This section gives basic specifications for the complete line of Vickers threaded cartridge flow control valves. Its purpose is to provide a quick, convenient reference tool when choosing Vickers cartridge valves or designing a system using these components.
Valve Features and Benefits
Eaton offers a complete range of Vickers flow controls cartridge valves, with a variety of features, including:
• Products in this catalog have been Fatigue tested to one million cycles at 132% or 10 million cycles at 115% of rated pressure.
• Non-adjustable, pressure compensated, flow regulator for flows to 227 L/min (60 USgpm).
• Adjustable, pressure compensated, flow regulator for flows to 114 L/min (30 USgpm).
• Fixed and adjustable priority bypass type flow regulator for regulated flows to 114 L/min (30 USgpm).
• Adjustable flow control without free reverse flow check with flows rated to 114 L/min (30 gpm).
• Adjustable flow control with free reverse flow check with flows rated to 45 L/min (12 gpm).
• Needle valves with flows rated to 265 L/min (70 USgpm).
• Velocity fuses with flows rated to 227 L/min (60 USgpm).
• Flow divider/combiners (FDC1 and FDC11) with flows rated to 568 L/min (150 USgpm).
• Posi-traction valves (FDC13) with flows rated to 567 L/min (150 USgpm)
• Operating pressures to 350 bar (5000 psi).
Here are some of the benefits of Vickers flow controls:
• All operating parts are hardened steel, ground and honed for long life and low leakage.
• Designed for maximum flexibility and minimal space requirements.
• All exposed cartridge surfaces are zinc dichromate plated to resist corrosion. Steel housings are available for cartridges rated to 350 bar (5000 psi) application pressures.
• All aluminum manifolds are gold anodized to resist corrosion.
• Reliable, economical and compact.
• Low leakage.
• Variety of adjustment options.
• Adjustments designed not to go spring solid at "full in" position or to allow the adjustment to be removed when
backed out.
Notable are the two styles of flow divider/combiner:
FDC1/FDC11
The FDC*1 is a cartridge type hydraulic flow dividercombiner valve. It divides and combines flow, regardless of system load or pressure, proportionally per specified flow division.
For example: FDC*1-10-*-66 will divide an incoming flow of 45 L/min (12 USgpm) equally out each port with
an accuracy of 10% each side. With 45 L/min (12 USgpm) in at "3" port, flow out port "4" can be 22 L/min (6 USgpm) 4,5 L/min (1.2 USgpm) while flow at port "2" is 22,7 L/min (6 USgpm) 4,5 L/min (1.2 USgpm).
The combining accuracy is the same with incoming flow at port "4" and "2" and flow out port "3" of 45 L/min (12 USgpm). Inlet flow at port "4" will be 22 L/min (6 USgpm) 4,5 L/min (1.2 USgpm). Inlet flow at port "2" will be 22 L/min (6 USgpm) 4,5 L/min (1.2 USgpm).
Flow division or combining will be maintained even if unequal loads are placed on ports "4" and "2".
A special feature of the FDC*1-** is that it provides rephase flow to either port 2 or port 4 when one of the two is blocked. This feature is useful in hydraulic circuits that require cylinders to move at the same time. If one cylinder bottoms out first, the opposite cylinder is provided with "rephase" flow to allow the cylinder to bottom and start the cylinders together for movement in the opposite direction.
FDC3/FDC13
The FDC*3 is a cartridge type positive traction valve that divides and combines flow, regardless of system load or pressure, proportionally per specified flow division. This valve is used in place of a standard flow dividercombiner in systems where hydraulic motors are used as drive wheels on each side of the machine. The
positive traction valve acts much like a standard flow divider-combiner as the vehicle travels in a straight line. Equal amounts of flow go to each "C" port. As the vehicle turns a corner, a standard flow divider will maintain equal flow to each drive motor. On a turn, it is necessary for the outer wheel to turn faster than the inner wheel. A standard flow divider-combiner will provide equal flow to each motor causing the drive motors to skid. The positive traction valve solves this problem by allowing the one motor to turn faster than the other.
This operates in a similar way as a mechanical differential on an automobile. In a turn, the inside drive motor is restricted and builds up pressure, while the outside drive motor is without restriction. Under conditions of high differential pressure, the positive traction valve passes extra flow to the least restricted motor to prevent skidding.
Under straight running conditions the differential pressure is low and equal amounts of flow are provided to each drive motor.
Produs de: Eaton
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