Valve Seat之中文名称为气门头.
Valve Seat之中文名称为气门头.
相关考题：
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
Springs in fuel injectors will become not strong enough to work because______.A.the injector opens at a lower pressure than designedB.the needle valve and seat wear outC.the nozzle holes wear outD.long time in use
单选题Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）ALube oil passing through the systemBMoisture or foreign matter collecting at the valve seat and orificeCVariable spring tension caused by the changing temperatureDFrost on the liquid line
单选题Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）Aerosion and cratering of the nozzle orificesBfuel leakage into the nozzle drain lineCfuel leakage before and after injectionDinsufficient fuel delivery though that nozzle
单选题Moisture in the refrigerant may （）.Afreeze on the expansion valve seat and reduce the flow of liquid refrigerantBemulsify the oil in the condenserCfreeze in the king valveDclog the oil trap
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If one of the bilge system manifold valves does not properly seat, the （）Abilge well connected to that valve, plus the second bilge well being pumped will be completely emptiedBbilge system will lose vacuum and prevent the other bilges from being pumped outCbilge well aft connected to that valve will siphon its contents to the forward bilge wellsDdischarge pressure will be too high
单选题In a refrigeration system, which of the following statements describes the actions occurring when a solenoid valves, used in conjunction with an unloader head is energized?（）AThe solenoid valves directs high pressure gas to the valve lifting device raising the suction valve off its seat and causing one specific cylinder to become unloadedBThe solenoid valves directs high pressure gas to the underside of the unloading piston, causing it to rise and allowing the recirculating ports to be openedCWhen the solenoid valve becomes energized, the valve ports become closed, allowing discharge pressure to build up above the piston, shifting it and causing it to unloadDThe solenoid valve allows the refrigerant to pass from the suction chamber to the top of the unloader piston, causing the piston to lift and unload the cylinder
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During the dock repair, each sea valve must be disassembled, cleaned and ground well.Before it reassemble the sealing surface between the valve and the valve seat should be checked by （）Achief engineerBsurveyorCthe engineerDthe technique personnel of the shipyard