What is valve?

Valves are mechanical devices that control flow and pressure in a system or process. They are essential components of a pipeline transporting liquids, gases, vapors, waste, etc.

Various types of valves are available: door, globe, plug, ball, butterfly, check, membrane, pinch, pressure reducer, control valve etc. Each of these types have several models, each with counts. Different functions and functions. Some valves operate autonomously. While others are used manually or with actuators or pneumatic or hydraulic.

THE FUNCTION OF THE VALVE IS:

• Stop and start the flow
• Reduce or increase traffic
• Flow direction control
• Adjust the flow or process pressure
• Reduce a pipeline system with a certain pressure

There are many types of valves, types and models, with a wide range of industrial applications. All meet one or more of the functions defined above. Valves are expensive items, and it is important that an accurate valve is assigned to the function. And must be made of the correct material for the process fluid.

Regardless of the type, all valves have the following basic components: body, bonnet, cutter (inner part), actuator and packing.

STYLE OF VALVES:

#1. KNIFE GATE VALVE:

Knife gate valves (also known as knives or slide valves) are linear motion valves. In which a partially closed, flat sliding into the flow to provide closure. They are one of the most popular valves used.

Gate valves and knife gate valves are advantageous in applications involving waste. As their “doors” can be cut right through the mud. They are also used in applications involving viscous liquids such as heavy oils, greases, varnishes, molasses, honey, ice cream and other non-flammable viscous fluids. They are available in large sizes to handle fine flow.

However, gate valves have low pressure limits, and are not optimal in hygienic or sanitary applications. They are ideal for use anywhere with closed valves. When needed, they can also be used where the adjustment is desired. Although this is not recommended. The door shape is caused by the erosion of the chair. And the disc due to the vibration of the disc. in adjustable applications.

Gate valves and knives are designed to minimize the pressure drop on the valve in the fully open position and stop the flow of the liquid completely. Direction of liquid flow is unchanged, and the diameter through which the fluid moves is equal to the amount of pipe. Therefore, they tend to reduce the pressure when fully open.

Applications

Gate valves are used in many industrial applications including petroleum, pharmaceutical, manufacturing, automotive and marine industries.

Gate valves are not very common on ships, in underground applications, rr where space is limited. Because they do not occupy more space. Gate valves can be used in highly demanding environments such as high temperature and high pressure environments. They are commonly found in power plants, water treatment, mining, and offshore applications.

#2. CONTROL VALVE

Control Valves are energy-powered devices that are used to automatically adjust liquid flow or pressure in a process system. The terms ‘control valve’ and ‘throttle valve’ are often used interchangeably. But there is a distinction between the two. Adjustable Valve is a closed valve that can start and stop flow as well as stop along any position of valve valve stroke to regulate flow, temperature or pressure.

The control valve is the final control element in the system. And is used in combination with a drive system or starter. Control valves can not operate as independent valves. And therefore, while all control valves are control valves, not all control valves are control valves.

There are several main functions that control valves must meet to function normally.

These functions include:

• There are no external leaks
• Appropriate for media systems
• Withstand the characteristics of media (corrosion, high temperature)
• Match the rest of the controller

The control valve is triggered by an interruption in the control system. When the control system is tampered with. The valve will manipulate the drive medium to compensate and keep the specified process variable closer to the desired setpoint. These valves are used in the industry for many applications. There are a number of important factors to consider when choosing a control valve for the system. Including reasonable cost, maintenance, energy consumption, and control loop compatibility beyond the items discussed below. here.

#3. SOLENOID VALVE

The solenoid valve is a device that uses a solenoid to control the trigger valve. They are considered mechanical control devices used to control the flow of liquids or gases. An electric current flows through the coil to control the valve by moving a plunger. When the solenoid receives an electrical signal (activated), it channels the air directly to the plunger. When the electrical signal is removed (inoperative), the valve returns to its normal state.

Solenoid valves are used to open and close a system. The medium enters through the input port and flows through the hole before it continues to the exit port. The port is closed and open by the plunger.

Direct action: Solenoid solenoid valves can be considered as direct operation, meaning that the plunger directly opens and closes the slot inside the valve.

Test Operations: Solenoid valves can also be considered as pilot operated, ie the plunger opens and closes a gas hole. The inlet pressure opens and closes the valve. This valve is also called a servo valve.

Applications

Direct Solenoid Solenoid Valve operation is used in many different industries. They are used in machinery, equipment and appliances such as refrigerators and automatic faucets. Solenoid valves are commonly used in central heating systems to control the thermostat to regulate the flow of hot water on the heater. They are also used in automatic sprinkler systems, air control, liquid control, and in pharmacological experiments.

#4. NAMUR VALVE

Namur is a specification for a standard interface between actuators and control valves developed by the European Commission for Standards and Metrology. The namur valve is connected directly to the actuator while the pressure and exhaust hoses are connected through the ports in the valve. Namur’s diverter valves are designed to meet the requirements of the compact actuator design of the VDI / VDE 3845.

#5. ATEX VALVE

For applications requiring installation and connection to fieldbus networks in remote I / O cabinets, ASCO provides an ATEX-certified 622 solenoid valves strip. Suitable for use in ATEX 1-21 zones, manifolds have many unique features that reduce installation, operation and maintenance costs, and ensure minimal downtime. Valves 622 are certified II 2 GD IIC T6 X and the pilots are certified 302 IA: II 1 G Ex ia IIC Ga / II 1 D Ex ia IIIC Leather.

ATEX certification includes 5/2-spring return valves in the temperature range of +5 to + 50 ° C. Valves have a flow rate of up to 600 liters per minute (ANR). Each manifold can have up to 4 positions (8 positions as required).

The electrical and pneumatic connections are designed for speed and ease of use. An integral isolator that allows maintenance without stopping the process and allowing pneumatic and electrical equipment to be installed in the same cabinet – eliminates the need for bulkheads and electrical connections and saves money. significantly.