Valve Positioners South Africa

Industrial Valve Positioners, Smart Positioners & Electro-Pneumatic Positioners

TOSOG supplies valve positioners in South Africa for industrial automation, process control and pneumatic valve applications. We source and supply smart valve positioners, digital valve positioners, electro-pneumatic valve positioners, pneumatic valve positioners and valve position transmitters for a wide range of control valves and actuators.

Our valve positioner solutions are suitable for mining, mineral processing, water and wastewater treatment, power generation, manufacturing, chemical processing, petrochemical plants, food processing, agriculture and general industrial automation.

Whether you require a replacement control valve positioner, a smart positioner for a new installation, or a positioner for an existing pneumatic actuator, TOSOG can assist with product selection and sourcing according to your valve, actuator, signal and application requirements.

Looking for valve positioners in South Africa? Contact TOSOG for a quotation and technical assistance.

What Is a Valve Positioner?

A valve positioner is an instrumentation device used to control and accurately position an actuated control valve.

The positioner receives a control signal from a PLC, DCS, SCADA system or other process-control system and adjusts the pneumatic actuator so that the valve reaches the required position.

For example, a 4–20 mA control signal can command a valve to move proportionally between its minimum and maximum positions.

A valve positioner can improve:

Valve positioning accuracy
Process control
Response time
Control valve stability
Repeatability
Actuator performance
Process efficiency
Diagnostic capability
Maintenance planning

Modern smart valve positioners can also provide diagnostics, configuration, feedback and communication through protocols such as HART, FOUNDATION Fieldbus or PROFIBUS, depending on the model.

Valve Positioners We Supply in South Africa

TOSOG can source a broad range of industrial valve positioners and related valve automation equipment.

Our valve positioner range includes:

Smart valve positioners
Digital valve positioners
Pneumatic valve positioners
Electro-pneumatic valve positioners
I/P valve positioners
Control valve positioners
Rotary valve positioners
Linear valve positioners
Single-acting valve positioners
Double-acting valve positioners
HART valve positioners
PROFIBUS valve positioners
FOUNDATION Fieldbus positioners
Explosion-proof valve positioners
Intrinsically safe valve positioners
Valve position transmitters
Remote-mounted valve positioners
Valve positioner accessories
Positioner mounting kits
Feedback modules
Limit switches
I/P converters
Pneumatic boosters
Air filter regulators

TOSOG also supplies associated control valves, pneumatic actuators, electric actuators, solenoid valves, valve accessories and industrial instrumentation.

Smart Valve Positioners

A smart valve positioner uses electronic and microprocessor-based technology to improve valve control, commissioning and diagnostics.

Smart positioners can provide functions such as:

Automatic calibration
Valve position feedback
Self-diagnostics
HART communication
Digital configuration
Valve performance monitoring
Alarm functions
Partial Stroke Testing (PST)
Fail-safe functions
Travel monitoring
Position transmitter functions
Predictive maintenance information

For demanding industrial applications, a digital valve positioner can provide substantially more information than a conventional pneumatic or electro-pneumatic positioner.

For example, Siemens describes the SIPART PS2 as a smart electropneumatic positioner with automatic calibration, diagnostics and multiple communication options including 4–20 mA, HART, PROFIBUS PA and FOUNDATION Fieldbus.

Electro-Pneumatic Valve Positioners

An electro-pneumatic valve positioner converts an electrical control signal into pneumatic actuator movement.

The most common control signal is:

4–20 mA

The positioner compares the desired valve position with the actual valve position and adjusts pneumatic output pressure accordingly.

Electro-pneumatic valve positioners are widely used on:

Control valves
Globe valves
Butterfly valves
Ball valves
Rotary valves
Linear valves
Pneumatic actuators
Process control systems

South African positioner manufacturers and suppliers offer conventional electro-pneumatic and pneumatic-pneumatic positioners for both linear and rotary applications.

Pneumatic Valve Positioners

A pneumatic valve positioner uses a pneumatic control signal to regulate actuator position.

Typical applications include industrial processes where pneumatic instrumentation is preferred or where existing control systems use pneumatic signals.

Common signal ranges include:

3–15 psi
20–100 kPa

Pneumatic positioners remain useful in applications requiring simple, robust and reliable valve control.

Digital Valve Positioners

Digital valve positioners combine electronic control, valve feedback and software-based configuration.

Depending on the manufacturer and model, features can include:

4–20 mA input
HART communication
Digital diagnostics
Automatic setup
Valve signature testing
Position feedback
Alarm monitoring
Partial stroke testing
Remote configuration
Event logging
Predictive maintenance

For example, Fisher FIELDVUE digital valve controllers such as the DVC6200 provide HART communication, diagnostics and valve-performance monitoring.

