Tag: control valves

Applications and Working process of Control Valve


A valve is a device that regulates the fluid flow as well as the pressure within a system or process. Unlike on-off valves, a control valve is used to regulate the fluid flow by stopping and starting the fluid flow as per the direction is given by the controller.

Control Valve

Control valves consist of three main parts: the valve, the actuator, and the controller. Various components of the Actuator include rain cap, eye bolt, diaphragm, spring, actuator stem, diaphragm case, scale plate, stem connector, and yoke.

The components of body part include packing flange, packing follower, yoke claim nut, gland packing, valve stem, bonnet, stud bolt and nut, gasket, guide ring, guide bushing, valve plug, seat ring, valve body, trim set, and positioner.

Though the primary purpose of a control valve is to regulate the fluid flow, there are two main forms of action i.e. the sliding stem and the rotary action. The most common type of control valves in the sliding stem include globe valve, angle body valve, and angle seat piston valve while the rotary action includes a butterfly valve and ball valve.

Why Control Valves are Used?

Control valves are used for various purposes in the industrial, engineering, manufacturing, and scientific communities. The primary purpose of a control valve is to regulate the rate of the fluid flow by varying the size of the flow passage. Control valves are most commonly used for consequential control of process quantities including pressure, temperature, and the liquid level.

How do Control Valves work?

With the help of opening and closing internal passages, control valves regulate the fluid flow. Control valves form a control loop which is then used by a controller to send signals. Control valves respond to these signals and adjust the internal openings accordingly.

Control valves use the actuator to move the valve stem. Usually, it is either air (pneumatically) or electrically driven. The pressure between the inlet and outlet decides the rate of flow through the valve.

In order to reduce the fluid flow, the valve is closed, which results in more back-pressure and increases the difference between the inlet and outlet pressures.

Control valves help in controlling the fluid flow and are used in various industries including pipeline, oil & gas, food & beverage, the biopharma industry, and marine industry.

SKG PNEUMATICS INC is the top industrial valve suppliers and they are also the leading control valve suppliers in India. All their products are tested for resilient durability to provide the best industrial valve to their customers.

Types of Valves in Gas and Oil Industry

In a piping system, valves play a very important role. They are the most essential components of the oil and gas industry and are used in various purposes. In upstream, midstream and downstream, valves are used for controlling the flow, protecting the equipment and refining of crude oil respectively. In this post, we shall discuss the types of valves used in the gas and oil industry.

Following are the most common types of valves used in the gas and oil industry:

  1. Control Valves: 

    As it is clear from the name that control valves are used to control the flow Based on the process conditions. A control valve is termed as a final control element in automatic control terminology. There are two main parts of control valve i.e. the sliding stem and the rotary action.

  2. Bellow Seal Valve:   

    Bellow seal valve is a kind of control valve which is used in balancing the pressure of the fluid. For pipelines of steam and flammable, explosive media, bellow seal valve is the perfect solution. By adopting the structure with bellows, it helps in avoiding the leakage of the valve stem. It is very secure and prevents the loss of fluids. It has a very long operating life with minimum operating cost. The structure of bellow seal valve is durable which helps in preventing leakage.

  3. Butterfly Valves:   

    Butterfly valve is used to stop, regulate and start the flow. It has a very vast use in oil and gas industry. It is a quarter- turn rotary motion valve which means that rotating the handle of the valve at 90° can completely close or start it.

  4. Cryogenic Valves:  

    Cryogenic valves are used in very cold applications. Most oil and gas industries use cryogenic temperature range starting at -238° F i.e. -150° . Cryogenic valve has a very keen ability to function in both low (-320° F) as well as high (750 psi) temperature.

  5. Gate Valves: 

    A gate valve is also known as sluice valve and it is mostly used for both above- ground and underground installation. It performs it operation doing a clockwise to close CTC or clockwise to open CTO rotating motion of the stem. Gate valves are also used when minimum pressure loss and a free bore is needed.

  6. Globe Valves:

     Globe valves are used for regulating the flow in the pipeline and for throttling flow control. There is a flow direction arrow marked on the valve body and it must be installed according to it. Pressure classes of globe valve include 150 through 1500.

  7. Pressure Reducing Valves: 

    As the name tells, pressure reducing valves reduce the pressure of a fluid. It controls the downstream pressure or outlet of the fluid. It is an open, 2 ways valve which ensures the pressure of the fluid until the desired pressure is reached downstream.

 

These valves are used in many different appliances, systems, and common items inside the house, industries. Industrial valves are of various types such as Gate Valves, Globe Valves, Ball Valves, Butterfly Valves, Check Valves, Pressure Valves, and Diaphragm Valves, etc. SKG Pneumatics Inc, are leading suppliers of Industrial Valves and Equipment, based in Delhi. They are offering a quality range of industrial valves & all types of fire safety products.

