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86 Cards in this Set
- Front
- Back
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List the five general categories of residential and commercial faucets. |
Standard or two handle Single lever Frost free or hydrants Metering Electronic faucet |
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Quality faucets are predominantly manufactured from what? |
Yellow brass. |
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What are some of the materials used to make various cartridge components? |
Stainless steel Plastic Nylon Ceramic Teflon |
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Any variation in line pressure to either hot or cold supply will result in what in a single handle faucet? |
Fluctuations in temperature and pressure from the faucet. |
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Single handle tub or shower applications allow for the addition of a balancing mechanism which will? |
Limit fluctuations in temperature at the faucet outlet. |
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What three requirements do frost free faucets, hose bibs or hydrants have? |
The shut off portion (valve stem and seat) is located in a warm environment The barrel of the valve is installed so water can drain out after use Require a self draining hose end vacuum breaker |
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Where are metering faucets most commonly used? |
Commercial hand washing and showering applications |
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What are the four styles of faucets? |
Washer Washerless Ball Cartridge |
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What are the installation requirements of single handle tub/shower installation? |
Must be anchored to the framework around the tub/shower. Valve body must be placed in a manner that permits finished wall with completed finishing material. |
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Name the components of this washer style faucet cartridge.
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A) stem assembly or cartridge B) spline C) stem D) bonnet seal E) Bibb washer F) brass seat |
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The Bibb washer or faucet washer is a neoprene composite material. What are the manufactured configurations? |
Beveled Flat |
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Use caution when tightening a Bibb washer to the retaining cup. What may happen if it is over tightened? |
If the washer fits tight to the retaining cup prior to tightening, the retaining cup may split or expand upon tightening or when the bib washer is compressed during usage. The expansion of the retaining cup will cause damage to the stem or internal damage to the faucet. |
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How do you determine if the seat in a faucet is removable? |
A round opening indicates that the seating area is a vast portion of the valve body and is not replaceable. The hexagonal or square opening permits the seat to be removed and reinstalled by using properly shaped and sized seat removal tool. |
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What would be the most common cause of ceramic disk failure? |
Debris in the cartridge and supply water. Sand can cut grooves into the disk face. The entire cartridge must be replaced. |
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What are the four flush valve types? |
Piston Diaphragm Metering Electronically controlled solenoid |
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What type of flush valve? |
Piston |
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Name the type of flush valve. |
Diaphragm |
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What is this? |
Metering flush valve |
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What the **** is that? |
Electronically controlled solenoid flush valve. |
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What is the minimum and maximum water pressures required by most flush valves to operate? |
Minimum 100kPa Maximum 550kPa |
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If a set of taps is leaking from under the handle, what is the most likely cause of this condition? |
Worn O-rings Damage to seat and seat spring on washerless assembly Packing shrinkage Gasket or O-ring failure |
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What can be a common cause for reduced water flow from a faucet? |
Failed or fouled flow restrictor Mineral or calcium buildup or debris in aerator. |
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What is a safe practice for removing a Bibb washer? |
Place the stem in the faucet handle to protect your hand from the screw driver. |
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What does NPC 2.2.10.7 refer to? |
Shower valves. All shower valves must be the pressure balance or thermostatic mixing type and the outlet must not exceed 49C |
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What type of flush valve? |
Piston |
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Name the type of flush valve. |
Diaphragm |
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What is this? |
Metering flush valve |
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What the **** is that? |
Electronically controlled solenoid flush valve. |
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What is a flush valve? |
A metering device that permits a predetermined volume of water to be delivered during each operating cycle. |
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What is the minimum and maximum operating pressure of most flush valves? Which type is the exception? |
Minimum 100 kPa Maximum 550 kPa
Exception, the metering flush valve, follow manufactured specs. |
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Describe the operation of the piston flush valve. |
Piston flush valves are divided into upper and lower chambers with equal water pressure in both chambers when the valve is in the closed position. Slight handle movement pushes a plunger and allows water to escape the upper chamber. The water in the lower chamber is now greater and it raises the piston from where it was seated, allowing water to flow through the valve outlet to the fixture. While the valve is operating a small amount of water flows through a bypass filling the upper chamber. As the chamber fills the piston is returned to its seat. |
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Describe the operation of a diaphragm flush valve. |
Divided into two chambers. Upper chamber holds the water that keeps the diaphragm closed until the handle is tripper to start the flushing process. Depress the handle a relief valve is opened allowing water to the upper chamber to stop the process. |
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What is the minimum supply piping size for all flush valves serving a WC? |
1" |
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What minimum size of supply piping is required for metering flush valves? Diaphragm and piston flush valves? |
Metering 1/2" Diaphragm and piston 3/4" |
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What is a form of back flow prevention used in newer flush valves? |
Flush valve shut off with internal spring check. |
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Which style of faucet requires the most maintenance? |
Washer style faucet. |
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Which type of faucet is generally used for residential lawn service? |
Frost free |
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Which type of faucet is least likely to be used in a residential application? |
Electronic (self-test answer key) Metering (IMHO) |
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Which two styles of faucets use seals held in place with the aid of a spring to prevent water leakage through the faucet? |
Washer-less faucet Ball style faucet |
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What must be done prior to working on any faucet? |
Turn off the water to both hot and cold supplies |
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What is the advantage of using a plastic nut and washer rather than a steel nut and washer for fastening a two-handle faucet to the fixture? |
