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I use a ultrasonic bath. Does not require scrubbing but rinse with jet water after. Clean down to the pore:) Using laser on larger surface areas can take longer to clean and may not produce desired results.

Yes you can use a pressure tank provided it MUST be protected by means of having Vacuum Safety Valve or Breather Valve.

Use Orbit valve that comes with actuator. Fast action shut-off and designed for your purpose. Never use globe valve for emergency (steam) shut off service. Regards[bigglasses]

Been in a similar situation but with a 40 bar pressure inline. Just remove the gear box. Regards

I forgot to mention that we have similar problem with our pilot rv which is running on LNG. If we test it with water, the only thing is how to clear the water after testing at internal chamber of the pilot? Previously we test it using air/gas. Thank you

@Duwe6 Can you expalin further ->"They behave a LOT differently. I'll bet that the mfr will not guarantee setpoints established using air on one of his liquid, incompressible flow, PRV's"