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The 4CKKT50-3-S-3-35 check valve is produced by Vickers within the Check Valves series for hydraulic automation circuits where reverse flow must be blocked. It installs as a screw-in cartridge so technicians can remove it from a manifold without disturbing external lines. The cavity follows the A12744 standard, allowing drop-in replacement when machining on that pocket size is already complete. Porting is cartridge only, which shifts all line routing to the manifold block rather than the valve body. Four valve ports are provided to manage the main flow and the pilot passages required in complex circuits. A pilot piston seal is included to stop oil from bypassing the pilot chamber. The 3:1 pilot ratio means a relatively low pilot pressure is enough to shift the poppet. Overall height is 1.000 in, supporting compact stack designs in restricted spaces.
The valve accommodates a rated flow of 25 L/min so medium-sized actuators can cycle at typical industrial speeds. Its pressure setting of 350 bar defines the cracking point at which the poppet starts to open under pilot influence. Continuous duty is limited to a maximum operating pressure of 300 bar to protect internal components from overstress. Internal leakage is limited to 0.3 cc/min, helping cylinders hold position without frequent pump compensation. The minimum operating temperature is −20 °C, allowing cold-start operation in outdoor machinery. The maximum operating temperature reaches 90 °C to suit systems where oil sees elevated heat. Four housing ports are available so installers can match the cartridge to manifold passages without additional fittings.
Cavity
A12744
Height
1.000 in
Installation Type
Screw-In Cartridge
Internal Leakage
0.3 cc/min
Maximum Operating Pressure
300 bar
Maximum Operating Temperature
90 C
Minimum Operating Temperature
-20 C
Number Of Housing Ports
4
Number Of Valve Ports
4
Pilot Piston Seal
Yes
Pilot Ratio
3:1
Port Type
Cartridge Only
Pressure Setting
350 bar
Rated Flow
25 L/min
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