Flanged Valves – Types and Applications

Flanged valves allow assembling the system components without cutting or welding pipe. A flange is a rigid joint that can withstand the pressure and pipe loads related to the system and is a structural element of the piping system.The biggest advantage of using a flanged valve is the valve can be removed easily from the pipe. Another benefit is it ensures a tight joint under given operating conditions which helps in avoiding leakage problems.

Flanged valves allow assembling the system components without cutting or welding pipe. A flange is a rigid joint that can withstand the pressure and pipe loads related to the system and is a structural element of the piping system.

Several dominant standards such as British Standard adopted from the European Standard is followed while deciding the size and joints of the flange. Factors like the type of service, material requirement, maximum pressure capacity, and temperature affect the rating of flanged valves.

The biggest advantage of using a flanged valve is the valve can be removed easily from the pipe. Another benefit is it ensures a tight joint under given operating conditions which helps in avoiding leakage problems.

They are made with different types of materials such as cast irons, bronzes, castable alloys, and forged steels. Flanged valves can be used in various industries including food and beverage, chemical, pharmaceutical, oil and gas, and in waste-water management services.

Different Types of Flanged Valves

The major type of flanged valves are ball valves, check valves, butterfly valves, globe valves, and relief valves.

1. Check  Valves : It is used to prevent back flow in a piping system and they can sustain heavy pressure. Check valves can be used in refining and chemical industries, waste-water management systems, and in oilfield production.

2. Ball Valves: It is used to control the flow of substances and possess poor throttling characteristics. Ball valves can be used in oil and natural gas industry. They are also used in chemical storage and many manufacturing sectors.

3. Butterfly valves: They have limited control capability and are used to regulate flow. They require very less maintenance and are very accurate. They can be used in pharmaceutical, chemical, and food processing services.

4. Globe valves: They use linear motion to throttle flow.Globe valves don’t leak as much as other valves. Globe valves can also be used as stop-check valves as the opening-closing time is shorter. They can be used for high-temperature applications.

5. Relief valves: They are used to protect the system during an overpressure event. Relief valves are used in high-rise buildings, high-water pressure inthe urban water supply network, and mines.

6. Control Valves: A control valve allows specific pressure to pass through the system. They can be used in construction, oil and gas industry, nuclear power industry, pharmaceutical, and refining industry.

Conclusion

Flanged valves serve different purposes and are widely used in various industries. Faulty assembly of the valve can cause dangerous leaks so it is advised to clean the connection thoroughly before installing a valve.

SKG Pneumatics Inc. has all types of valve equipment that serve various purposes. All of our products are highly durable and provides the complete value of money.

Functions and Applications of Automatic Balancing Valve


Automatic balancing valves are used in heating and cooling systems where water flows through the system. Balancing valves are used to ensure the correct distribution of water flow within the system. Water flows from one system to another. When water is flowing in this way it is possible that the pressure is not consistent enough. This can lead to an inconsistent output. To control and regulate these valves are used.

Functions of balancing valves

When Check Valves & Non-return Valve are used in hydronic systems, it ensures a proper design flow within the system leading to a better working of the cooling system where it is being used. Apart from this the other functions of automatic valves are:

  • They work as pressure independent control valves and help to limit flow to achieve the desired rate of flow.
  • It is an automatic valve and does not require manual intervention. This makes it simpler to use and there is no dependence on external persons.
  • Ensures the best flow rate that can improve the efficient working of the system.
  • Valves help to eliminate vibration and noise from the system where they are used.
  • Automatic valves help to achieve better temperature control and cooling is more effective.
  • Since it is automatic in nature, there is no need for a person to be employed to physically operate the valves, thus it leads to savings in terms of labor and time – this translated to savings in money.
  • Easy addition of additional devices to the system without having an effect on balance.

Uses and applications of balancing valves

Automatic control valves have many uses and applications. It is commonly used in applications like:

  • It is used in HVAC (Heating Ventilation Air Cooling) systems used in large commercial and residential buildings to ensure temperature control.
  • It is used in chilled ceilings where a cooling effect has to be produced.
  • It can even be used in fan coil units.
  • It can be effectively used in any heating or cooling system where a balanced flow is needed.

Installation

Automatic balancing valves are very useful devices used in most cooling systems. When an organization wishes to buy and install these valves, they need to make sure they get it from one of the leading suppliers of Balancing valve. A well-known manufacturer and supplier would ensure quality in the valves. Durability and reliability are what one needs to look at while buying these valves.