Flowserve Positioner PMV D2 Series - D2XNU-S23PVB-Z4X0X

The PMV D2 Series digital positioner works by using digital technology to precisely control a valve's actuator based on an input signal from a controller. It operates by receiving an electronic signal (e.g., 4-20 mA), comparing it to the actual valve position, and using a digital algorithm to move the actuator to the correct position. The process involves digital processing for precise control, and it includes features like automatic calibration and advanced diagnostics.

Working principle

1. Receiving input: The positioner receives an electronic control signal from a system controller, such as a 4-20 mA signal.
2. Measuring actual position: It uses internal feedback mechanisms, which can be a position feedback module or an optical indicator, to determine the current position of the valve.
3. Digital comparison and calculation: A digital processor compares the desired position (from the input signal) with the actual position. It then calculates the necessary adjustments to achieve the desired position with high precision.
4. Actuating the valve: Based on the digital calculation, the positioner sends a pneumatic signal to the actuator to move the valve to the correct position. For a single-acting positioner, this means it uses a built-in valve to control the air supply to the actuator.
5. Continuous adjustment: This process repeats continuously, allowing the positioner to make small, precise adjustments to maintain the valve's position against variations in pressure or load

Key features

• High precision: Offers very high control precision, even on small valves.
• Auto-calibration: Includes a one-button auto-calibration feature that tunes the positioner in seconds.
• Digital diagnostics: Features advanced digital diagnostics via the ValveSight software for monitoring valve health and performance.
• Modular design: Allows for flexible mounting for both rotary and linear actuators and supports various communication protocols like HART, Profibus PA, and Foundation Fieldbus.  
• Optional components: Can be optionally equipped with a 4-20 mA position feedback, limit switches, an LCD display (D22), or a dome indicator.

Core operating principle

The working principle of the D2 series can be broken down into four key components that work together in a feedback loop:

1. Input signal processing: The positioner receives a 4–20 mA electrical control signal from an external controller, such as a distributed control system (DCS).
2. Position sensing: The D2 uses an internal potentiometer connected to the actuator's shaft to measure the actual valve position. This gives the positioner real-time feedback on the valve's location.
3. Control logic: The positioner's microprocessor compares the input signal (the desired position) with the feedback signal (the actual position). Based on this comparison, it determines if the valve needs to move and in which direction.
4. Pneumatic output: The microprocessor sends a command to a pneumatic relay. This relay precisely regulates the flow of compressed air to and from the actuator.

• If the valve needs to open, the relay increases the air pressure to the actuator.
• If the valve needs to close, the relay decreases the air pressure.
• Once the desired position is reached, the relay stabilizes the pressure to hold the valve in place.

Key features enhancing performance

Several features of the D2 series further enhance its performance and ease of use:

• Auto-calibration: A key feature is its single-button auto-calibration, which automatically tunes the positioner to the valve and actuator assembly in seconds. This greatly simplifies commissioning.
• High precision and resolution: The digital control allows for very high precision, even for small valve movements. A high-resolution output ensures the actuator can be positioned accurately.
• HART communication: The D2 supports the Highway Addressable Remote Transducer (HART) protocol, which allows for two-way digital communication. This enables remote configuration, monitoring, and diagnostic capabilities from a central control system.
• Diagnostics: Advanced versions can be paired with software like ValveSight to provide predictive diagnostics. It continuously monitors the health of the entire valve assembly, including the actuator, and provides actionable insights to prevent unplanned shutdowns.
• Versatility: The positioner's modular design allows it to be used for both rotary and linear valve applications. It is also available in different configurations, such as single-acting and double-acting versions.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: PMV D2
• Product No. :  D2XNU-S23PVB-Z4X0X
• D2X - Digital, general purpose
• Connections: N - ¼" NPT air, 2 x ½" NPT electrical
• Surface treatment: U - Aluminium, powder paint
• Function: S - Single acting
• Mounting options/Spindle: 23 - Rotary,VDI/VDE 3845
• Cover/I indicator: PVB - Black, no indicator
• Temperature/Seals: Z -  Nitrile, Standard –20° to +80°C (–4 to° +178°F)
• Input signal/protocol: 4 - 4–20 mA / none
• Feedback option: X - No feedback option
• Options: 0 - No option
• Accessories: X - No accessories

