Still pulsed. (Otherwise you would need different types of servos depending on whether you were connecting them to a proportional or a switched channel)

If you want to get simple on-off operation of the valves you bought, then the simplest way might be to add in a cheapie servo that drives a microswitch that allows your RX battery voltage to be switched to the valve .

By then tho, you have a "solution" that is more expensive than the Jettronic valve, but is providing less functionality... or to get proportional behaviour you could have a servo drive a pot instead of a microswitch

Or if you are comfortable enough with electronics you could throw together a converter to take the incoming signal and generate a proportional 0 -> 5v level out of it... there may even be a commercial product out there that does this for you.

Sometimes it's just easier to pay someone for the product they already have Maybe less fun though.

Gordon