I have ward floor furnace I remplace the gas valve and the thermocuple pilot is on but
Turning the burning on what can be the problem

Many items.
The gas valve? Is it the correct valve for the unit? Are you sure?
Did you wire the valve correctly? Did you dubble check?
Did you turn the new gas valve lever to the on position? Believe it or not I have seen that happen before. Is the thermostat turned all the way up causing the thermostat to call for heat?

What was the original problem?

What is the EXACT model number of the unit?

I have ward floor furnace model#570 edr
I remplace the gas valve also the thermocuple
The pilot is on but is not turning I remplace the thermocuple Two times it work only 4or 6timesso I don't kow what to do

Yes the valve is new I got the valve from a apliances place so thast what igot

The exact model# is 570 edr

The exact model# is 570 edr
BTU per hr 57000
BTU per hr 39900

You got the model # already

My furnace model # is 570 edr
But is not turning on new gas valve and new thermocuple only my pilot is on

I have looked through all my old books hoping to find your furnace and a diagram. No luck here. Sorry.

Is it possible for you to take pictures and post them here of the valve and wiring?

I also need a new valve for the Ward furnace - where can I buy one?
Thanks
Hermann