DCV 43 Close
4-way 3-position cross-close-parallel directional control valve
The DCV 43 Close component is a four-port, three-position valve. The area between pairs of ports varies as a function of the spool input signal, s, and the parameters Amax, Amin, and band. The following table gives the areas for three values of the spool input.
Transitions are centered at the midpoint, with the width given by the band parameter, as shown in the following diagram.
Two approaches were taken for formulation of the flow equation inside the device. When the boolean parameter Use constant Cd is true, a constant coefficient of discharge (Cd) is used, otherwise a variable coefficient of discharge with maximum value (Cd⁡max) and a critical flow number (Critno) are used.
The boolean parameters Use volume A, Use volume B, Use volume P, and Use volume T, when true, add optional volumes VA, VB, VP, and VT to ports A, B, P, and T, respectively. See Port Volumes for details.
If two orifices or valves are connected, enabling a volume at the common port reduces the stiffness of the system and improves the solvability.
Hydraulic port A
Hydraulic port P (pump)
Hydraulic port T (tank)
Spool input signal
Maximum orifice opening area; available when use scales is true
Minimum orifice opening area (leakage)
Transition length in normalized spool displacement units
Use constant Cd
True (checked) means a constant coefficient of discharge is implemented, otherwise a variable Cd is used in flow calculation
Flow-discharge coefficient; used when Use constant Cd is true
Reynolds number at critical flow; used when Use constant Cd is true
Maximum flow-discharge coefficient; used when Use constant Cd is false
Critical flow number; used when Use constant Cd is false
X corresponds to ports A, B, P, and T.
Use volume X
True (checked) means a hydraulic volume chamber is added to portX
Volume of chamber attached to portX
For more information see Port Volumes.
Directional Control Valves
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