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1325 测试

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When the fluid pressure at the valve vena contracta falls below the fluid vapor pressure, and downstream pressure P2 is less than the fluid vapor pressure, what will occur?

a) cavitation

b) flashing

Flashing damage often has the same physical appearance as _____.

a) erosion

b) cavitation damage

c) galling

d) corrosion damage

Which one is right ?

a. WCC can be used between -29 Deg C to 538 Deg C

b. 440C can meet NACE requirement

c. Pitting can corrode the whole surface of the metal

d. Zn is used as sacrificed material in graphite packing assembly to protect other metal materials

Which product is with VCT trim selection?

a. EZ

b. Notchflo DST

c. DA

d. DST

The two types of the higher pressure/temperature ratings that are available with some Fisher™ control valves are:

a. Intermediate Standard and Intermediate Special

b. Low Pressure and Intermediate Pressure

c. Standard and Critical

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