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4-Way Directional Valve A

Configuration A of hydraulic continuous 4-way directional valve

Library

Directional Valves

Description

The 4-Way Directional Valve A block simulates a configuration of hydraulic continuous 4-way directional valve where the valve unloads the pump in neutral position. 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 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 T1-T ) and closes the orifices colored yellow (orifices A-T, P-B, and P-T1). As a result, the openings of the orifices are computed as follows:

where

hPAOrifice opening for the Variable Orifice P-A block
hPBOrifice opening for the Variable Orifice P-B block
hATOrifice opening for the Variable Orifice A-T block
hBTOrifice opening for the Variable Orifice B-T block
hPT1Orifice opening for the Variable Orifice P-T1 block
hT1TOrifice opening for the Variable Orifice T1-T block
hPA0Initial opening for the Variable Orifice P-A block
hPB0Initial opening for the Variable Orifice P-B block
hAT0Initial opening for the Variable Orifice A-T block
hBT0Initial opening for the Variable Orifice B-T block
hPT10Initial opening for the Variable Orifice P-T1 block
hT1T0Initial opening for the Variable Orifice T1-T block
xControl 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-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.

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-T1 initial opening

Initial opening for the Variable Orifice P-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.

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.

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