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

Basic Ordering Information 

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 

Flowserve Positioner PMV D3 Series - D3XNU-K23PVA-Z4TX

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-K23PVA-Z4TX
• 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: K - Double acting Fail Freeze function
• 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: 4 - 4-20 mA
• Feedback option: T - 4-20 mA transmitter only + Alarm
• Accessories: X - No accessories

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

Basic Ordering Information 

Flowserve Positioner PMV D20 Series - D20DNU-S23PVA-Z5X0X

The PMV D20 digital positioner uses a digital control algorithm to precisely position a valve by using a piezo-driven valve and hall sensor. The positioner receives a control signal (\(4-20mA\)) and compares it to the actual valve position, which is detected by a hall sensor, and then sends a signal to a piezo-driven poppet to control the air supply to the actuator, moving the valve to the desired position. Its process is characterized by an auto-calibration feature and built-in diagnostics for reliable and precise control. 

Working principle

1. Input and Feedback: The positioner receives a \(4-20mA\) input signal, which tells it the desired valve position. A hall sensor detects the current position of the valve and sends this information back to the positioner's internal processor. 
2. Digital Processing: The processor uses a digital control algorithm to compare the desired position signal with the actual position feedback signal. 
3. Air Control: Based on the difference between the two signals, the processor sends a precise signal to a piezo-driven poppet. This poppet controls the flow of pneumatic air to the actuator, moving it to the required position. 
4. Auto-Calibration: The D20 can perform a rapid auto-calibration with a single button press to quickly tune itself to the valve's characteristics. 
5. Diagnostics: The positioner includes self-diagnostics to monitor its performance and alert the user to potential issues before they cause a proble.

Key features

• High Precision: Offers precise control, even on the smallest valves. 
• Modularity: Can be equipped with optional modules for limit switches and position feedback (\(4-20mA\)). 
• Communication: Available with various communication protocols, including HART, Profibus PA, and Foundation Fieldbus, for advanced diagnostics and integration into control systems. 
• Diagnostics: Features ValveSight DTM predictive diagnostics to monitor valve health and provide alerts. 

Key operating components

• Electronic controller: A plant's distributed control system (DCS) or other controller sends a variable input signal, typically 4–20 mA, to the D20. This signal represents the desired valve position (e.g., 50% open).
• Proportional solenoid: The D20's internal solenoid receives the variable current signal. The strength of the solenoid's electromagnetic field is directly proportional to the strength of the input signal.
• Pneumatic relay and actuator: The solenoid's force adjusts the pneumatic relay, which then regulates the air pressure sent to the valve's actuator. This causes the actuator to move the valve's stem to the commanded position.
• Feedback loop: To ensure extreme accuracy, the D20 measures the valve's actual position via a mechanical linkage to the valve stem. This feedback is constantly compared against the initial command signal. If there is any discrepancy, the D20 adjusts the air pressure to the actuator until the valve is in the correct position.

Operating principle step-by-step

1. Signal reception: The PMV D20 receives a continuous electronic control signal (e.g., 12 mA) from a central control system, indicating a precise valve position is needed.
2. Solenoid action: The proportional solenoid inside the D20 uses the 12 mA signal to generate a specific magnetic force.
3. Pressure modulation: This force modulates the pneumatic relay, causing it to increase or decrease the air pressure flowing from the air supply to the actuator.
4. Actuator movement: The change in air pressure moves the actuator, which, in turn, moves the valve's stem to a new position.
5. Position feedback: The D20's mechanical linkage tracks the movement of the valve stem and provides a real-time position reading.
6. Correction for precision: The digital processor inside the D20 compares the real-time position with the desired position from the original 12 mA signal. If there is any error, the D20 makes instant, minor adjustments to the air pressure to correct it, achieving very high control precision.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: PMV D20
• Product No. :  D20DNU-S23PVA-Z5X0X
• D20 - Digital compact positioner, Single button interface, LED status
• Approval, certificate: D - General purpose version
• Connections air, electrical: N - 1/4" NPT air, 1/2" NPT electrical x 2
• Housing/Surface treatment: U - Aluminium/Powder epoxy, black
• Function: S - Single acting
• Mounting options / Spindle: 23 - VDI/VDE 3845 rotary, Mounting kit not included
• Cover and indicator: PVA - PMV, black cover, arrow indicator
• Temperature/seals: Z -  Standard -20°C to 85°C (-4°F to 185°F)
• Input signal/protocol: 5 - 4-20 mA, / HART
• Feedback option, switches: X - No feedback option
• Accessories: X - No accessories

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

Basic Ordering Information 

Flowserve Positioner PMV D20 Series - D20DMU S23PVA-Z4X0X 

The PMV D20 digital positioner uses a digital control algorithm to precisely position a valve by using a piezo-driven valve and hall sensor. The positioner receives a control signal (\(4-20mA\)) and compares it to the actual valve position, which is detected by a hall sensor, and then sends a signal to a piezo-driven poppet to control the air supply to the actuator, moving the valve to the desired position. Its process is characterized by an auto-calibration feature and built-in diagnostics for reliable and precise control. 

