Faucets and Flushometers 060301i Flashcards
The body and working components of most quality residential faucets are predominantly manufactured from what?
Yellow brass
What’s another name that describes a 2 handle faucet?
Standard
What do standard (2 handle) faucets and single-lever faucets rely upon to maintain a set temperature and pressure at the outlet of the faucet?
Water pressure
Frost free hose bibs requiring cross-connection protection must be provided with what?
A self draining hose end vacuum breaker
Which faucets usually require the most maintenance?
Washer-style or compression faucets
Washer style faucets or compression faucets work on the principle of holding a seal or bibb washer over the opening to the faucet by means of what?
A screwed spindle or stem
Bibb washers or faucet washers in most faucets are made of what?
Neoprene composite material
What is the most common cause of water dripping from the spout of a compression style faucet?
Worn or hardened bibb washer
When a faucet drips for a long time due to a worn or hardened bibb washer what other problem can occur?
Water moving between the washer and the seat causes wire drawing of the brass seat
What is the only option when repairing a ceramic disk?
Must replace the whole thing
Shower valves must be set to not exceed what temperature?
120°F (49°C)
What are the 3 traditional types of flush valves?
Piston, diaphragm and metering
What fixture requires the use of only a metering style of flush valve?
Urinal
Most urinal flush valves require a minimum operating pressure of ___ psi and operate at a maximum of ___ psi
15, 80
What size flush valve outlet is required for a urinal?
3/4”
Metering valves typically require a minimum of ___ “ water supply piping while diaphragm and piston valves require a minimum ___” water supply
1/2, 3/4
What is the minimum supply for a water closet flush valve?
1”
What is the minimum outlet for a water closet flush valve?
11/2”
What is the primary defence against cross connection in a flush valve?
Vacuum breaker
A piston style flush valve that fails to close off after flushing would be an indication of what?
The pistons main seat has become damaged
A faucet leaking from the handle is most likely caused by what?
Worn O-ring
A piston flush valve on the most downstream water closet in a bank of toilets that doesn’t receive sufficient volume to flush solids would be an indication of what?
Urinal piston parts are installed accidentally
Water line is undersized
In a diaphragm flushometer, what creates the seal between the upper and lower chambers as the flush cycle ends?
More force being exerted in the upper chamber due to a large area of diaphragm exposed to pressure holds the diaphragm in a closed position until pressure is relieved by the trip lever initiating the flush cycle
What happens when you open the set screw on the top of a piston style flush valve?
Longer flush
The o-rings on the top of a washerless cartridge prevent water from following where?
From the handle
A diaphragm flush valve that fails to have a long enough flush will most likely be caused by what?
Bypass orifice is damaged and enlarged
The length of flush for a urinal should be how long?
3-5 seconds
What will happen to the length of flush of a piston flush valve should the adjustment screw be turned counter clockwise?
The length of flush will increase
In an electronic flush valve if the length of flush is too short what action should be taken?
Replace the sensor module
A diaphragm flush valve that creates a chattering sounds during flush would be an indication of what?
Diaphragm material damaged allowing high velocity water into the upper chamber
A diaphragm flush valve that has an excessively long flush would be an indication of what?
Bypass is restricted not allowing the diaphragm to reset in proper time
Which flushometer cannot be installed on a water closet?
Metering
A continuously running pump should not be used on a high rise apartment complex for what reason?
It will overpressure the system during low demand periods
What part of a flush valve prevents cross connection?
Atmospheric vacuum breaker
What happens when you turn in the regulating screw on a diaphragm flush valve?
The flush will grow longer
