Spotlight on Innovation: 6mm Zero Leak Press-In Check Valve

Published On: May 23rd, 2024

The new 6 mm Zero Leak Press-In Check Valve is a miniature, cartridge-style check valve specifically designed for installation into plastic housings, manifolds, or tubing. This valve uses a soft seat to ensure efficient and leak-free operation in both hydraulic and pneumatic systems.

The valve’s unique press-in design ensures easy installation and retention, preventing bypass leakage. It can be installed bidirectionally for both forward and reverse flow capabilities, providing design flexibility. Its robust design and 100% performance testing guarantee long-term operation in a wide range of applications.

Standard offerings are available with either FKM or EPDM seals for a range of fluid and temperature compatibility. If the standard seal materials are not suitable for your application, other seal materials are available upon request. Please contact us for more information

The VHS Series valve is 100% functionally tested for performance and designed with materials that will ensure consistent, long-term operation. Available in different mounting styles and material options, performance characteristics can be further optimized to meet specific application requirements.


  • Soft seat ensures efficient and leak-free operation in hydraulic and pneumatic systems
  • 100% performance tested to eliminate rework
  • Simple, bidirectional installation provides design flexibility with forward or reverse flow capabilities


To install, simply press the valve into a plastic installation hole until the valve is, at a minimum, flush with the top of the installation hole. The valve can be installed in either direction, providing forward or reverse flow capabilities. Lee installation tools for each flow orientation are available. See Installation Procedures “IP CZPM 6.0 F” and “IP CZPM 6.0 R” for more information, or contact your local Lee Sales Engineer for installation support.

These valves can be pressed directly into plastics that have sufficient elongation, such as Nylon, Polyethylene, Polypropylene, Acetal, and PEEK. For installation into other plastics, contact your Lee Sales Engineer for more information. Note that 6 mm Zero Leak Press-In Valves are not designed to be installed into metal.

Lee Lohm Laws: Working With Liquids & Gases

Engineers will be interested in our simple method of defining and measuring the resistance to fluid flow for hydraulic and pneumatic components. Just as the Ohm is used in electrical engineering, we find that we can use a liquid Ohm or “Lohm” to good advantage on all hydraulic and pneumatic computations. When using the Lohm, you can forget about coefficients of discharge and dimensional tolerances on drilled holes. These factors are automatically compensated for in the Lohm calculations and confirmed by our testing of each component to establish flow tolerances. The resistance to flow of any fluid component can be expressed in Lohms. Due to the differences in fluid properties between gases and liquids, the equations for calculating the relationship between flow restriction, pressure differential, and flow rate are different.