4CK SERIES CHECK VALVE PILOT TO OPEN


APPLICATION
Pilot check valves allow flow to pass in one direction, with a low pressure drop, then prevent reverse flow until pilot pressure is applied. There are many applications for this valve type, the most common being to lock and hold a cylinder, or another hydraulic
actuator, in position.The 4CK30 is a small cartridge valve and is ideally suited for fitting directly into a cylinder, giving economy of installation, direct control of cylinder movement and ease of servicing.
OPERATION
Pressure on the valve port causes the poppet to lift against the spring force, allowing the flow to the cylinder port. Reverse flow is prevented by the poppet reseating. Pressure applied to the pilot port will overcome the cylinder port pressure and lift the poppet from its seat, allowing flow from the cylinder to valve port.
FEATURES
Hardened and ground poppet gives excellent flow capability for valve size, positive sealing and long working life. Cartridge construction allows installation in actuators, manifold blocks and Hydraulic Integrated Circuits. Fits the same cavity as the 1CE30 overcentre valve
SPECIFICATIONS
Figures based on: Oil Temp = 40°C Viscosity = 40 cSt
Rated Flow 30 litres/min (8 US GPM)
Max Pressure 350 bar (5000 psi)
Pilot Ratio 3:1
Cartridge Material Working parts hardened and ground steel. Electroless zinc plated body
Body Material Standard aluminium (up to 210 bar*) Add suffix ‘377’ for steel option.
Mounting Position Unrestricted
Cavity Number A6610 (See Section 17)
Torque Cavity into Cartridge 45 Nm (33 lbs ft)
Weight 4CK30 0.08 kg (0.18 lbs)
4CK35 0.34 kg (0.75 lbs)
4CKK35 0.76 kg (1.67 lbs)
Seal Kit Number SK430 (Nitrile) SK430V (Viton)
Recommended Filtration Level BS5540/4 Class 18/13 (25 micron nominal)
Operating Temp -20°C to +90°C
Leakage 0.3 millilitres/min nominal
Nominal Viscosity Range：5 to 500 cSt


DUAL VALVE 3/8” 1/2” PORTS BASIC CODE:  4CKK34
DUAL CHECK VALVE (INTERNALLY CROSSED PILOTED)
Body ONLY part numbers
BSP, aluminium 3/8”B6836
SAE, aluminium 3/8”B10805   1/2”B30237
BSP, steel3/8” B13803
SAE, steel1/2” B11812


SINGLE VALVE 3/8” 1/2” PORTS BASIC CODE: 4CK35
Body ONLY part numbers
BSP, aluminium 3/8” B6743
SAE, aluminium  3/8” B10536  1/2” B7884
BSP, steel 3/8” B12823
SAE, steel  1/2”B11811




ORDERING CODE EXAMPLE 
Basic Code
4CK30 = Cartridge Only
4CK35 = Cartridge and Body
4CKK34 = Cartridges and Dual Body


Pilot Port Sizes：1 = Internal


Port Sizes - Bodied Valves Only
3W = 3/8” BSP. 1/4” BSP Pilot Port
6T  = 3/8” SAE. 1/4” SAE Pilot Port
8T  = 1/2” SAE. 1/4” SAE Pilot Port


Seals
S = Nitrile (For use with most industrial hydraulic oils)
SV = Viton (For high temperature and most special fluid applications)


Optional Pilot Seal：Omit if not required




EATON Piloted check valve 4CK301S/A6610 
401AA00001A Screw-in Cartridge Valves - 4CK301S PILOT CHECK 30 LPM, 3:1
Rated Flow 30 litres/min (8 US GPM)
Max Pressure 350 bar (5000 psi)
Pilot Ratio 3:1


Feature Code Description
SERIES 4CK30 30 L/MIN [8 USGPM];350 BAR [5000 PSI] PILOT TO OPEN CHECK VALVE - CARTRIDGE ONLY
PILOT PORT SIZE -1 INTERNAL
PORT SIZE _ NONE
SEAL -S NITRILE (FOR USE WITH MOST INDUSTRIAL HYDRAULIC OILS)
PILOT PISTON SEAL _ (_) NO PILOT SEAL
BODY MATERIAL _ ALUMINUM
SPECIAL FEATURES _ NONE


EATON VICKERS DANFOSSS CHECK VALVE 401AA00320A 4CK301P
EATON VICKERS DANFOSSS CHECK VALVE 401AA00063A 4CK301P3
EATON VICKERS DANFOSSS CHECK VALVE 401AA00001A 4CK301S
EATON VICKERS DANFOSSS CHECK VALVE 401AA00002A 4CK301S3
EATON VICKERS DANFOSSS CHECK VALVE 401AA00065A 4CK301SV
EATON VICKERS DANFOSSS CHECK VALVE 401AA00066A 4CK301SV3