Download Types of valves

Butterfly valve is a quarter motion valve used to start, stop, and regulate the flow.

It can be used to isolate equipment’s with low pressure loss. It used where the space is limited.

Advantages:

- Less maintenance

- Available in large and small dimeter

- Throttling

- Easy to install and remove

- Less space requirement

- Inexpensive

- Easy and fast to open and close

Disadvantages:

- Poor sealing function

- Cavitation may occur

Plug valve:

A plug valve is a quarter turn valve. It is suited for on/off

operation. It’s not normally used for throttling.

Plug valve is economical. Their size is usually small in

comparison to ball valve.

Diaphragm valve is bidirectional. They are good at

throttling.

The flow passaged is smooth which results in low pressure drop.

Since Diaphragm valve is good at throttling, they can be used as control valve.

What is the difference between safety valve and relieve valve? (Simply) Safety or relieve valves are used to protect the system against excessive pressure. When there is an excessive pressure, the valve opens and allow the pressure to escape.

Basically, Safety valves are used for steam, air and gases. Relieve valves are generally used for liquids.

Also, there is a SAFTEY RELIEVE valve that can be used both with liquid and gas at the same time.