Types of Valves

Types of Valves With Images | Use of 5 Types of Valves

In this article, we will discuss types of valves.

 

  1. Introduction  

Valves are provided in the pipelines for various purposes. The main purpose of providing a valve is to control and regulate the flow of water. The various types of valves commonly used are as follows:

 

  1.1 Sluice or Gate or Cutoff Valve  

These are the commonly used valve to regulate the flow of water through pipelines. These valves are extensively used in the distribution system to shut off the supplies. It consists of a disc or circular gate parallel-sided or e shaped in cross-section and Having a nut that slots in with the thread of an operating spindle.

The disc or circular gate, by raising or lowering flow can be regulated or controlled. These valves may be provided in every junction and in a suitable interval of about 150 to 300 m in a straight portion. These valves are operated by rotating the spindle clockwise to close and anticlockwise to open.

Sluice or Gate or Cutoff Valve

 

  1.2 Reflux (check valve)  

This non-return valve allows water to flow in one direction only and the flow in reverse direction automatically stopped. It consists of a disc hinged at its top edge provided at the one end in such a way that it opens when the flow is forward and closes if water tends to flow in the reverse direction. This valve is invariably placed in a pumping main.

Air relief or air valve

 

  1.3. Safety or Pressure Relief Valve  

These types of valves consists of a disc controlled by a spring that can be adjusted to the desired pressure. It is provided to release the excessive pressure from the pipeline and protect the pipeline against the possible danger of bursting due to excessive pressure.

When the pressure in pipelines exceeds the desired pressure, the disc is forced to be lifted up and a certain amount of water flows out from the cross pipe thereby releasing the pressure in the pipeline. This valve is also called an automatic cutoff valve.

Safety or Pressure Relief Valve

 

Read More: Pipe Material

 

  1.4. Air relief or air valve  

In a pipeline, air may enter or entrained air get trapped which may be accumulated in the summit or high points of pipeline and maybe serious blockade to flow of water.

It consists of a CI chamber, float, lever, and poppet valve is held in the closed position. The chamber is connected to the bolted-on pipe top opening in the crown. A float mass and a lever in it are adjusted and when water is under pressure it lowers and the poppet valve is opened result the release of pressure.

Air relief or air valve

 

  1.5 Drain or Scour Valve  

These are similar to blow-off valves also known as wash-out valves. They are ordinary sluice valves operated by hand. They are located at the depressions and dead ends to remove the accumulated silt and sand. After the complete removal of silt; the value is to be closed.

Drain or Scour Valve