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Lohms represent resistance in a fluid system.
Lohm is a measure of resistance to flow. The higher the Lohm rate, the more restrictive the flow. The maximum Lohm rating of the part is your flow criteria for the part.

The Lee Company offers low leak, highly reliable check valves constructed with metal-to-metal valve seals that are rated for leakage of less than one drop per hour at the rated system pressure. Elastomeric valve seal configurations are available for applications where it is critical to eliminate any leakage, such as in pneumatic systems.

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Field Serviceable Check Valves
The Lee Company’s line of Power Generation Check Valves are designed for use in purge air, water injection, and liquid fuel applications.
Key Product Facts
  • Power Generation Check Valve
  • Diameter: Inline Fitting
  • Lohm Rate: 16 Lohms max
  • Operating Pressures: Up to 1500 psi
  • Leakage: 0 drops / minute
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1000 Hi-Q Check Valve
This check valve’s unique design maximizes the free flow in a very short, compact package and is ideal for applications with flow rates up to 80 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 1 inch
  • Lohm Rate: 3.5 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
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250 Extreme Environment Check Valve
This zero-leak check valve is designed to withstand high temperatures and pressures for flow rates up to 1.5 GPM. NACE compliant materials are available.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 230 Lohms max
  • Operating Pressures: Up to 15,000 psi
  • Leakage: 0 bubbles / minute at 500-15,000 psid
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375 Lo-Lohm Check Valve
This valve features a poppet-style design to maximize the free flow and prevent flow in the other direction. It is ideal for flow rates up to 12 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.375 inches
  • Lohm Rate: 24 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 1 drop / hour at 3000 psi
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500 Zero-Leak Check Valve
This check valve provides zero leakage in the checked direction and is ideal for pneumatic and hydraulic applications with flow up to 12 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.5 inches
  • Lohm Rate: 25 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 0 bubbles / minute
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375 High Pressure, Pilot-Operated Check Valve
This valve acts like a normal check valve until pressure is applied to the pilot port, at which point flow is allowed in the direction that is normally blocked.
Key Product Facts
  • Pilot-Operated Check Valves
  • Diameter: 0.375 inches
  • Lohm Rate: 110 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
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187 Lo-Lohm Check Valve
This valve features a poppet-style design to maximize flow. It is ideal for flow rates up to 3 GPM. An integral safety screen is available.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 100 Lohms max
  • Operating Pressures: Up to 4000 psi
  • Leakage: 1 drop / hour at 4000 psi
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250 High Pressure Check Valve
This miniature, high pressure check valve is ideal for high pressure systems up to 8000 psi with flow rates up to 5 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 60 Lohms max
  • Operating Pressures: Up to 8000 psi
  • Leakage: 1 drop / hour at 8000 psi
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343 Side-Exit Check Valve
This check valve’s side-exit design is useful in manifolds where the flow needs to change direction. It is ideal for applications with flow rates up to 10 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.343 inches
  • Lohm Rate: 30 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
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750 Hi-Q Check Valve
This check valve’s unique design maximizes the free flow in a very short, compact package and is ideal for applications with flow rates up to 40 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.75 inches
  • Lohm Rate: 7.5 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
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187 Zero-Leak Check Valve
This check valve provides zero leakage and is ideal for pneumatic and hydraulic applications with flow up to 0.8 GPM. An integral screen is available.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 400 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 0 bubbles / minute
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187 Axial Flow, 250 Lohm Check Valve
This valve features an economical ball-style design and is ideal for applications with flow rates up to 1.2 GPM.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 250 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 1 drop / hour at 3000 psi
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375 Extreme Environment Check Valve
This zero-leak check valve is designed to withstand high temperatures and pressures for flow rates up to 2.8 GPM. NACE compliant materials are available.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.375 inches
  • Lohm Rate: 125 Lohms max
  • Operating Pressures: Up to 15,000 psi
  • Leakage: 0 bubbles / minute at 500-15,000 psid
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500 Extreme Environment Check Valve
This zero-leak check valve is designed to withstand high temperatures and pressures for flow rates up to 7.8 GPM. NACE compliant materials are available.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.5 inches
  • Lohm Rate: 45 Lohms max
  • Operating Pressures: Up to 15,000 psi
  • Leakage: 0 bubbles / minute at 500-15,000 psid
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187 Extreme Environment Check Valve
This zero-leak check valve is designed to withstand high temperatures and pressures for flow rates up to 0.7 GPM. NACE compliant materials are available.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 500 Lohms max
  • Operating Pressures: Up to 15,000 psi
  • Leakage: 0 bubbles / minute at 500-15,000 psid
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187 HFS Check Valve
This valve’s unique design offers both high flow and high pressure capability in a compact package. It is ideal for flow rates up to 2.5 GPM.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 120 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
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250 HFS Check Valve
This valve’s unique design offers both high flow and high pressure capability in a compact package. It is ideal for flow rates up to 5.6 GPM.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 55 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
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500 High Pressure, Pilot-Operated Check Valve
This valve acts like a normal check valve until pressure is applied to the pilot port, at which point flow is allowed in the direction that is normally blocked.