Valve Positioner Models

TOSOG can source valve positioners from leading international manufacturers according to availability, application and technical specification.

Siemens Valve Positioners

Siemens SIPART PS2

The Siemens SIPART PS2 is a widely used smart electropneumatic valve positioner for pneumatic linear and part-turn actuators.

Features can include:

4–20 mA
HART
PROFIBUS PA
FOUNDATION Fieldbus
Automatic calibration
Valve diagnostics
Partial Stroke Test
Position feedback
Fail-safe functions
IP66 / NEMA 4X options
Hazardous-area options

Siemens documentation identifies SIPART PS2 configurations for both linear and part-turn pneumatic actuators, including single- and double-acting applications.

Siemens SIPART PS100

The SIPART PS100 is another Siemens digital positioner platform for industrial valve automation.

Emerson Fisher Valve Positioners

Fisher FIELDVUE DVC6200

The Fisher FIELDVUE DVC6200 Digital Valve Controller is designed for accurate control and online valve-performance diagnostics.

Key capabilities include:

HART communication
Digital valve control
Valve diagnostics
Non-contact feedback
Self-diagnostics
Modular design
Performance monitoring
Precise valve positioning

Emerson also offers the DVC6200f FOUNDATION Fieldbus version and other FIELDVUE digital valve controller variants.

Fisher FIELDVUE DVC7K

The DVC7K is a newer generation FIELDVUE digital valve controller platform with advanced valve-health analytics.

Samson Valve Positioners

TOSOG can source SAMSON valve positioners for industrial process-control applications, including digital and electro-pneumatic configurations.

Common SAMSON positioner families include:

SAMSON 3730 Series
SAMSON 3731 Series
SAMSON 3767 Series
SAMSON TROVIS positioner solutions

These positioners can be configured according to the actuator, valve, communication protocol and hazardous-area requirements.

ABB Valve Positioners

ABB valve automation products can include intelligent digital positioners for control valves and pneumatic actuators.

Commonly requested ABB positioner families include:

ABB TZIDC
ABB TZIDC-200
ABB position feedback solutions

ABB positioners are commonly considered for applications requiring intelligent valve control, diagnostics and digital communication.

Metso / Neles Valve Positioners

TOSOG can also source Metso / Neles valve automation and positioner solutions for process industries.

Common product families include:

Neles ND9000 Series
Neles intelligent valve controllers
Metso valve automation solutions

These solutions are suitable for demanding process applications where accurate control and diagnostics are important.

Yokogawa Valve Positioners

Yokogawa valve automation products include digital valve positioner solutions for process-control applications.

Potential applications include:

Oil & gas
Petrochemical
Chemical processing
Power generation
Water treatment
Mining
Manufacturing

Other Valve Positioner Brands

Depending on your application and availability, TOSOG can source valve positioners from various international manufacturers and technology suppliers.

Brands may include:

Siemens
Emerson Fisher
SAMSON
ABB
Metso / Neles
Yokogawa
Azbil
Schneider Electric / Foxboro
Rotork
PMV
PCT Engineering
Mitech
Proval
DCM
Other OEM and aftermarket manufacturers

South Africa’s industrial instrumentation market includes suppliers and manufacturers covering valve positioners from brands such as ABB, Siemens, Valmet, Emerson, Yokogawa and others.

Popular Valve Positioner Models

Manufacturer	Model / Series	Type
Siemens	SIPART PS2	Smart electropneumatic
Siemens	SIPART PS100	Digital
Emerson Fisher	FIELDVUE DVC6200	Digital
Emerson Fisher	FIELDVUE DVC6200f	FOUNDATION Fieldbus
Emerson Fisher	FIELDVUE DVC7K	Digital
SAMSON	3730 Series	Smart electropneumatic
SAMSON	3731 Series	Smart positioner
ABB	TZIDC	Digital positioner
Metso / Neles	ND9000	Intelligent valve controller
Yokogawa	YVP Series	Digital valve positioner
Azbil	AVP Series	Smart valve positioner
PMV	D3	Digital positioner
PMV	D20	Compact digital positioner
PMV	D30	Intelligent positioner
PMV	P5 / EP5	Pneumatic / electro-pneumatic
PCT	Type 2000	Pneumatic / electro-pneumatic
Proval	VP6	Electro-pneumatic
Proval	VP7/72	Smart positioner
Proval	VP8/82/85	Smart positioner
Proval	VP9	Smart positioner
DCM	SS2	Rotary smart digital positioner

South African suppliers currently list models such as PMV D3, D20, D30, P5/EP5 and Arca Arcapro 827, while Proval lists VP6, VP7/72, VP8/82/85 and VP9 positioners.

Valve Positioner Applications

TOSOG supplies valve positioner solutions for a wide range of industries.

