What is the main function of the check valve?

What is the main function of the check valve?

A check valve, non-return valve or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction thereby preventing any backward flow. Check valves are two-port valves, which means they have two openings in the body; one for fluid to enter and the other for fluid to exit.

What are the three types of valves?

All of the most common types of automated valves fall into one of three main categories. They are linear, rotary, and self-actuated. There are a variety of valve types within each of these categories each having its own benefits. This training course is focused on rotary and linear actuated valves.

How do you identify a valve?

The tag itself should identify the valve, usually by showing the valve number. The type of valve and the system the valve is part of typically are identified. For example, the valve tag might read “200# Main Steam Shut Off.” This identifies the valve as the shutoff valve in the 200-pound main steam line.

What is the symbol of a check valve?

An arrow or the symbol for any type of check valve (a fluidic/pneumatic logic symbol) on the outside of the body indicates flow direction. In this image, flow is from top to bottom.

What is the class of a valve?

It defines three types of classes: standard, special, and limited. ASME B16. 34 covers Class 150, 300, 400, 600, 900, 1500, 2500, and 4500 valves. It also allows valves to be classified as intermediate whose pressure- temperature ratings may fall within those listed for the standard and special class valves.

What are the types of valve?

Common valve types include: Ball,Butterfly,Check, Diaphragm, Gate, Globe, Knife Gate, Parallel Slide, Pinch, Piston, Plug, Sluice, etc. The following types of valves are used in a variety of applications, these descriptions may provide a basic guideline in the selection of valves.