Key Product Facts
  • Pilot-Operated Check Valves
  • Diameter: 0.5 inches
  • Lohm Rate: 60 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
View Product
250 High Pressure, Pilot-Operated Check Valve
This valve acts like a normal check valve until pressure is applied to the pilot port, at which point flow is allowed in the direction that is normally blocked.
Key Product Facts
  • Pilot-Operated Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 300 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
View Product
250 Pilot-Operated Check Valve
This valve acts like a normal check valve until pressure is applied to the pilot port, at which point flow is allowed in the direction that is normally blocked.
Key Product Facts
  • Pilot-Operated Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 300 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 1 drop / hour at 3000 psi
View Product
500 High Pressure Check Valve
This miniature, high pressure check valve is ideal for high pressure systems up to 8000 psi with flow rates up to 20 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.5 inches
  • Lohm Rate: 15 Lohms max
  • Operating Pressures: Up to 8000 psi
  • Leakage: 1 drop / hour at 8000 psi
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375 High Pressure Check Valve
This miniature, high pressure check valve is ideal for high pressure systems up to 8000 psi with flow rates up to 11 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.375 inches
  • Lohm Rate: 27 Lohms max
  • Operating Pressures: Up to 8000 psi
  • Leakage: 1 drop / hour at 8000 psi
View Product
156 HFS Check Valve
This valve’s unique design offers both high flow and high pressure capability in a compact package. It is ideal for flow rates up to 1.2 GPM.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.156 inches
  • Lohm Rate: 250 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
View Product
187 High Pressure Check Valve
This miniature, high pressure check valve is ideal for high pressure systems up to 8000 psi with flow rates up to 1.5 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 210 Lohms max
  • Operating Pressures: Up to 8000 psi
  • Leakage: 1 drop / hour at 8000 psi
View Product
187 Axial Flow Check Valve
This valve features an economical ball-style design and is ideal for applications with flow rates up to 0.8 GPM. An integral safety screen is available.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 400 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 1 drop / hour at 3000 psi
View Product
125 High Pressure Check Valve
This miniature, high pressure check valve is ideal for high pressure systems up to 8000 psi with flow rates up to 0.8 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.125 inches
  • Lohm Rate: 400 Lohms max
  • Operating Pressures: Up to 8000 psi
  • Leakage: 1 drop / hour at 8000 psi
View Product
375 Zero-Leak Check Valve
This check valve provides zero leakage in the checked direction and is ideal for pneumatic and hydraulic applications with flow up to 6 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.375 inches
  • Lohm Rate: 45 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 0 bubbles / minute
View Product
250 Zero-Leak Check Valve
This check valve provides zero leakage in the checked direction and is ideal for pneumatic and hydraulic applications with flow up to 1.7 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 180 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 0 bubbles / minute
View Product
500 Hi-Q Check Valve
This check valve’s unique design maximizes the free flow in a very short, compact package and is ideal for applications with flow rates up to 22 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.5 inches
  • Lohm Rate: 14 Lohms max
  • Operating Pressures: Up to 5000 psi
  • Leakage: 1 drop / hour at 5000 psi
View Product
500 Hi-Q Insert Check Valve
This check valve’s unique design maximizes the free flow in a very short, compact package and is ideal for applications with flow rates up to 22 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.5 inches
  • Lohm Rate: 14 Lohms max
  • Operating Pressures: Up to 4000 psi
  • Leakage: 1 drop / hour at 4000 psi
View Product
500 Lo-Lohm Check Valve
This valve features a poppet-style design to maximize the free flow and prevent flow in the other direction. It is ideal for flow rates up to 25 GPM
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.5 inches
  • Lohm Rate: 12 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 1 drop / hour at 3000 psi
View Product
250 Lo-Lohm Check Valve
This valve features a poppet-style design to maximize the free flow and prevent flow in the other direction. It is ideal for flow rates up to 6 GPM.
Key Product Facts
  • Poppet-Style Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 50 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 1 drop / hour at 3000 psi
View Product
187 Side-Exit Check Valve
This valve features an economical ball-style design and is ideal for applications with flow rates up to 2.2 GPM. An integral safety screen is available.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.187 inches
  • Lohm Rate: 140 Lohms max
  • Operating Pressures: Up to 4000 psi
  • Leakage: 1 drop / hour at 4000 psi
View Product
093 Side-Exit Check Valve
This valve features an economical ball-style design and is ideal for applications with flow rates up to 0.5 GPM. An integral safety screen is available.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.093 inches
  • Lohm Rate: 700 Lohms max
  • Operating Pressures: Up to 4000 psi
  • Leakage: 1 drop / hour at 4000 psi
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250 Axial Flow Check Valve
This valve features an economical ball-style design and is ideal for applications with flow rates up to 1.8 GPM. An integral safety screen is available.
Key Product Facts
  • Ball-Style Check Valves
  • Diameter: 0.25 inches
  • Lohm Rate: 175 Lohms max
  • Operating Pressures: Up to 3000 psi
  • Leakage: 1 drop / hour at 3000 psi
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