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  • Model 167 MGM Wafer Back Pressure Valves

Application Overview

MGM Model 167 Back Pressure Check Valves are designed to allow flow in one direction only. The check mechanism is held in the closed position by a spring. This stops flow in the reverse direction. They are made completely of carbon steel and/or stainless steel not castings, for added durability.

When pressure from flow in the permitted direction overcomes the force of the spring, the check mechanism opens. When this flow stops or reverses, the check closes. The metal to metal seal allows slight leakage after closure. These valves are recommended for use in all inflowing lines. They may be used in any position. The MGM Model 167 Back Pressure Check Valves are designed for installation in lines that flow into pressure tanks. They should be in inflowing lines when outward flow is never required.

NOTE: Do not reduce outlet pipe size. Back Pressure Check Valves should be installed as close as possible to the container, with the stem pointed inwardly toward the container.



  • Body Carbon Steel
  • Poppet Stainless Steel
  • Guide Carbon Steel
  • Spring Stainless Steel



  • Designed to slip inside Schedule 80 or less steel pipe.
  • Fits inside the bolts of 150 or 300 pound American Standard steel pipe flanges. Valves may also be furnished for Ring Type joints.
  • Generous flow channels provide low pressure drops.
  • Heavy duty all steel construction will withstand extremely tough conditions.
  • Complete 304 or 316 stainless steel construction available for use in corrosive or extreme environments.
  • UNDERWRITERS LABORATORIES INC. listed for propane, butane, and anhydrous ammonia.
  • CRN # OC13500.5C
  • Other valve sizes may be available. Contact Hemco for alternate sizes.



Sizes and Dimensions 

Series Dimensions
A-Close B C D E
1.72 2.88 .5 1.13 1.44
2.19 3.63 .5 1.5 1.9
2.63 5.0 .5 2.0 2.88
3.28 6.19 .63 2.5 3.75
5.13 8.5 .75 4.0 5.63
5.31 10.63 .75 4.25 7.5
7.06 12.75 .88 5.75 9.5

All Size Values are in Inches.