How do I make my hydraulic circuit simpler, safer and more reliable, while keeping an eye on costs? It’s a dilemma we come across all the time here at Webtec. In fact, we saw it recently in a project involving oil well safety equipment, where the designer wanted to meet these objectives by moving from two valves in the existing circuit, to just one. The safety system featured a shut-off / isolating valve to hold pressure inside the circuit’s accumulator and a 3-position / 4-port spool valve to control flow direction.

The idea was to eliminate the shut-off valve, but the tendency of spool valves to leak slightly in the closed position would not hold accumulator pressure when the cylinder was idle and, subsequently, not guarantee the availability of power in an emergency. The answer was to adopt a 180 series zero-leak rotary shear directional control valve from Webtec. The optically flat, mirror finishes of the hardened and lapped valve seats and rotor provide metal-to-metal contact with zero leakage. With only one valve needed for both zero-leak and directional control, the engineer could dispense with the isolating valve, saving cost, space and inventory.

See our full range of directional control valves here

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Posted by Webtec

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