If the faucet should leak around the stem, a plastic nut and washer will not deteriorate as a metal nut and washer would. |
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What is attached to a shower valve to aid in correct positioning of the valve? |
A plaster guard |
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What is attached to a shower valve to aid in correct positioning of the valve? |
A plaster guard |
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In what two configurations are Bibb washers manufactured? |
Beveled Flat |
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What does the Bibb washer close against in most washer style faucets? |
Brass seat |
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What does the Bibb washer close against in most washer style faucets? |
Brass seat |
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Why is it important that the Bibb washer fit into the retaining cup on the faucet stem? |
The retaining cup may split or expand upon tightening or when the Bibb washer is compressed during usage, causing damage to the stem or internal damage to the faucet. |
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How can you tell if the brass seat in a washer style faucet is replaceable? |
If the brass seat has a square or hexagonal opening it can be replaced. |
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What causes the wire drawing of a brass seat? |
Water moving in a fine spray between the Bibb washer and brass seat for a long period of time. |
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What is used to direct water flow from the kitchen faucet to the vegetable spray? |
Diverter |
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Pliers should not be used on which types of faucet surfaces? |
Chrome finishes or special surfaces. |
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Pliers should not be used on which types of faucet surfaces? |
Chrome finishes or special surfaces. |
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The NPC stipulates that shower valves must be restricted to what maximum flow temperature? |
49C (120F) NPC 2.2.10.7 |
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NPC 2.6.1.1(1) states |
Every fixture supplied with separate hot and cold water controls shall have the hot water on the left and the cold on he right. |
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NPC 2.6.1.1(1) states |
Every fixture supplied with separate hot and cold water controls shall have the hot water on the left and the cold on he right. |
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What three traditional types of flush valves used in urinals and water closets? |
Piston Diaphragm Metering |
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NPC 2.6.1.1(1) states |
Every fixture supplied with separate hot and cold water controls shall have the hot water on the left and the cold on he right. |
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What three traditional types of flush valves used in urinals and water closets? |
Piston Diaphragm Metering |
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What is the minimum size of supply line required for metering flush valves on urinals? |
1/2" |
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NPC 2.6.1.1(1) states |
Every fixture supplied with separate hot and cold water controls shall have the hot water on the left and the cold on he right. |
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What three traditional types of flush valves used in urinals and water closets? |
Piston Diaphragm Metering |
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What is the minimum size of supply line required for metering flush valves on urinals? |
1/2" |
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What is the minimum supply line required for diaphragm flush valves used in urinals? |
3/4" What is the minimum |
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What is the minimum supply line for piston flush valves used in water closets? |
1" |
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What is the minimum size supply line required for piston flush valves used in water closets? |
1" |
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What is the minimum water supply pressure for piston or diaphragm flush valves for urinals or water closets? |
100kPa (15 PSI) |
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NPC 2.6.3.3 states: |
Where the static pressure at any fixture may exceed 550kPa (80 PSI), a pressure-reducing valve shall be installed to limit the maximum static pressure at the fixture to 550kPa |
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What size of outlet tube is required from a flush valve for connection to a urinal? |
3/4" |
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What size of outlet tube is required from a flush valve for connection to a water closet? |
11/2" |
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What is used to signify the flush volumes of various diaphragms and piston assemblies? |
Colour coding. |
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What is the most likely cause if a diaphragm flush valve flushes too long or fails to shut off? |
The bypass hole in the diaphragm is dirty or plugged Line pressure too low Wrong diaphragm installed Relief valve not seated properly |
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What is most likely cause if a piston flush valve flushed too long or fails to shut off? |
Piston not seating Line pressure not sufficient Wrong piston installed Main seat has fouled. |
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Electronic flush valves are powered by what source? |
Batteries 24V |
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NPC Article 2.4.10.3(1) states: |
Except as provided in Sentence (2), the hydraulic load from a fixture that produces flow, such as a pump or an air-conditioning fixture, is 31.7 fixture units for each litre per second of flow. |
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NPC Article 2.4.10.3(2) states: |
Where a fixture or equipment that produces a continuous or semi-continuous flow drains to a combined sewer or to a storm sewer, the hydraulic load from the fixture is 900L for each litre per second of flow. |
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NPC Article 2.4.10.5 states: |
Except as provided in sentence 2.4.10.3(2), where the hydraulic load is to be expressed in literary, fixture units shall be converted as follows: a) when the number of fixture units is 260 or fewer, the load is 2360L, and b) when the number of fixture units exceeds 260, the load is 9.1L for each fixture unit. |
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NPC Article 2.4.8.1 states: |
Minimum Slope Except as provided in articles 2.4.10.8 and 2.4.10.9, every drainage that has a size of 3" or less shall have a downward slope in the direction of flow of at least 1 in 50. |
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Name the major vents in the plumbing system. |
Vent header Vent stack Stack vent |
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What table are dual vents sized from? |
Dual vents are sized from table 2.5.7.1 |
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What table are dual vents sized from? |
Dual vents are sized from table 2.5.7.1 |
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Name the vents that must be full size throughout their entire lengths. |
Stack vents Vent stacks Continuous vents Relief vents |
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What vents must be increased as the load increases? |
Vent headers Branch vents |
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What are continuous vents an extension of? |
A branch or fixture drain. |
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Which NPC Article is used when sizing sump vents? |
Article 2.5.7.7 |
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According to the ABC, what minimum fixtures are required for a dwelling? |
Water closet, tub/shower, lavatory and kitchen sink. All dwelling must have a supply of hot water. |
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What is the recommended measurement of flood level rim of a kitchen sink from the finished floor? |
36" |
