Flowserve Positioner PMV D3 Series - D3XNU-D23PVA-Z5SX

The PMV D3 Series works as a digital positioner that uses a computer-optimized pneumatic relay with piezo-electric valves to control linear or rotary actuators. It receives a 4-20 mA input signal, which it converts to a position for the actuator, while its digital system uses internal electronics to control air pressure to achieve the desired valve position with minimal air consumption.

Core working principle

1. Input and processing: The positioner receives a 4-20 mA input signal, and a digital controller interprets this signal to determine the desired valve position.
2. Pneumatic control: The digital controller sends precise signals to piezo-electric valves within the pneumatic relay.
3. Actuator movement: The pneumatic relay then directs compressed air to either open or close the actuator to match the desired position. This includes controlling single-acting (spring return) or double-acting (air-to-open and air-to-close) actuators.
4. Feedback: The positioner uses position feedback (often a 4-20 mA signal) to confirm the actuator's actual position and make any necessary adjustments to ensure it matches the input command.
5. Low consumption: The "zero-bleed" pneumatic relay significantly reduces steady-state air consumption, leading to energy and cost savings.

Key features and functionality

• User interface: A large graphic display and five buttons allow for easy operation, configuration, and status monitoring without cryptic codes.
• Communication: It can communicate with a control system using protocols like HART, Profibus PA, or Foundation Fieldbus.
• Optional modules: Users can add modules for features like mechanical or proximity limit switches, mechanical feedback, and alarm functions.
• Diagnostics: Optional pressure sensors and ValveSight software can provide advanced diagnostics, allowing for proactive maintenance.

The D3's working principle

1. Digital input signal: The positioner receives a standard 4–20 mA input signal from a control system, such as a Distributed Control System (DCS). This signal represents the desired valve position (e.g., 4 mA = 0% open, 20 mA = 100% open).
2. Electronic control and comparison: The D3's internal electronics convert the analog input signal into a digital setpoint. A sophisticated internal algorithm continuously compares this digital setpoint to a feedback signal, which represents the actuator's actual position.
3. Piezoelectric control valves: Based on the comparison, the microprocessor drives an advanced pneumatic relay that uses piezoelectric valves.

• If the actual position is below the setpoint, the electronics command the valves to increase air pressure to the actuator.
• If the actual position is above the setpoint, the valves vent air from the actuator.

4. Low air consumption: The piezoelectric valves only consume air when the valve is in motion and are "zero-bleed" during steady-state operation. This significantly reduces air consumption and operating costs.
5. Actuator movement: The change in air pressure causes the actuator to move, which in turn moves the attached valve.
6. Position feedback: The positioner's split-spindle design is connected to a friction coupling that measures the actuator's rotation or linear travel. This provides the feedback signal to complete the control loop.
7. Auto-calibration: During setup, the D3 can automatically calibrate itself. By running a procedure and selecting the actuator type, the device will find the end stops and optimize its control parameters for the best performance.

Features and benefits of the D3 series

• Adaptable design:  Can be used on both linear and rotary actuators in single- or double-acting configurations.
  User interface: Features a local graphic display and five pushbuttons for simple, on-site configuration and status monitoring.
• Communication protocols: Supports various communication protocols, including HART, Profibus, and Foundation Fieldbus, for remote configuration and diagnostics.
• Advanced diagnostics: With the optional ValveSight software and integrated pressure sensors, the D3 offers predictive diagnostics to monitor valve health and predict maintenance issues.
• Customizable options: Offers optional plug-in modules for limit switches and 4–20 mA position feedback.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: PMV D3
• Product No. :  D3XNU-D23PVA-Z5SX
• D3X - Digital positioner with display and indicator, General purpose
• Connections: N - 1/4” NPT air, 1/2” NPT electrical
• Surface treatment: U - Powder epoxy
• Function: D - Double acting acting
• Spindle: 23 - Rotary VDI/VDE 3845
• Cover and Indicator (No indicator on D3E, D3F): PVA - Black PMV, 90 deg, Arrow indicator
• Sensors/Temperature/seals: Z -  No pressure sensors, NBR -30 to +80°C
• Input signal/protocol: 5 - HART, 4-20 mA
• Feedback option: S - Limit switches MEC + 4-20 mA + Alarm
• Accessories: X - No accessories

There are several Model of positioner, for more details read the PDF below 

Basic Ordering Information