4CK30 Series Single Pilot Operated Cartridge Check Valves, Up To 5000 PSI & 8 GPM

Description & Features

Cartridge	Model 4CK30, sold separately
Flow Rating	8 GPM
Housing	Cavity Size A6610, sold separately.
Maximum Operating Pressure	5000 PSI
Pilot Ratios	3:1
Recommended Filtration	Cleanliness level 19/13 or better
Temperature Range	-22° to +194°F

Model Number	Part Number	Cracking Pressure (psi)	Seal Material	Features	Price	Action
4CK301S 4CK30 Series Cartridge Valve	401AA00001A	29	Nitrile	350 bar (5000 psi) & 227 L/min (60 USgpm)\|High operational efficiency\|Low spring settings

Question by: Ronnie R on Sep 9, 2025, 7:52 PM

I'm using a single acting cylinder, so I need to make sure I'm using the right unlocking pressure. Can you remind me what it should be?

Answer by: Customer Support on Sep 11, 2025, 6:52 AM

For single acting cylinders, the pressure required in the pilot circuit should be 25% of the locked pressure.