Types of Valves


October 12, 2018

You must have heard of two or more different types of valves. Valve is a mechanical device that blocks a pipe (partially or entirely) to change the amount of fluid passing through it. Valves also regulate gases and not just liquids. Every machine that uses gases or liquid has a valve in them. The surprising fact about valves is that it’s not only machines that use kp-lok.com valves; your body also uses valves. There are essential valves inside your heart that allow it to pump blood into your lungs and then around your body.

How valves are made

Valves are products of plastic or metal materials, and they have different parts. The outer part of a valve is called the seat, and it has a solid metal outer casing and a soft inner rubber, so the valve makes a closure that is tight.

The inner part of the valve that opens and closes is the body, and it connects to the seat when the valve is closed.

It is vital that valves in closed position should not allow gas or liquid to escape through the piping system to avoid pollutions, accidents, or explosions. This is why the seat of a valve needs to be secure, and the valve that is turned off must be tightly closed. You need to apply force when turning off a valve. That is why some valves are operated by large wheels or long levers.

Types of valves

There are several types of valves for a wide variety of application. The different types of valves have different names; we will discuss a few for more clarity:

Types of Valves

  1. Ball Valves. In a ball valve, a hollowed out sphere sits tightly inside a pipe which completely blocks the fluid flow. So when you turn the handle, the ball swivels through ninety degrees allowing the fluid to flow through the middle of it.
  2. Diaphragm Valves. Diaphragm valves feature a diaphragm at the cap of the valve that is controlled using a wheel style lever.
  3. Check valves. Check valves are made to allow flow using a line in one direction. They are available in different material and sizes.
  4. Butterfly valves. The butterfly valve is a disk that sits in the middle of a pipe and swivels sideways or upright to block the flow entirely.
  5. Needle valves. Needle valves use a long, sliding needle to regulate fluid flow precisely in machines like central heating systems and car engine carburetors.
  6. Spool Valves. Spool valves control the flow of fluid in hydraulic systems. It slides back and forwards to make fluid flow in one direction or the other around a circuit of pipes.
  7. Cock or plug valves. In cock or plug valves, the flow is blocked by a cone-shaped plug that moves aside when you turn a handle or wheel.
  8. Globe valves. Taps are an excellent example of the globe valves. When you turn the handle, you screw a valve upward, and water flows up through a pipe and out through the spout below. Globe valves can be set to allow less or more fluid through it.