I tried doing this same thing run my ca reactor with my return I only used the 1/4 jg valve to controll flow. It did not work just no control either to fast or too slow flow I would assume the larger valve would help with that issue. By the way it sure looks like  a ball valve not gate. I run mine off a syphon now works good for me more control it still not perfect Peristaltic pump is idea but more money. 
		
	
		
		
		
		
		
	
		
		
	
	
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