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501 Excess Flow Check Valve
501 Excess Flow Check Valve
501 Excess Flow Check Valve Cross Section
Picture of Model 501

Model 501 Excess Flow Check Valves


  • Designed for welded installation into pipe, ranging from schedule 10 to 160 based on customer requirements.
  • Generous flow channels provide minimal pressure drops.
  • Heavy duty steel construction will withstand temperatures from -50ᴼ F (-45ᴼ C) to +300ᴼ F (+148ᴼ C) and internal pressures up to 2,400 psig (165 barg).
  • Complete stainless steel construction available for greater range of operating temperatures.
Canadian Registration Number: OC13500.5C
Series Pipe Size A B Flow Rating
501:E 0.75 16.81 4.81 Click Here
501:F 1 17.17 5.13 Click Here
501:H 1.5 18.31 6.31 Click Here
501:I 2 18.56 6.56 Click Here
501:K 3 18.63 6.56 Click Here
All Size Values are in Inches.
  Carbon Steel 316 Stainless
Body Low-temp Carbon 316-SS
Guide Low-temp Carbon 316-SS
Spring --- 316-SS or 302-SS ---
Poppet(incl. nut and cotter pin) --- 316--SS ---

*Alternative materials available at additional cost

MGM Model 501 Excess Flow Check Valves are designed to be welded directly into the line. At each end of the valve is pipe, which is provided for a variety of welded installation options. They are made completely of carbon and stainless steel.

Model 501 MGM Excess Flow Check Valves can be installed in any orientation with negligible effect on flow rate. Each valve ships stenciled with the proper closing flow direction on the body. Model 501 is equipped with an orifice in the check mechanism to allow for pressure equalization and will reopen automatically.