LMI 48721 Foot Valve Assembly
$81.42
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Model: LMI 48721
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Type: Foot Valve Assembly with integral check valve
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Compatibility: Designed for use with select LMI metering pumps
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Function: Prevents backflow and helps maintain prime
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Installation: Submersible, attaches to the suction tubing inside the chemical tank
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Construction: Built from chemically resistant materials (exact material depends on model variation)
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Includes: Valve body, screen/strainer, and check mechanism
LMI’s [48721 | FOOT VALVE, 920, 930, 940 ] is a valve assembly that is listed as used on LE [920SI, 930SI, 940SI, 928SI, 938SI, 948SI, 828SI, 838SI, 848SI, 828NI, 838NI, 848NI, , ]
Key Specs
Used With: 920SI-250, 920SI-150, 930SI, 940SI, 928SI-250, 928SI-150, 938SI, 948SI, 828SI-150, 828SI-250, 838SI, 848SI, 828NI-150, 828NI-250, 838NI, 848NI, 920HI-150, 930HI, 940HI, 928HI-150, 938HI, 948HI
Performance Features & Operational Guidelines
Review the mechanical features, installation position, and component protection provided by the LMI 48721 assembly:
Check Mechanism & Chemical Protection Features
- Positive Sealing: High-density ceramic check ball creates an airtight seal against back-siphoning under low-head pressures.
- Integrated Strainer Housing: Slotted bottom cage elevates the suction point above bottom tank sediment while straining floating solids.
- Weighted Submergence: Heavy body design prevents the foot valve from curling upward or floating to the chemical liquid surface.
- Tubing Retention: Features an integrated compression nut profile to lock suction tubing tight under vacuum pull.
Primary Applications & Use Cases:
- Hypochlorite & Chlorine Injection: Holds prime on sodium hypochlorite lines to prevent off-gassing vapour lock.
- Acid & Caustic Feed Systems: Delivers safe suction draw for pH neutraliser feed loops in industrial wastewater.
- Cooling Tower & Boiler Treatment: Serves as the primary suction intake for inhibitor and biocide dosing pumps.
- Water Well Disinfection: Main line suction strainer for wellhead chemical chlorination systems.
No replacement parts listed for this item yet.
FAQs
- What is the primary function of the LMI 48721 foot valve assembly?
The foot valve sits submerged at the bottom of a chemical tank to maintain a one-way fluid prime inside the pump suction tubing. It prevents backflow into the chemical container during off-cycles and filters out solid debris before fluid reaches the pump head. - Which LMI metering pump models use the 48721 replacement foot valve?
This foot valve is specifically engineered for LMI LE series liquid ends, including popular 920SI, 928SI, 930SI, 940SI, 828SI, 838SI, 848SI, 828NI, and 838NI pump models (in 150 and 250 sizing options). - Why is my chemical metering pump losing prime without an LMI suction foot valve?
Without a functional foot valve, gravity and system pressure cause fluid inside the suction tube to drain back into the chemical storage tank when the pump stops. When the pump turns back on, it pulls air instead of liquid, leading to air binding and zero chemical output. - How do I clean the strainer screen on this chemical feed foot valve?
Periodically lift the foot valve out of the chemical tank, rinse it in clean water or a neutral cleaning solution, and remove any accumulated scale or crystalline debris from the outer strainer slots. - How far off the bottom of the chemical tank should the foot valve be installed?
Suspend the foot valve roughly 1 to 2 inches off the absolute bottom of the chemical vessel. This prevents the suction intake from drawing in dense chemical sludge or settled solids.
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