Mining

Valve positioners are used in:

Mineral processing plants
Slurry applications
Flotation plants
Water systems
Pump stations
Compressed-air systems
Process control
Chemical dosing
Tailings systems

Water & Wastewater

Applications include:

Water treatment plants
Wastewater treatment
Pump stations
Reservoirs
Filtration systems
Chemical dosing
Pressure control
Flow control

Power Generation

Valve positioners can be used on:

Steam control valves
Feedwater systems
Cooling systems
Boiler systems
Turbine auxiliary systems
Condensate systems
Fuel systems

Manufacturing

Applications include:

Process lines
Steam systems
Compressed air
Cooling systems
Heating systems
Chemical dosing
Production automation

Chemical & Petrochemical

Valve positioners are used where accurate modulation of process valves is required.

Applications can include:

Flow control
Pressure control
Temperature control
Level control
Chemical dosing
Process isolation and regulation

Rotary vs Linear Valve Positioners

Choosing the correct positioner depends on the valve and actuator design.

Linear Valve Positioner

Used with actuators that move the valve stem in a linear direction.

Typical applications include:

Globe control valves
Linear control valves
Diaphragm actuators
Linear pneumatic actuators

Rotary Valve Positioner

Used with rotary actuators.

Typical applications include:

Butterfly valves
Ball valves
Plug valves
Rotary control valves

Some modern positioners support both linear and rotary applications with the appropriate mounting hardware.

Single-Acting vs Double-Acting Positioners

Single-Acting

A single-acting pneumatic actuator normally uses air pressure in one direction with a spring providing the return movement.

Common fail positions include:

Fail open
Fail closed

Double-Acting

A double-acting actuator uses pneumatic pressure to drive the actuator in both directions.

Double-acting positioners can therefore control both actuator chambers.

Selecting the correct configuration is essential when replacing a valve positioner.

Why Use a Valve Positioner?

A properly selected valve positioner can provide:

Improved Control Accuracy

The positioner helps the actuator achieve the commanded valve position.

Faster Response

The positioner can improve actuator response to changes in the control signal.

Reduced Hunting

Smart positioners can optimise valve movement and reduce unnecessary cycling.

Better Diagnostics

Digital positioners can identify certain valve, actuator and instrumentation problems before they become major failures.

Improved Maintenance

Diagnostic information can help maintenance teams plan interventions instead of relying only on emergency repairs.

Process Optimisation

Accurate valve control can contribute to better flow, pressure, temperature and level regulation.

How to Select the Correct Valve Positioner

Before ordering a valve positioner in South Africa, provide as much technical information as possible.

1. Valve Manufacturer

Provide the valve manufacturer and model.

2. Valve Type

Specify whether it is:

Globe
Butterfly
Ball
Plug
Control valve
Other

3. Actuator Manufacturer

Provide the pneumatic actuator manufacturer and model.

4. Actuator Type

Specify:

Single acting
Double acting

5. Control Signal

Common signals include:

4–20 mA
3–15 psi
20–100 kPa
HART
PROFIBUS
FOUNDATION Fieldbus

6. Valve Travel

Provide:

Linear stroke in mm
Rotary angle in degrees

7. Air Supply

Provide the available instrument-air pressure.

8. Hazardous Area Classification

If applicable, specify:

Ex ia
Ex d
ATEX
IECEx
Other required certification

9. Communication Protocol

If required, specify:

HART
PROFIBUS PA
FOUNDATION Fieldbus
Bluetooth
Other protocol

10. Existing Positioner

The easiest way to identify a replacement is often to provide:

A photograph of the existing valve positioner + nameplate + part/model number.

Tips When Buying Valve Positioners in South Africa

Tip 1 – Do Not Select Only by Valve Size

A positioner is matched primarily to the actuator and valve movement, signal and application—not simply the valve’s pipe diameter.

Tip 2 – Check the Actuator

Confirm the actuator type, manufacturer, spring range, air supply and mounting arrangement.

Tip 3 – Check the Signal

A 4–20 mA positioner is not automatically interchangeable with every pneumatic positioner.

Tip 4 – Confirm Single or Double Acting

This is one of the most important configuration requirements.

Tip 5 – Check Hazardous-Area Requirements

For mining, petrochemical, chemical and other hazardous environments, verify the required Ex certification before ordering.

Tip 6 – Consider Smart Diagnostics

For critical process valves, a smart positioner with diagnostics can provide valuable information for maintenance and reliability teams.

Tip 7 – Confirm Communication

If your PLC, DCS or SCADA system requires HART, PROFIBUS or FOUNDATION Fieldbus, specify this before quotation.

Tip 8 – Send the Existing Nameplate

A photograph of the existing positioner can significantly reduce the risk of supplying an incorrect replacement.

