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Excess Flow Check Valves are normally open valves. They are to be positioned in the tank line or tank fitting so that high velocity of flow outward from the tank will force the valves to the closed position. Each valve design is rated for one particular maximum rate of flow. It will allow the passage of any rate of flow less than, and up to and including, this maximum flow rate. With an increase of velocity of flow, the valve will remain closed as long as this differential prevails. *It is evident that, if the valve is properly installed and the piping and fittings are properly sized for the installation, the valve automatically will close in case of breakage of the line or any fitting in the flow system on the side of the valve away from the tank unless the pressure in the tank is too low to maintain valve-closing velocity through the broken line. When repairs to the system are made and pressure closed in, the slight seepage through the small orifice in the excess flow check valve head will, in time, allow pressures to equalize on both sides of the excess flow check valve and the excess flow check valve again will open to flow position and will be ready for further use. Flow lines should be as short and as free from bends and other flow restrictions as possible. Lines and fittings should not be reduced to smaller size than the size of the line for which the valve is intended as indicated by the last size code letter in the valve number.

UNDERWRITERS' LABORATORIES, INC. approvals are granted on the basis of a particular spring and a particular setting of the spring in addition to design and tolerance allowances. Whenever a spring setting or spring design is changed, this abrogates Underwriters' Laboratories approval.

Nos. 40 AND 41 SERIES MGM EXCESS FLOW CHECK VALVES are made entirely of steel and stainless steel. bodies are machined from solid bar stock, not joined in sections. Valve stem, valve head, spring, and cotter pin are made of stainless steel. Guide, nut, and body are made of carbon steel. Body is cadmium plated. Valves made entirely of stainless steel, monel, or other materials can be furnished.

No. 40 MGM EXCESS FLOW CHECK VALVE has male pipe thread on top end and female pipe thread in lower end.

No. 41 MGM EXCESS FLOW CHECK VALVE has male pipe thread on top and bottom ends and female pipe thread in lower end.

Size designation is by code following the basic item number and separated from it by a colon. Each thread size is represented by a letter as shown in the table of sizes, the top male thread being indicated first (after the colon), the bottom male thread second, if there is one, and the female thread last. Example: 40:IG is number 40 (having only one male and one female thread) with 2" male pipe thread on top end, and 1 1/4" female pipe thread in bottom end. Example: 41JIG is number 41 (having two male threads and one female thread) with 2 1/2" male pipe thread on top end, 2" male pipe thread on bottom end, and 1 1/4" female pipe thread in bottom end. See Price Sheet for list of sizes.

Flow is toward the female thread.

No. 141 MGM EXCESS FLOW CHECK VALVES are identical in effective dimensions, and in flow characteristics, with valves of comparable size in the Nos. 40 and 41 MGM Excess Check Flow Valves, but have been designed to provide an extra female pipe thread in the inlet end.

No. 141 MGM Excess Flow Check Valves are made entirely of steel and stainless steel. They are machined from solid bar steel and have one weld in the body. Valve stem, valve head, spring, and cotter pin are made of stainless steel. Guide, nut and body are made of carbon steel. body is cadmium plated. Valves made entirely of stainless steel can be furnished.

Click here for a complete No. 141 Brochure (PDF)

No. 166 MGM EXCESS FLOW CHECK VALVES are flange type valves, made entirely of steel and stainless steel. Guide, nut, and body are made of carbon steel. Valve stem, spring, and cotter pin are made of stainless steel. Valve head on sizes 2" through 3 1/2" is made of stainless steel. Valve head on sizes 4" through 10" is made of carbon steel. Body is cadmium plated. Valves made entirely of stainless steel can be furnished. All valves are set for their rated flow and should not be changed. Parts are not sold separately.

Click here for a complete No. 166 Brochure (PDF)

No. 189 MGM EXCESS FLOW CHECK VALVES flanged on each end are made to fit between American Standard pipe flanges of the size indicated by the customer.

300 pound Size Flange - Standard
150 pound Size Flange - Available upon request

Click here for a complete No. 189 Brochure (PDF)

No. 217 SERIES MGM EXCESS FLOW CHECK VALVES flange will fit inside the bolts of 150 pound or 300 pound American Standard Steel pipe flanges. Valves are customized to slip inside Schedule 160 pipe or pipe size with larger inside diameter than schedule 160 pipe.

Click here for a complete No. 217 Brochure (PDF)

No. 112 SERIES MGM EXCESS FLOW CHECK VALVES of carbon steel can be used for propane, butane, and other liquefied petroleum gases, and ammonia and other pressure liquids not corrosive to this metal. Stainless steel valves should be used for more highly corrosive liquids or where excessive moisture is present. All carbon steel and stainless steel valves have balls and pins made of stainless steel.

All threads are American Standard taper pipe threads.

Listed under Reexamination Service of Underwriters' Laboratories, Inc. for propane, butane and ammonia. The Metal Goods Manufacturing Company is listed in U.S. Coast Guard Equipment List CG-190, as an acceptable manufacturer of valves and fittings. Acceptable for use on vessels classed with the American Bureau of Shipping, provided the installation is carried out to the satisfaction of the Bureau's surveyors. The purchaser should inform the manufacturer of the exact service for which the item is intended.