QUESTION:
So no check valve with a PWM valve system?
ANSWER:
It is sometimes too much to ask a checkvalve to do the job of a Solenoid valve. Some PWM system needs a checkvalve if the nozzle is some way from the valve. it keeps the water inside the line, minimizing the delay on the next injection event.
The crack pressure of a checkvalve should be tailored to your application. Too high a cracking pressure will rob you of pressure seen at the nozzle tip. A weak valve will leak under partial vacuum, even on the non-vacuum side of the throttle plate. This is caused by force of gravity (tank is higher than the nozzle, parked on a slope etc.) or venturi effect in the inlet track.
A solenoid is normally good for holding up against a 100psi+ of pressure compared to a common checkvalve at ~20psi. When a solenoid opens, it does not drop as much pressure as the Checkvalve. Sometimes may be a few psi.
All in all, try avoid using it for major work or you may end up a engine full of water. The cost between the items is only a few dollars, why compromise.
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