Pilot-Operated Check Valve Test Rig

Open Model

This example shows a test rig for the Pilot-Operated Check Valve (IL) block. The valve connects to three ideal pressure sources, two of which create the pressure differential across the main flow line, while the third applies pressure to the pilot port X. This pressure allows flow through the valve even if the main pressure differential is negative.

Model

Simulation Results from Scopes

Simulation Results from Simscape Logging

The plots below show the behavior of the pilot-operated check valve under various pressure conditions. The valve opens when the control pressure is larger than the cracking pressure differential. The control pressure is $p_{pilot}k_p+(p_A-p_B)$, where $p_{pilot}$ is the pilot pressure determined using the pressure at port X and $k_p$ is the pilot ratio. If the pilot pressure is sufficiently large, the valve opens even if the pressure differential $p_A-p_B$ is negative. With $p_A-p_B<0$ and the valve opened, fluid flows from port B to port A.

See Also