Eaton leads the industry in screw-in cartridge valve (SiCV) technology with a wide selection of hydraulic valves for both stationary and mobile equipment. This product line includes pressure, flow, proportional and logic element screw-in cartridge valves and hydraulic integrated circuits.

Overcenter valves give static and dynamic control of loads by supplying a counterbalance pressure to the actuator. They prevent runaway in the event of hose burst and hold the load with minimal leakage. The pressure balanced valve is unaffected by back pressure, allowing service line reliefs to operate and for the valve to be used in regenerative or proportional valve systems. The overcenter valve should be mounted either into, onto or  as close to the actuator as possible to give maximum protection. Single overcenter valves control unidirectional loads such as in aerial platforms, cranes or winches and dual overcenters are suited to bi-directional motion such as wheel motor applications or cylinders going over center.

Fully balanced, pilot assisted relief with check
120 L/min (32 USgpm). 270 bar (4000 psi)
The check section allows free flow into the actuator then holds and locks the load against  movement. The pilot assisted relief valve section will give controlled movement when pilot  pressure is applied. The relief section is normally set to open at a pressure at least  1.3 times the maximum load induced pressure but the pressure required to open the valve and allow movement depends on the pilot ratio of the valve. For optimization of  load control and energy usage, a choice of pilot ratios is available. The pressure required  to open the valve and start actuator movement can be calculated as follows:
           Pilot  Pressure =
(Relief Setting) - (Load Pressure)
               Pilot Ratio

Specifications:
Max load induced pressure: 270 bar [4000 psi]
Max relief setting: 350 bar (5000 psi)
Rated Flow: 120 L/Min [32 US gpm]
Mounting position: Unrestricted
Leakage: 0.3 milliliters/min nominal (5 dpm)
Cavity Number: A877 (See Section M)
Nitrile Seal Kit: SK417

Viton Seal Kit: SK417V
Weight: 0.59 kg [1.30 lb]

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