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4-Way Directional Valve G - Simulate configuration G of hydraulic continuous 4-way directional valve

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Directional Valves

Description

The 4-Way Directional Valve G block simulates a configuration of hydraulic continuous 4-way directional valve. Ports A and B are connected to port P in the right valve position. In the left position, port P is connected to port B, while port A is connected to port T. In neutral position, ports A and B are connected to port T. The fluid is pumped in the valve through the inlet line P and is distributed between two outside hydraulic lines A and B (usually connected to a double-acting actuator) and the return line T. The block has four hydraulic connections, corresponding to inlet port (P), actuator ports (A and B), and return port (T), 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 Variable Orifice 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-B1, A-T, and T1-T) and closes the orifices colored yellow (orifices P-A, B-T1, and P-B2). As a result, the openings of the orifices are computed as follows:

where

`h_PB1`	Orifice opening for the `Variable Orifice P-B1` block
`h_PB2`	Orifice opening for the `Variable Orifice P-B2` block
`h_BT1`	Orifice opening for the `Variable Orifice B-T1` block
`h_T1T`	Orifice opening for the `Variable Orifice T1-T` block
`h_PA`	Orifice opening for the `Variable Orifice P-A` block
`h_AT`	Orifice opening for the `Variable Orifice A-T` block
`h_PB10`	Initial opening for the `Variable Orifice P-B1` block
`h_PB20`	Initial opening for the `Variable Orifice P-B2` block
`h_BT10`	Initial opening for the `Variable Orifice B-T1` block
`h_T1T0`	Initial opening for the `Variable Orifice T1-T` block
`h_PA0`	Initial opening for the `Variable Orifice P-A` block
`h_AT0`	Initial opening for the `Variable Orifice A-T` 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-B1 initial opening: Initial opening for the Variable Orifice P-B1 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-B2 initial opening: Initial opening for the Variable Orifice P-B2 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-T1 initial opening: Initial opening for the Variable Orifice B-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 T1-T initial opening: Initial opening for the Variable Orifice T1-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-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 A-T initial opening: Initial opening for the Variable Orifice A-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.

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 return line connection.
A: Hydraulic conserving port associated with the actuator connection port.
B: Hydraulic conserving port associated with the actuator connection port.
S: Physical signal port to control spool displacement.