A check valve is a one way valve which means the flow can only go one way and stop one way. They are mostly placed in the outlet side of the pump, so it can make sure the pump does not get any backflow. They are mostly placed in hvac systems, in which hvac systems are placed in big buildings. It is cheap, effective, and easy to use. Have to make sure the valve is facing the right way, it will have an arrow on top so it can show you where the flow will be coming from. If it is installed wrongly the flow could back up and cause a lot of damage to the pump and the valve. For the valve to be open it has to have a certain amount of pressure flow coming through, that’s called “cracking pressure”. The pressure could differ depending on the size and and the design of the valve. If the inlet pressure is not high enough for the outlet pressure then the valve shall close. The most common type of check valve is spring loaded in-line check valves. Where the flow has enough pressure so the valve can open. ANother valve type is spring loaded y it is the same as the spring loaded inline check. The only difference is the way the disc is placed, since it is more at an angle so it tends to be more of any shape. Another valve type is a diaphragm, it does not have cracking pressure. The diaphragm has a rubber diaphragm that flexes the inlet pressure to increase. A lift valve has a guided disc that lifts up from the seat allowing the fluid flow through.
Kinds of wafer check valves
The disc check valves are smaller than the standard swing valves and they cost considerably less. These valves usually have four parts and they are body, disc, spring and a spring retainer. The design of these wafer check valves is another advantage apart from the size and cost. It is because of this design; these valves can be installed in any position. For instance, they can be fitted even in the vertical pipelines where the liquids flow downwards.
Swing type wafer check valves
These valves are usually similar to that of the standard swing valves. Here the valves do not have full body like others, so when the valve opens up, the flap is required to move in to the top of the pipeline. In order for this work, the flap has to be designed with smaller diameter than that of the pipe. Because of the pressure considerations, the swing type wafer check valves are usually used only in larger size pipelines.
Function of duo check valve
The function of the duo check valve is dependant on the two check valves. The check valve may be defined as the mechanical device which allows the flow of fluid in only one direction. These check valves are typically two port valves as they have two openings in them; one for the fluid to enter and the other one for the fluid to leave. A ball valve or a gate valve is installed at both the ends of the duo check valves for the purpose of separation or testing. Usually, very small ball valves are fitted in this position in order to fasten the testing equipment. This is done to test whether the duo check valves are still functional.
Applications of dual disc wafer check valve
The dual disc wafer check valve can operate at two separate conditions very effectively. First of all, during the normal flow of the fluid through it, the spring loaded check valve is opened in order to let the fluid flow. On the other hand, during the reverse flow, the spring loaded check valve closes in order to arrest the flow of fluid. As far as the applications are concerned, the duo check valve assemblies are very much appropriate for back siphonage and the back pressure related functions. But these valves are not preferable for the highly hazardous applications. The most common and general usage of the duo check valve is in fire sprinkler, lawn irrigation and for the use in combi boiler systems.
ANIX Stainless Steel Swing Check Valve Class 200 Threaded NPT
316 Stainless steel, ThreadedSize: 1/2″ to 3″
- – ANIX Swing Check Valve Valve Class 200 Threaded NPT
- – Stainless Steel 316 SS body
- – Full Port / Full Bore
- – Design: ASME B16.34
- – Test & Inspection: API 598
- – End Connections: Threaded
- – Threaded Type: ANSI B1.20.1 (NPT)
- – Working Pressure: 200 psi
- – Applicable medium: Water, Oil & Gas.
ANIX Stainless Steel Swing Check Valve Class 150 / 300 RF
SS 316, Stainless Steel, CF8M Sing Check Valve Trim 10
Sizes available: 1/2″ to 12″
ANIX Carbon Steel Swing Check Valve – RF, Trim 8, Class 150 / 300 / 600
Known as Cast Steel, Carbon Steel, WCB or CS Swing Check Valve.
Sizes available: 2″ to 12″.
Size 14″ to 20″ available for made-to-order only
Class 600 available for made-to-order only.
ANIX Stainless Steel 2-Piece Spring Loaded Check Valve Threaded NPT
316 Stainless steel, Size: 1/4″ to 2″
ANIX Stainless Steel 3-Piece Spring Loaded Check Valve Threaded NPT
316 Stainless steel, PN40 Size: 1/4″ to 2″
ANIX Stainless Steel Wafer Double Disc Spring Check Valve
Wafer Double Disc Check Valve
Sizes available: 2″ ~ 24″
ANIX Forged Steel A105 Check Valve Threaded Class 800
Sizes available: 1/2″ ~ 2″
Material: A105N or F316
ANIX Forged Steel Swing Check Valve Flanged Class 600 / 300 / 150
Sizes available: 1/2″ ~ 1-1/2″