King-Gage, A NOSHOK Company’s COVID-19 Response

Downpipe Check Valve

Downpipe Check ValveDownpipe Check Valve

6363 Downpipe float check valve, 3/4” NPT connections
6563-10 Downpipe float check valve, 3/4” NPT outlet, 3/8” tube inlet


  • Prevents siphoning or backflow of liquid through a downpipe installed in tank level gauging applications
  • Utilizes a specially designed float pin that rises up to seal the valve shut when liquid enters from the downpipe through the bottom of the unit
  • The advantage of a float check is that it doesn’t create a pressure drop that would affect the level gauge reading (Spring-loaded check valves can impact the accuracy of a downpipe or bubbler system if installed at the tank entry point)

NOTE: Not recommended for use with heavy diesel fuel oil or other high viscosity liquids. Installation in conjunction with a gate valve will permit removal of check valve for inspection and cleaning. (We recommend cleaning the check valve once per year to ensure reliability.)

Material: 304 Stainless Steel, Nylon (float), FKM (seals)
Max. Pressure: 150 psig
Inlet/Outlet: 3/4" NPT-female
Weight: 1.2 lb (0.5 kg) 


Download 6563 Downpipe Check Valve Data Sheet_1200-30