Tpc 347 Flashcards
(25 cards)
When are stainless steel valves used?
Where service requirements, including pressure, temperature, and shock or vibration, exceed what bronze or cast iron valves can handle
Threaded joints are often used to….
Connect the valve to the pipe where the valve is removed frequently
A common problem with gate valves is leakage around the stuffing box when the valves is partially open. To stop this leakage, you must adjust or replace the packing. To adjust the packing you must…
Turn the gland bolt nuts in a clockwise direction.
A stem may not move freely if the stem threads are…
Damaged
What is usually the first indication of a valve problem?
A leak
In a diaphragm valve the first part to wear out is usually?
The diaphragm
Pop safety valves open fully when…
A preset level of static pressure is met
Pop safety valves have pressure ratings ranged from ______ and temperature limits of _______
3 to 250 psi
450 degrees Fahrenheit
Chatter make occur if there is low __________ at high ________ which pops the valve open
Volume
Pressure
What part of the safety relief valve contains the pressure which opens the the relief valve?
Huddling chamber
A valve actuator is used to?
Open or close a valve
Most diaphragm actuators are air-operated, typical air pressure range from….. and at max is…..
3 to 15 or 6 to 30 psi and 125 psi max
A bourdon tube gauge is used to measure?
Fluid pressure
A turbine flow meter indicates flow rate by producing an?
Electrical signal
Accumulators are used to?
Store pressure
Gate valves are most often used for?
Fully open or fully closed types of applications
Globe valves are best suited for?
Flow regulating use
Steel valves made entirely of steel are used in what kind of applications
High pressure and high temperature
The marking WOG on a valve indicates that the valve is suitable for handling…
Cold water, oil, and gas
Flanged joints require the use of?
Gaskets
Leakage is one of the most common signs of… in steam lines.
Insulation failure
The tracer lines should be self draining, so that the condensate will…
Flow to a collection header
What is a disadvantage of electric tracers?
The require constant monitoring
The simplest way to protect an exposed water line from freezing is to?
Drain the piping system
