-3- The stroking spring range of a valve is the same on the bench as it is in service with the pumps running or steam pressure present. True False -4- The stored force in the spring of some control valves can be as high as 1800 pounds, setting the potential for injury or death if disassembled incorrectly. True False -5- It is best to remove the stem from the packing box to completely clean the stem and packing box before installing the new packing rings. True False -6- Two valves the same pipe size will not have the same flow capability if their CV factors are different. True False -7- There is no difference between three-way diverting valves and three-way mixing valves. True False -8- Normally open valves are usually installed on heat exchangers serving domestic hot water. True False -9- The system differential pressure of the water or steam tends to widen the in service stroking spring range compared to the bench stroking spring range of a valve. True False -10- A valve installed backward in a system may cause a hammering noise as it attempts to modulate. True False -11- A pilot positioner on a valve eliminates the effect of system differential pressure on the valve`s stroking range. True False -12- When the hot water supply temperature is hotter than required by the served area with the greatest heating requirement, the seats and discs on the system’s valves tend to experience more wear and tear, shorting the valves’ life span. True False Automatic Dampers -1- The normal position of a damper is the position it reaches with no air pressure on the actuator. True False -2- Most often the fresh air and exhaust air dampers are normally open and the return air damper is normally closed. True False -3- There is never danger of injury from an actuator`s spring when replacing a diaphragm. True False 1.3
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