Working principle

1. Input and Feedback: The positioner receives a \(4-20mA\) input signal, which tells it the desired valve position. A hall sensor detects the current position of the valve and sends this information back to the positioner's internal processor. 
2. Digital Processing: The processor uses a digital control algorithm to compare the desired position signal with the actual position feedback signal. 
3. Air Control: Based on the difference between the two signals, the processor sends a precise signal to a piezo-driven poppet. This poppet controls the flow of pneumatic air to the actuator, moving it to the required position. 
4. Auto-Calibration: The D20 can perform a rapid auto-calibration with a single button press to quickly tune itself to the valve's characteristics. 
5. Diagnostics: The positioner includes self-diagnostics to monitor its performance and alert the user to potential issues before they cause a proble.

Key features

• High Precision: Offers precise control, even on the smallest valves. 
• Modularity: Can be equipped with optional modules for limit switches and position feedback (\(4-20mA\)). 
• Communication: Available with various communication protocols, including HART, Profibus PA, and Foundation Fieldbus, for advanced diagnostics and integration into control systems. 
• Diagnostics: Features ValveSight DTM predictive diagnostics to monitor valve health and provide alerts. 

Key operating components

• Electronic controller: A plant's distributed control system (DCS) or other controller sends a variable input signal, typically 4–20 mA, to the D20. This signal represents the desired valve position (e.g., 50% open).
• Proportional solenoid: The D20's internal solenoid receives the variable current signal. The strength of the solenoid's electromagnetic field is directly proportional to the strength of the input signal.
• Pneumatic relay and actuator: The solenoid's force adjusts the pneumatic relay, which then regulates the air pressure sent to the valve's actuator. This causes the actuator to move the valve's stem to the commanded position.
• Feedback loop: To ensure extreme accuracy, the D20 measures the valve's actual position via a mechanical linkage to the valve stem. This feedback is constantly compared against the initial command signal. If there is any discrepancy, the D20 adjusts the air pressure to the actuator until the valve is in the correct position.

Operating principle step-by-step

1. Signal reception: The PMV D20 receives a continuous electronic control signal (e.g., 12 mA) from a central control system, indicating a precise valve position is needed.
2. Solenoid action: The proportional solenoid inside the D20 uses the 12 mA signal to generate a specific magnetic force.
3. Pressure modulation: This force modulates the pneumatic relay, causing it to increase or decrease the air pressure flowing from the air supply to the actuator.
4. Actuator movement: The change in air pressure moves the actuator, which, in turn, moves the valve's stem to a new position.
5. Position feedback: The D20's mechanical linkage tracks the movement of the valve stem and provides a real-time position reading.
6. Correction for precision: The digital processor inside the D20 compares the real-time position with the desired position from the original 12 mA signal. If there is any error, the D20 makes instant, minor adjustments to the air pressure to correct it, achieving very high control precision.

 Full Datasheet

Positioner Transmitter Feature  

• Manufacturer: PMV D20
• Product No. :  D20DMU S23PVA-Z4X0X
• D20 - Digital compact positioner, Single button interface, LED status
• Approval, certificate: D - General purpose version
• Connections air, electrical: M - ¼ in. NPT air, M20x1.5 electrical
• Housing/Surface treatment: U - Aluminium/Powder epoxy, black
• Function: S - Single acting
• Mounting options/shaft: 23 - VDI/VDE 3845 rotary, mounting kit not included
• Cover and indicator: PVA - PMV, black cover, arrow indicator
• Temperature/seals: Z -  Standard -20°C to 85°C (-4°F to 185°F)
• Input signal/protocol: 4 - 4-20 mA/none
• Feedback option, switches: X - No feedback option
• Accessories: X - No accessories

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

Basic Ordering Information