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Implementation of the

Digital Valve Interface (DVI)

NOTE: This technical note replaces the DVI manual, and includes all the information except a schematic

drawing. Call Valco if a copy of the schematic is required.

The Valco Digital Valve Interface (DVI) is an electronic controller which uses CMOS integrated circuitry

to convert low power logic level signals or contact closures into pneumatic pulses for the operation of

Valco two position air actuated valves. The DVI has two solenoids which correspond to the two posi-

tions of the actuator, with the output air supplied through the one which is activated. The input signal

determining which solenoid is activated may be sent manually with the toggle switch on the front panel,

or the DVI can be connected to a data system’s timed outputs for automated valve switching.

The input signal to the DVI causes the interface circuitry to provide a two second pulse to the designated

solenoid, driving the air actuator and valve to the indicated position. Upon removal of the first signal

and application of a second, a two second pulse from the other solenoid drives the actuator to the other

position. The result is that air pressure is applied to the actuator only during switching, eliminating the

possibility of side-loading, misalignment, or other problems which can arise when torque is continu-

ously applied to the valve. This “pulsed operation” procedure mimics valve switching by hand while

providing the advantages of powered, automated operation.

The DVI also has leads to connect a remote LED position readout, for situations in which its own LEDs

are out of sight inside an instrument or in a different building. In addition, two contact closures are

provided for signalling the time of sample injections or for starting other devices, such as a gradient

programmer or data system.

Installation

The Digital Valve Interface can be easily installed by the user with the following items supplied:

1. One plug-in transformer

2. One remote 10 pin flat cable (5 feet long) for interfacing with a data system

3. 5 feet of 1/8" plastic tubing for the air supply

4. The necessary fittings for air line installation

Mounting

Mounting dimensions are shown in Figure 1. The DVI features a two-sided face/mounting plate which

is factory-installed for mounting on the left side of the instrument panel. However, its design allows the

option of removing four screws and the hex nut on the switch and re-installing the plate for mounting on

the right side.

Technical Note 411

Valco Instruments Co. Inc.

1 2 3

Resumo do Conteúdo

Página 1 - Digital Valve Interface (DVI)

Implementation of theDigital Valve Interface (DVI)NOTE: This technical note replaces the DVI manual, and includes all the information except a schema

Página 2 - Automatic Operation

Basic Connections1. Connect the air lines between the DVI and the air actuator as shown in Figure 3 on the back page.2. Connect the air supply line to

Página 3 - Use of Remote LEDs

Operation by Remote Negative True Logic1. Connect the RED (logic ground) wire from the DVI to the logic ground of the timing device. (Consultits manu

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Vici DVI Manual do Utilizador

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Resumo do Conteúdo

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