Check Valves - Wafer Swing..

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.

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem.

Special Features:

• Very low face to face dimension hence space required for mounting is less than 10% of conventional valves
• Very low weight – total weight is only approximately 1/6 the weight of a conventional valves
• Saving in terms of overall length required for piping
• Practically maintenance free due to fewer number of parts and simple construction
• Self centring in pipeline due to controlled outside diameter, enables easy installation
• Valve can mount any direction

Applications

1. Delivery line of pumps
2. Chemical industry
3. Petrochemical industry
4. Compressed air, gases and vacuum lines
5. Refineries
6. Water and effluent plants
7. Corrosive liquids and gases
8. Filtration and Ion exchange process

Constructional Features

Body

The body is the main pressure containing structure of the valve and the most easily identified as it forms the mass of the valve. It contains all of the valve's internal parts that will come in contact with the substance being controlled by the valve.

Disc

The disc provides a leak proof closure for the valve body. The disc can rotate on its axis and thereby prevented the local wear.

Seat

Seat shall be PTFE and conform to relevant standard – Replaceable

Material of Construction:

Technical Specification

Design and Manufacturing Standard

• API 6D

Testing Standard

• API 598

Size range

• 50mm to 600mm

Operation

Non slam check valves are opened by the pressure of the fluid and closed by the spring as soon as flow ceases and before reverse flow occurs.