High-Flow, Low Cracking Pressure Flapper Check Valve

Improved Racing set out to design the highest flowing check valve we could and this is the result! Most check valve designs - including poppet check valves, ball check valves, diaphragm check valves, piston check valves, and others - are restrictive, resulting in a pressure drop across the valve even when fully open. Improved Racing's check valves use a flapper design, originally developed for military jet engine turbines, that swings completely out of the fluid's flow path, adding virtually no flow restriction. These check valves were further optimized for low restriction at high flow rates using flow simulation software and were designed to exceed most military specification requirements.

The valves have been tested at up to 1,000 psi of backflow holding pressure without catastrophic failures or excessive leakage. This allows us to very safely rate these valves to hold 300 psi of backflow pressure under normal operating conditions with a very high factor of safety. For comparison, the military surplus flapper check valves we tested failed catastrophically with complete pressure loss at less than 200 psi.

This flapper style valve has a very low cracking pressure of less than 0.05 psi. Every internal component (hinge, spring, hinge pin, and gasket core) is made from stainless steel to ensure long lasting, reliable performance and compatibility with just about any fluid, including corrosive fluids. 

The check valve's gasket is made from FKM (Viton®) rubber bonded to a stainless steel core, giving it a high operating temperature of up to 302°F. It's also highly chemical resistant and compatible with all types of fuel.

Improved Racing's check valves are available in multiple fitting sizes, and the inlet and outlet halves can be mixed and matched to create a completely custom valve using our custom check valve configurator.

Features and Specifications

• Flapper design allows for very high flow with low restriction
• Design optimized using flow simulation software
• FKM (Viton®) rubber seal
• All stainless steel internal components for compatibility with a wide range of fluids
• 6061-T6 billet aluminum body with black MIL-A-8625 Type II anodized finish
• Laser marked with flow direction and hinge location per military specification
• Maximum operating backflow holding pressure of 300 psi, burst backflow holding pressure of over 1,000 psi
• Maximum unchecked (normal direction of flow) operating pressure of over 1,000 PSI
• -40°F to 302°F operating temperature range
• Made in USA
• Lifetime Warranty

Dimensions

-8AN Male, Part # FCV-12-08AM

-10AN Male, Part # FCV-12-10AM

-10AN O-Ring Boss Female, Part # FCV-12-10RF

-12AN Male, Part # FCV-12-12AM

Applications

• Ideal for use in oiling systems (wet sump and dry sump), fuel systems, crankcase pressure ventilation systems, and more.