Control valves are used to control conditions such as flow, pressure, temperature and liquid level by fully or partially opening or closing in response to signals received from controllers.

Control valves can also work with the line media and controlled by Pilots. These types of valves are also known as Self Actuated Automatic Control Valves. The Pilots will respond to changes of pressure or flow and will open/close the valve. These valves do not require an external power source, meaning that the fluid pressure is enough to open and close the valve. Self Actuated Automatic control valves include: pressure reducing valves, flow control valves, back-pressure sustaining valves, level control valves, relief valves and solenoid valves, or a combination of these functions. An altitude valve controls the level of a tank. The altitude valve will remain open while the tank is not full and it will close when the tanks reaches its maximum level. The opening and closing of the valve requires no external power source (electric, pneumatic, or man power), it is done automatically, hence the name, automatic control valve.

If you would like more information on automatic control valves or want to know which kind of valve best suits your system, get in touch through our contact page.

Ultra range of Control Valves.

Ultra’s core business is Control Valves. In order to do justice to this strategy, large stocks are kept and a large workshop with the requisite number of staff to ensure prompt assembly service and the best possible before -and after sales service.

  • Ultra ACV Pilot operated Self Actuated. PN40 rated, large stocks up to 400mm, local manufacture in process
  • Ultra Ratio Reducing valve. Up to PN100 & DN250, large stocks
  • Maric Flow Control valve. Up to any size the system requires, large stocks, locally manufactured under license
  • C-Valve. Self actuated control valve with special features
  • Ultra V-Segment Ball Control Valve. Instrument control valve for all industries
  • Ultra Globe Control Valve. Instrument control valve for all industries

Download C-Valve Brochure

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Flow Control Valves

A flow control valve regulates the flow or pressure of a fluid (liquid or gas). Control valves normally respond to signals generated by independent devices such as a flow control meter or a temperature gauge. Control valves are normally fitted with actuators and positioners.

Level Control Valves

Level control valves are ideal for allowing normal forward flow to fill water reservoirs to a desired high level and where the pilot and valve of the reservoirs are easily accessible. The level control valve can function as a two position valve, either open or closed, or as a modulating control where the valve is allowed to open only to the point where it controls the level to always be at the same “full” point.

Pressure Reducing Valves

There are two types of water pressure reducing valves, direct acting and pilot operated; both of which use globe or angle style bodies, with new developments available in an Axial flow configuration. Valves used on smaller piping diameter units are normally cast from brass; while larger piping diameter units are made from ductile iron or steel.

Pressure Sustaining Valves

Pressure Sustaining and Relief valves do the same function depending on where and how they are installed in a system. They both control the pressure upstream of the valve.

Relief Valves

A relief valve is a type of valve used to control or limit the pressure in a system or vessel which can build up, leading to an instrument or equipment failure, or in extreme cases, even a fire.

Safety Shutdown Valves

A safety shut down valve (also known as an emergency shutdown valve, or ESD) is an actuated valve designed to stop the flow of a hazardous fluid or external hydrocarbons upon the detection of a dangerous event. This provides protection against possible harm to people, equipment or the environment, or the loss of fluid. Shutdown valves form part of a safety-instrumented system. The process of providing automated safety protection upon the detection of a hazardous event is called functional safety.