Learn about the valves before use

Why is 3/2 pneumatic Valves used mostly to activate single acting pneumatic cylinders?
January 5, 2018
January 30, 2018

Learn about the valves before use


If you are the new user to the valve in your job. Do not hurry, read the valves carefully and details, so that you can visualize their world. List all the types of valves you need and read them to understand the function and practical application of each type of valve. Surely you will quickly master them.valve

  1. What is the valve?

Valve is a device used to control, isolate, regulate, or divide the flow, pressure, the flow of fluids in piping systems (gas, liquid, solids, fluidized bed, or sludge) working by fully opening, or part of, the flow of the fluid. When the valve is open, the fluid flows in a direction from high pressure to low pressure.

Valve is a device used to regulate, direct or control the flow of a liquid (gas, liquid, or mud) by opening, closing, or opening part of the flow through the valve.

Technically speaking, valves are a machine accessory but are often discussed as a separate machine. When the valve is opened, the liquid flows in one direction from higher pressure to lower pressure. The English word Valve, derived from the Latin word -valva, is the movement of a door, then rotated, swirled, shifted to control the flow of traffic.

From ancient times, the valve was simply a hinged free flap to prevent the liquid (gas or liquid) flowing in one direction. But pushed open by the flow in the opposite direction. This valve is called a One-Way Valve, as it prevents or “checks” the flow in one direction. Modern electric control valves can regulate downstream pressure and flow and operate on complex automation systems. Alternatively, pneumatic control valves can be used for different purposes. Control valves require a moving part to control the opening and closing of the valve. Which is the Control engine for Valve (Damper actuator).

  1. How does the valve work?

Valve is a mechanical device used in the pipeline industry to regulate the flow of fluid. The industrial valve helps you to understand the principle of structure and application range of valves used in industry.

Valve is a mechanical device used in the pipeline industry to regulate the flow of fluid. Industrial valves help you understand the principle of composition and application range of valves used in industry.

Valve operating positions:

  • When the valve is fully closed, there will be no flow of material.
  • If the valve is open only partially, only one part of the flow goes through. When the valve is in this position, it is called regulating the Flow of flow.
When the valve is fully open, the flow through the valve is maximized.

Check valves limit fluid flow in one direction.

Basically, the valve is divided into two types: Manual Valve and control valve.

Manual valve – electric control valve can be seen in many everyday water systems but small size.

Control Valve is used in many industries such as oil refining, chemicals, power plants … Control Valve can also be controlled manually through the Handwheel. The size of the control valve can range from 1 “to 40”. However, for large diameter valves, it is often necessary to use a motor to control. So, called a motorized valve, usually uses three-phase power to control the valve motor.

The valve structure consists of the following parts: body, trim, actuator for control valve. And other accessories such as Handwheel, solenoid valve, E / P positioner, Air set, Pressure reducing valve.

Choice of valve

The choice of valves for each application requires user must have the general knowledge choice of a mechanical, Instrumentation, Electrical, or Material. The cost of a control valve is very expensive, so unreasonable options can cost you money. And you do not meet the technical and safety requirements.

In the past, valves were just as simple as thin pieces of material. And were capable of hindering the flow of material in one direction. But then the designers were gradually improving the valve industry to be more complete, better closing, tightening and more efficient, durability is also much better.

Today, the industrial valve not only switches off the conventional system. But it can also adjust the pressure to change the operating direction of the flow on very complex systems – this is the high-performance electric control valve.

  1. Application of valves

Valves have many applications, including: water control for irrigation, industrial. Used for process control, housing use such as on / off and gas pressure control, steam irons and indoor faucets, etc. Even the aerosol has a small valve built-in. Valves are also used in the field of military and shipping.

Valves are found in most plants, industrial systems. Including water and wastewater treatment, mining, power generation, oil processing, gas and oil, food production, chemicals and plastic production and many other fields.

People in developed countries use valves in their daily lives. Including plumbing valves such as faucets, gas control valve on the stove. Small valve fitted to the washing machine and dishwashers. Safety equipment fitted for hot water systems, and engine valves.