Spotlight on Innovation: 6 mm ZERO LEAK FORWARD CHECK VALVE

Published On: May 30th, 2024

The new 6 mm Zero Leak Forward Check Valve is a miniature, cartridge-style check valve specifically designed for installation into metal fittings and manifolds. This valve uses a soft seat that ensures efficient and leak-free operation in both hydraulic and pneumatic systems. The valve’s robust design and 100% performance testing guarantee long-term operation in a range of applications. It uses our field-proven Controlled Expansion Principal that provides secure retention and eliminates the need for threads, O-rings, or secondary retainers. To install, simply insert the valve into a drilled installation hole and drive the expansion pin flush to seal and lock the valve in place.

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 your local Lee Sales Engineer for more information.

  • Soft seat ensures efficient and leak-free operation in hydraulic and pneumatic systems
  • 100% performance tested to eliminate rework
  • Simple installation method provides secure retention and eliminates the potential for bypass leakage

Installation of the Zero Leak Forward Check Valve(s)

After placing the valve into a drilled installation hole, use the installation tool to drive the expander pin to within 0.25 mm above flush of the check valve body. The installation force and tool travel should be monitored for proper installation. The required installation force is a function of boss material, installation hole dimensions, and boss geometry. A boss constructed with thick or robust materials necessitates a greater installation force compared to one crafted from softer materials or possessing thinner walls. It is important to establish the correct force to achieve the necessary pin flushness with your unique housing material, geometry, and installation press.

Installation Force

  • 6061 Aluminum (40 HRA): 5800 N (1300 lbf)
  • 303 Stainless Steel (23 HRC): 7200 N (1620 lbf)
  • 4140 Steel (43 HRC): 9000 N (2000 lbf)
  • A2 Steel (57 HRC): 9200 N (2050 lbf)

Flow Performance

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.