Control Valves

Curtiss-Wright Valves Division carries a range of control valves through its product brands; Phönix and Daume Regelarmaturen. The valves have a variety of possible applications including; power plants, petrochemical plants and railway tankers.

 

A Control Valve controls fluid flow by altering the size of the flow passage from a controller, altering the flow rate and the process quantities such as pressure, temperature and liquid level. Amongst those available at Curtiss Wright are; 

 

  • Feedwater Control Valves for industrial applications, 
  • 3-Way-Valve with encapsulated super-long bellows and emergency gland or with stuffing box seal
  • Oxygen control valves with a straight pattern body suitable for use in steelworks and piping

View our full range of Control Valves below:


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Daume Regelarmaturen Phönix


Control Valves: Purpose & Functionality

A Control Valve alters the flow rate by changing the size of the flow passage from a controller influencing quantities of gas or liquid to have an impact on pressure, temperature and liquid level.

Depending on the type of valve chosen, the limiting mechanism is moved by an electrical, mechanical, pneumatic or hydraulic actuator. The valve regulates the flow of movement through a valve plug. The plug is attached to a valve stem which in turn is connected to the actuator. 


Typical Control Valve Usage

Processing plants consist of hundreds of control loops that are networked together in order to produce a certain product. Each loop is designed to control certain variables such as pressure, temperature, flow or level within a required range. 

However, each loop receives and internally creates disturbances, affecting the process variable and interaction from other loops within the network, which can have a cumulative effect when multiple loops are connected. In an effort to reduce the disturbances, sensors and transmitters are used to collect information. Controllers then process the information and decide the best way to get the process variable back to where it should be. 

Once all of the calculating, comparing and measuring has taken place, a type of control element must then implement the strategy which has been selected by the controller, using the valves to alter pressure within the system, compensating for any noise or disturbances and allowing the system to return to a desired state of pressure, flow or temperature.


Examples Of Control Valves Available 

Feedwater Control Valves - Industrial applications for high pressure and temperature service environments such as Power Plants and Petrochemical Plants:

3-Way-Valve - With encapsulated super-long bellows and emergency gland or with stuffing box seal - Suitable for toxic or flammable gases and liquids.

Oxygen Control Valves - with a straight pattern body- Suitable for steelworks and piping. 


Control Valves: Applications

The use of control valves in power plants

A power plant uses hundreds of valves to control every aspect of its operation. The control valves are critical for optimizing the power plants efficiency can often be exposed to high temperatures and abrasive chemicals.

With the ever-increasing demand for sourcing renewable power and curbing carbon emissions, producing high quality manufactured valves is more important than ever. 

Curtiss-Wright have developed innovative control valves that can withstand high environmental demands while remaining cost-effective. Our valves can support throttle accurately, increasing performance for critical power plant operations.

Control valves in petrochemical plants

The petroleum industry is best known for its global exploration and extraction of oil. However, it’s applications are not just limited to oil or gas. Petrochemical plants also manufacture plastics, dyes, food additives and other petrochemicals that derive from natural gas, coal or oil. 

Due to the extreme temperatures and pressures needed to produces the materials, high-quality engineering is essential to the operation of petrochemical plants. 

Control valves are critical to the performance of the system. Chemicals used in this industry can be hazardous to the surrounding environment and people, making system regulation essential.


Different types of Valves

At Curtiss Wright, we offer an extensive range of valves, including:

 

 

For more information on any of our products and services, please read the related documents found in the library or complete a contact form here.


FAQ

What is a control valve used for?

A control valve is designed to control flow rate, pressure, level or temperature, depending on the desired set point and application.  The valve includes a plug or disk, and the position of the plug can be changed by an actuator, to allow fluid or gases through. 

Control valves are used in applications including: 

  • Power plants
  • Petrochemical plants
  • Railway tankers

How does a control valve work?

Manufacturing plants contain numerous control loops, running at the same time and interacting with each other based on instruction from sensors. Control valves play a crucial part in the quality control process. 

 

Process example:
  1. A controller picks up on any disturbances in the production line.
  2. The controller creates a strategy to regulate variables back to the required setpoint before the disturbance.
  3. Control valves are put in place to carry out the strategy set.
  4. The production line returns back to full working order.

What is a pressure control valve?

Pressure control valves are primarily used in hydraulic systems, assisting in a variety of functions and are designed to monitor and regulate pressure, either manually or electronically. 

 

Types of pressure valves include:   

  • Relief
  • Unloading
  • Reducing
  • Sequence
  • Counterbalance