Miniature check valve for harsh duty applications

A Lo-Lohm check valve which is specifically designed to provide optimal performance in harsh duty service in oil tool applications, is a new addition to the range of Lee Products miniature components

The Lee 440C check valve is constructed entirely from corrosion-resistant stainless steel and features a durable poppet and seat to ensure longer cycle life and increased resistance to damage from contamination, resulting in improved overall system performance.

Available in four standard sizes and in forward and reverse flow directions, the 440C valve is designed to save space and weight and offers a high flow capability relative to its compact size.

Sizes range from 0.187" up to 0.500" in diameter, with free flow Lohm* rates from 100 up to 12 Lohms.

The valves are available with cracking pressures of 5 +/-3 and 1 +/-0.5 psid.

Every Lee Check valve is 100% tested and inspected to ensure a reliable, consistent performance and so eliminates the need for time-consuming, in-house testing.

Special, custom-made versions are also available on request, for example models made from MP35N which meet NACE MR0175 requirements where operating environments are extremely corrosive.

*Every engineer will be interested in this simple Lee Product system of defining the fluid resistance of Lee hydraulic components.

Just as the Ohm is used in the electrical industry, we find that we can use a liquid Ohm, or "Lohm" to good advantage on all hydraulic computations.

When using the Lohm system coefficients of discharge and dimensional tolerances on drilled holes can be forgotten.

These factors are automatically compensated for in the Lohm calculations and confirmed by testing each component to establish flow tolerances, therefore the resistance to flow of any fluid control component can be expressed in Lohms.

The Lohm has been selected so that a 1 Lohm restriction will permit a flow of 100 gallons per minute of water with a pressure drop of 25 psi at a temperature of 80F.

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