are available in both on/off shut offcontrol and controlled - flow designs.
ball valves
frequently called a tempering valve or mixing valve, is an automatic valve thermostatically blends hot and cold water o desired temperatures and to prevent scalding
thermostatic valves
are designed to automatically discharge for a specific length of time and thus deliver a fixed quantity of water before closing off flow. They operate by pushing down or against the valve handle to ensure that water is shut off after a short period of time.
metered valves
is a metered valve that discharges a predetermined quantity of water to fixtures for flushing purposes and is closed by direct water pressures
flushometer valves
automatically adjusts the rate of water flow to a predetermined flow rate as a pressure in the system varies. They can be used to limit flow in a fixture outlet thereby holding demand to a required minimum.
flow control valves
It is a safety valve designed to LIMIT PRESSURE of a liquid vapor or gas. These valves are specified such that the valve remains closed at a normal operating pressure. They are commonly found as a safety feature on water heaters and boilers
temperature - pressure relief valve
is an adjustable valve designed to reduce pressure to a specific setting. These valves are commonly used in buildingplumbing systems where street water pressure is excessiveand needs to be reduced before being sent to plumbingfixtures.
pressure reducing valve
is a valve designed to accept the threaded connection of a hose
horse bibb ( sill cock)
A _____________________ has a long body that when placed in an exterior wall, cuts off thewater supply near the interior wall surface. Thisallows water near the exterior wall surface to drain out when the valve is closed to avoid freezing of water and valve damage in severe winter temperatures
freezeless hose bibb
_______________________ require a specially designedknob to open the valve, which prevents use bythe general public.
Secured hose bibbs
The unit uses an infrared proximity sensor to detect a user approaching the fixture, then waits until the user departs. A __________ is used to actuate the flush.
sensor- operated valves. solenoid
FITTING AND VALVE SIZING
refers to the standard size of the pipe that the valve will fit into. It ensures that the valve matches the pipe’s size, allowing the correct amount of fluid to pass through without obstruction. This is usually based on the INTERNAL diameter of the pipe.
Normal Pipe Size (NPC)
FITTING AND VALVE SIZING
The measurement of the inside of the pipe or fitting. This is important because it determines the flow capacity and how much fluid can pass through
internal diamter
FITTING AND VALVE SIZING
the measurement of the outside of thepipe or fitting
outer diameter