Tip 9 – Check Mounting

Verify NAMUR, IEC or manufacturer-specific mounting requirements.

Tip 10 – Specify the Environment

Tell us if the positioner will operate in:

High temperatures
High vibration
Dust
Corrosive environments
Wet environments
Hazardous areas
Outdoor installations

Valve Positioner Replacement

TOSOG can assist with sourcing replacement valve positioners for obsolete, damaged or discontinued units.

For a replacement enquiry, send:

1. Existing positioner photograph
2. Nameplate photograph
3. Manufacturer
4. Model number
5. Part number
6. Valve manufacturer/model
7. Actuator manufacturer/model
8. Required quantity
9. Delivery location in South Africa

Our technical team can then identify a suitable OEM, equivalent or aftermarket valve positioner, subject to technical compatibility.

Valve Positioner Suppliers South Africa

TOSOG Yellow Plant Solutions supplies industrial automation and instrumentation equipment to customers throughout South Africa.

We can assist customers looking for:

Valve positioners Johannesburg
Valve positioners Gauteng
Valve positioners Cape Town
Valve positioners Durban
Valve positioners Pretoria
Valve positioners Richards Bay
Valve positioners Rustenburg
Valve positioners Mpumalanga
Valve positioners Limpopo
Valve positioners KwaZulu-Natal
Valve positioners Western Cape
Valve positioners Eastern Cape

Our supply network allows us to source specialist instrumentation where a specific model is not locally available.

Why Choose TOSOG?

TOSOG Yellow Plant Solutions provides sourcing and supply solutions for industrial automation, instrumentation and heavy equipment requirements.

We offer:

Industrial automation equipment
Valve positioners
Control valves
Pneumatic actuators
Solenoid valves
PLC systems
SCADA systems
HMI systems
Industrial sensors
Pressure transmitters
Flow meters
Level sensors
Temperature instrumentation
Electrical and electronic components
Mining equipment parts

We can source equipment according to your OEM part number, model number, technical specification or application requirement.

Frequently Asked Questions – Valve Positioners

What is a valve positioner?

A valve positioner is a control device that regulates pneumatic actuator pressure so that a control valve reaches the desired position accurately.

What is the most common valve positioner signal?

A 4–20 mA signal is one of the most widely used electrical control signals for industrial valve positioners.

What is a smart valve positioner?

A smart valve positioner uses microprocessor-based electronics to control valve position and can provide functions such as automatic calibration, diagnostics, communication and valve-performance monitoring.

What is an electro-pneumatic valve positioner?

An electro-pneumatic valve positioner receives an electrical control signal, commonly 4–20 mA, and converts it into pneumatic output to control the valve actuator.

What is the difference between a pneumatic and electro-pneumatic positioner?

A pneumatic positioner uses a pneumatic control signal, while an electro-pneumatic positioner uses an electrical signal such as 4–20 mA and produces pneumatic actuator output.

Can a valve positioner work with a butterfly valve?

Yes. Many positioners are designed for rotary actuators commonly used with butterfly valves.

Can a valve positioner work with a ball valve?

Yes. Positioners can be used with ball valves equipped with compatible pneumatic rotary actuators.

What is HART on a valve positioner?

HART is a digital communication protocol that can operate over a conventional 4–20 mA signal and allows configuration, diagnostics and additional device information to be communicated.

What is a digital valve positioner?

A digital valve positioner uses electronic processing and feedback to control valve position and can provide advanced configuration and diagnostic functions.

What information do you need to quote a valve positioner?

Ideally, provide the manufacturer, model number, part number, valve type, actuator type, control signal, air supply, stroke/rotation, hazardous-area requirements and communication protocol.

A photograph of the existing positioner and nameplate is highly recommended.

Can TOSOG supply valve positioners anywhere in South Africa?

Yes. TOSOG supplies industrial equipment to customers across South Africa, subject to product availability and delivery arrangements.

Can you supply an alternative to an obsolete valve positioner?

Yes. Where technically suitable, TOSOG can investigate OEM replacement, equivalent or aftermarket alternatives.

Do you supply valve positioner accessories?

Yes. Depending on the application, accessories may include mounting kits, feedback modules, limit switches, boosters, regulators and related valve automation components.

Request a Valve Positioner Quote

Looking for a valve positioner supplier in South Africa?

Contact TOSOG Yellow Plant Solutions for assistance with sourcing the correct valve positioner for your application.

Send us your:

Valve model + actuator model + existing positioner model/part number + photograph + quantity + delivery location.

We can assist with smart valve positioners, digital valve positioners, pneumatic positioners, electro-pneumatic positioners and control valve automation solutions.

TOSOG Yellow Plant Solutions – Industrial Automation & Valve Positioners South Africa.