Digital Valve Control Systems

Total Engineered Valve and Control Solution

The Digital Valve Controller is designed to provide a state-of-the-art valve controller with features to improve reliability and modernize current systems. The Digital Valve control System provides: Automatic Back-up Control Automated "Bumpless" Transfer Data on Valve Capacity / Port Opening Advanced Monitoring & Data Logging Event Logging Response time tests Partial stroke tests Thrust control Variable Configuration Health Monitoring

A comprehensive solution for all valve management needs. The Peerless DVC is compatible with:

• Single/Double Disc Slide Valves
• Plug Valves

Digital Valve Controller Features

Redundant Controllers and Power Supplies with Automatic Switchover

Each DVC supports an optional Backup controller. If the Primary controller can no longer position the valve, the Backup controller will automatically take over and restore operation.

User-friendly "Windows-like" Operator Interface

A 5.5-inch color, quarter VGA display provides a friendly "Windows-like" Graphical User Interface (GUI). The GUI interface is controlled via three pushbuttons and an optical shaft encoder (multi-function wheel) located on the front of the DVC. All embedded features of the DVC can be accessed and controlled via the front panel without the need for handheld devices, opening the controller enclosure, or connecting to a laptop computer.

Friendly user interface using... Pushbuttons List boxes Custom indicators and controls Important information is always visible, e.g.: Valve position, valve port open area, fault indicator

Ethernet, 4-20mA and Modbus Communications

The DVC supports Ethernet, 4-20mA and Modbus communications. Remote monitoring and troubleshooting of the DVC are available via an Ethernet communications link to a laptop or the control room. This feature works with a point-to-point connection, over a LAN or through the Internet.

Self-Diagnostics

Extensive hardware and software tests ensure proper operation and aid the operator in installing, positioning and troubleshooting the system.

Response Time Test Using the DVCmenu screen, an operator can select a Valve Time Response test in which the valve is dynamically stepped -5%, then +10% and then -5% back to its original position. As a result, a time response curve is generated which displays time vs. position and thrust valve vs. time during the test. Deviations from normal may reveal a defective valve or help predict future failures.

Software Based Setup

Using the DVC front panel GUI the operator can configure the DVC to suit a wide range of systems. For example, optional sensors can be individually enabled or disabled which allows the DVC to replace obsolete controllers with minimal changes to the system. As sensors are added they can be enabled without modifying the DVC hardware or software. All setup information is stored in flash memory within the DVC. Setup information can be transferred to a laptop for analysis, modification and storage. Stored setup files can be transferred to a DVC as part of initial setup, troubleshooting or recovery.

Software Based Calibration Using the front panel GUI the operator may calibrate all of the DVC's sensors and outputs. All calibration information is stored in flash memory within the DVC. Easily calibrate all analog inputs and outputs Calibrate without opening the controller enclosure Uses simple two-point linear calibration No hardware adjustments required (No potentiometers) Programmable analog ranges, valve control parameters, limits and set points

Enclosures

Hazardous locations, weather tight and purged enclosures available.

Event Logging/Fault Stacking The DVC typically stores an entire year's worth of events, including alarms, faults and operator actions in flash memory within the DVC. The time of occurrence and a description of the events are provided. Events can be viewed using the DVC front panel GUI. Stores up to 1 year's events with date and time stamp System Events Power up Backup enabled Operator Events Local control Change setup Set clock Fault Events / Fault Stack Alarms Failures Lists faults with date and time stamp Faults can be cleared

System Health Monitoring

A "Fault Stack" is provided for capturing failures. Failures are stored in the "Fault Stack" in the order that they occurred. After reviewing the failures the operator can clear the "Fault Stack". An indicator located on the front panel GUI changes from green to red to alert the operator of failures on the "Fault Stack".

Automated "Bumpless Transfer"

The DVC provides Automated "Bumpless Transfer" when transferring control from a remote source to local DVC control.

Additionally, the DVC provides a bumpless transfer when transferring control from the local DVC to a remote source by ensuring the control signals are the same before allowing the transfer.

Calculates Valve Capacity and Port Opening

Valve capacity and port opening are calculated using a 10 point piece-wise linear equation. When positioning the valve the operator provides the valve port opening at 10 predefined points of travel. This information is stored in flash memory.

Calculates Opening and Closing Thrust Values

Opening and closing thrust values are calculated and compared to limits to ensure safe operation. When positioning the valve the operator provides the valve cylinder parameters and operating limits. This information is stored in flash memory. A Thrust Limiting algorithm is included for Plug Valves to ensure that safe thrust levels are maintained during thermal expansion.

Supports Both English and Metric Units

The DVC GUI can be set to display values in English or Metric units.

Peerless Instrument History & Our Capabilities