Check valves, no matter what type, perform the same basic function. They check the flow of a fluid or gaseous substance. Their construction permits the flow of the material through the valve section. However, it does not permit the fluid or gas to return the way it came. The closure of the valve blocks the route, therefore preventing backflow. An inline check valve accomplishes this action but also performs another important service.
Basics
Their design makes their best installation to involve vertical positioning, not horizontal lines. However, many are capable of functioning effectively in almost any position. They use a spring-assisted disc to ensure a faster closing valve. This type of check or one-way valve comes in different styles including:
- Globe
- Insert
- Threaded/socket weld
- Wafer
End choices also vary. They may be butt weld, threaded, flanged, socket weld, and wafer.
In-Line Check Valves: Preventing Vibration and Hammer-Stop
Inline check valves have several other names. These smaller-bodied check valves have two other names in the literature: nozzle check and silent check valves. The latter refers to the ability of the inline check valve to close so quietly – using spring pressure, it results in a reduction of vibration and hammer-stop. This is advantageous to those who own, operate and maintain the piper. Less hammer-top and vibration mean an extension of the life or working span of the pipes and valves.
Inline Check Valve
You can purchase this type of valve in one or two configurations. These are:
- Ball check – You can employ these in both horizontal and vertical lines
- Fully guided disc – These can be used for both horizontal and vertical lines if they come with specific features e.g. a spring-assist closure
Make certain you understand the operations of each and know what type will best suit your application before you choose one inline check valve category over the other.
