The other check valve is behind the plywood(actually its half way through it). When vacuum is applied the tee check valve is open letting sap in from the mainline which connects to the step down side. At that time, the other check valve is sucked closed. When it releases to the tank, the tee check valve gets pushed shut and the other check valve gets pushed open by the out rushing sap. I'll try to get a closer pic if you're still not sure. Let me know. PS. The tank is on the backside of what you see.
Last edited by madmapler; 09-10-2013 at 07:08 PM.
2013-1st year...94 taps, 12x24 sugarhouse, home built evap. Gast 2065 pump with bender
2014-30x36 sugarhouse, 2.5x10 "Jutras" evaporator, 1200+ taps on vacuum, sap brothers RO. 2 sihi 2 stage pumps, 440 gal.
2015- 1000gph memtek RO, 3250 Taps, 1200 gallons
2016- Modified grimm 4'x12' evaporator with auf and aof with air preheater. Home built airtight arch front. 4250 taps?
2017- 2400gph. Lapierre RO, 10" filter press, 5000 taps