If your pressure washer has several interchangeable nozzles to vary the output pressure, or a hand control to vary the pressure, it has the first type of valve. The second type cannot cope with adjustable output pressure.
I need to educate myself as to how your pressure washer is supposed to work, so we can distinguish between what it does correctly, and what it does incorrectly. Can you give me the exact model number please, so I can search on-line for a user manual?
