· Suppresses water hammer increasing the disc closing speed and improves the sealing performance by setting the counterweight in the Closed moment position.

· The opening and closing of the disc is performed more smoothly and the flow of the low-voltage fluid is accelerated by setting the counterweight in the Open moment position and maintaining the balance with the disc.

· The inner structure of the swing check valve with a counterweight is simpler compared to other shock absorbing reverse valves. Therefore, there are fewer blockages caused by contaminants.

· The swing check valve with a counterweight enables both horizontal and vertical pipe connections.

What is a check valve used for?

The main purpose of a check valve is to prevent backflow in the system. Figure 1 shows an example of a check valve. A check valve relies on a pressure differential to work. They require a higher pressure on the input side of the valve than the output side to open the valve.

What is cast iron valve?

It is an alloy made from 96%-98% iron, 2%-4% carbon, and small amounts of silicone. It has impressive temperature tolerance, with some cast iron capable of handling temperatures over 2100F (1150C). When it comes to pressure, cast iron's strength depends on its pressure class.

What is the difference between check valve and non return valve?

A non-return valve lets the fluid flow in one direction. When fluid in the line reverses direction, a check valve prevents backflow by allowing flow in one direction. The check valves are usually designed for a particular pressure.

What is the difference between a check valve and a swing check valve?

One difference between these types of check valves is that the they allow and prevent flow. A swing check valve uses a flapper that 'swings' off the seat to allow forward flow and then swings back onto the seat when the flow is stopped.

When should check valves be used?

For example, check valves are used in all stormwater and wastewater systems where they prevent backflow. Failed check valves which are corroded or jammed can result in standing water or flooding and associated health impacts because of contact with contaminated water.

Is a check valve necessary?

Do I need a check valve? A check valve is a valve that is used to prevent backflow in a piping system. ... Even if a pump does have a built-in check valve, we recommend that a check valve be installed in the discharge line within 25 feet of the pump and below the draw down level of the water supply.

Is ductile iron and cast iron the same?

Technically, “cast iron” suggests iron alloys that are cast in a foundry. Ductile iron is one such alloy. However, ductile is a relative newcomer on the scene, with unique mechanical properties that set it apart from the other iron alloys.