Siemens dishwasher inlet valve - gentle trickle only, is it bad?

[hder]

Have an20 year old Siemens dishwasher that stopped spraying water - after a cycle, soap clumped at the bottom, no water on dishes.   Suspect the inlet valve.  Took it out, hooked to the water line over a bucket, energized the valve, and I get a gentle trickle.  I think it should be a strong stream, shouldn't it?  $200 part, but not sure it's the problem, since I do get water coming through, but doesn't seem to be much.  Can't seem to disassemble the solenoid/valve assembly to clean it - somewhat of an integrated design... Would like to know if this is the culprit or not... Your comments are appreciated!

[LearningTech]

Unhook the water supply and flow it into bucket directly.( without valve) is it also a trickle.

flow through valve should be at least 80% if not more than flow direct from line.

sounds like its bad to me. 

[LearningTech]

Double check its getting proper voltage though 

[hder]

The water supply, when directed into a bucket without the inlet valve shoots out like a garden hose - lots of volume and pressure.

Yes, getting 120VAC - I made a direct plug from wall outlet to solenoid of valve, measures 120VAC with a voltmeter. 

The gentle trickle from the valve must mean the valve is blocked, partially open, or something else...too bad I can't seem to be able to disassemble it... hmm..

Oh well...

[LearningTech]

Yep then get new. 

Even the ones that can disassemble seem to have trouble soon after, and i have seen people that do disassemble them never get them back 100% and it leads to leaks more Han 1/2 of the time