名词解释题Ball valve
名词解释题
Ball valve
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The globe valve has a bulbous body, housing a valve seat and screw down plug or disc arranged at right angles to the axis of the pipeAccording to the above sentence, which of the following statements is not true?A.The profile of the valve is like a globeB.The valve seat is set into the bulbous bodyC.The plug or disc of the valve is made vertical to the axis of the pipeD.The valve seat is located at right side of the plug or disc
The CO2 flooding system is actuated by a sequence of steps which are ______.A.break glass, pull valve, break glass, pull cylinder controlB.sound evacuation alarm, pull handleC.open bypass valve, break glass, pull handleD.open stop valve, open control valve, trip alarm
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To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the_______ .A.suction service valve as a vaporB.suction service valve as a liquidC.discharge service valve as a vaporD.charging valve as a liquid
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单选题Unlike the globe valve, gate valves give full bore flow without change of direction, such a valve is not suitable to partially open operationAccording to the above sentence, which of the following statements is not true?（）AThe globe valve may be suitable for partially open operationBThe globe valve will give full bore flow with change of directionCThe gate valve gives full bore flow with change of directionDThe gate valve is suitable for full bore operation only
单选题If the head pressure of a reciprocating refrigeration compressor is excessive, （）.Athe relief valve should open before the high pressure cutoutBthe relief valve should open and allow the excess refrigerant to flow to the receiverCthe high pressure cutout switch should operate before the relief valve opensDyou should close in on the suction valve
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单选题If the head pressure is too high,（）Athe relief valve should open before the high-pressure cutoutBthe relief valve should open and let excess refrigerant go to receiverCthe high-pressure cutout switch should operate before the relief valve opensDclose in on the suction valve
单选题Valve lash, or clearance refers to the （）Aclearance between the top of the valve stem and the rocker armBcompression of the valve springsCclearance between the valve seat inserts and the headDout of roundness of the fuel injection cams
单选题A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.Aevaporator pressure decreaseBevaporator coil over-feedCevaporator capacity increaseDexpansion valve diaphragm rupture
单选题To add refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through the （）Asuction service valve as a vaporBsuction service valve as a liquidCdischarge service valve as a vaporDcharging valve as a liquid
单选题To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the （）.Adischarge service valve as a vaporBsuction service valve as a liquidCcharging valve as a liquidDcondenser purge valve as a vapor
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）Aworn valve seatsBworn main bearingCexcessive valve clearanceDweak rocker arm springs
单选题In a refrigeration system, if the cooling water to the condenser fails, the（）.Abox temperature solenoid valve will closeBexpansion valve will closeCcompressor will shutdownDking valve will open
单选题The low pressure side of a refrigeration system is considered to exist from the （）.Aexpansion valve to the compressorBreceiver to the expansion coilCexpansion valve to the evaporatorDcondenser to the expansion valve
单选题Valve cages are used on some large diesel engines to （）Areduce wear on the valve stemBpermit the use of alloy valve seat materialsCreduce heat transfer from the valve seatDfacilitate valve removal for servicing
单选题The major difference between the discharge and suction valves installed in most low pressure, reciprocating air compressors is that（）Aone valve seats upwards, while the other seats downwardsBthe reed valves used on the discharge are made substantially thicker and heavier than the suction valvesCthe suction valve springs exert a greater tension than the discharge valve springsDthe discharge valve springs exert a greater tension than the suction valve springs
单选题A vessel conducting mine clearing operations will show（）.Athree balls in a vertical lineBtwo balls in a vertical lineCone ball near the foremast and one ball at each fore yardDone diamond near the foremast head and one ball at each fore yard
单选题The solenoid valve can be typed as a（）Athermal valveBmagnetic stop valveCbellows valveDbimetallic valve