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6-Way Directional Valve A - Simulate configuration A of hydraulic continuous 6-way directional valve

Library

Directional Valves

Description

The 6-Way Directional Valve A block simulates a configuration of hydraulic continuous 6-way directional valve with pump port P, two return ports T and T1, and three actuator ports A, B, and C. Use the valve for applications with two actuators, each being controlled by a valve of this type. When both valves are in neutral position, the pump is unloaded. If any of the valves is shifted from neutral, the diverting line is cut off and the respective actuator is fed at fuel pump pressure. For more details, see the Front-Loader Actuation System demo (sh_front_loader_actuation_system), which uses a similar system of two valves.

The 6-Way Directional Valve A block has six hydraulic connections, corresponding to the valve hydraulic ports (A, B, C, P, T, and T1), and one physical signal port connection (S), which controls the spool position. The block is built of six Variable Orifice blocks, connected as shown in the following diagram.

All blocks are controlled by the same position signal, provided through the physical signal port S, but the Orifice orientation parameter in the block instances is set in such a way that positive signal at port S opens the orifices colored blue in the block diagram (orifices P-A, B-T, and P-C2 ) and closes the orifices colored yellow (orifices A-T1, P-B, and P-C1). As a result, the openings of the orifices are computed as follows:

where

`h_PA`	Orifice opening for the `Variable Orifice P-A` block
`h_PB`	Orifice opening for the `Variable Orifice P-B` block
`h_AT1`	Orifice opening for the `Variable Orifice A-T1` block
`h_BT`	Orifice opening for the `Variable Orifice B-T` block
`h_PC1`	Orifice opening for the `Variable Orifice P-C1` block
`h_PC2`	Orifice opening for the `Variable Orifice P-C2` block
`h_PA0`	Initial opening for the `Variable Orifice P-A` block
`h_PB0`	Initial opening for the `Variable Orifice P-B` block
`h_AT10`	Initial opening for the `Variable Orifice A-T1` block
`h_BT0`	Initial opening for the `Variable Orifice B-T` block
`h_PC10`	Initial opening for the `Variable Orifice P-C1` block
`h_PC20`	Initial opening for the `Variable Orifice P-C2` block
`x`	Control member displacement from initial position

For information on the block parameterization options, basic parameter descriptions, assumptions and limitations, global and restricted parameters, see the 4-Way Directional Valve block reference page.

Dialog Box and Parameters

The block dialog box contains two tabs:

Basic Parameters

See the documentation for the Basic Parameters tab of the 4-Way Directional Valve block for parameter descriptions and default values.

Initial Openings

Orifice P-A initial opening: Initial opening for the Variable Orifice P-A block. The parameter can be positive (underlapped orifice), negative (overlapped orifice), or equal to zero for zero lap configuration. The default value is -0.0025 m.
Orifice P-B initial opening: Initial opening for the Variable Orifice P-B block. The parameter can be positive (underlapped orifice), negative (overlapped orifice), or equal to zero for zero lap configuration. The default value is -0.0025 m.
Orifice A-T1 initial opening: Initial opening for the Variable Orifice A-T1 block. The parameter can be positive (underlapped orifice), negative (overlapped orifice), or equal to zero for zero lap configuration. The default value is -0.0025 m.
Orifice B-T initial opening: Initial opening for the Variable Orifice B-T block. The parameter can be positive (underlapped orifice), negative (overlapped orifice), or equal to zero for zero lap configuration. The default value is -0.0025 m.
Orifice P-C1 initial opening: Initial opening for the Variable Orifice P-C1 block. The parameter can be positive (underlapped orifice), negative (overlapped orifice), or equal to zero for zero lap configuration. The default value is 0.0025 m.
Orifice P-C2 initial opening: Initial opening for the Variable Orifice P-C2 block. The parameter can be positive (underlapped orifice), negative (overlapped orifice), or equal to zero for zero lap configuration. The default value is 0.0025 m.

Ports

The block has the following ports:

P: Hydraulic conserving port associated with the pressure supply line inlet.
T: Hydraulic conserving port associated with the first return line connection.
T1: Hydraulic conserving port associated with the second return line connection.
A: Hydraulic conserving port associated with the actuator connection port.
B: Hydraulic conserving port associated with the actuator connection port.
C: Hydraulic conserving port associated with the actuator connection port.
S: Physical signal port to control spool displacement.