Design of the check valve

Swing check valve - its closing element is a disc mounted on an axis located outside the flow passage. In the closed position, the disc is held by gravity and may be supplemented by a spring or a lever-weight mechanism. The valve is mounted between two flanges bolted together with threaded studs.

The valve body is made of cast iron, steel, or stainless steel, while the disc is made of stainless steel. It is characterized by compact dimensions, low cost, and significant hydraulic resistance.

Typically, swing check valves are installed on pipelines with a nominal diameter of DN50 and larger and are widely used in heating, heat supply, water supply systems, boiler houses, and heat substations.

Swing check valves should not be installed too close to other pipeline elements, as in the open position, the disc may extend beyond the flange.

Dual-plate check valve - the closing element consists of two segments mounted on an axis located in the center of the flow passage.

The design of the check valve includes a spring mechanism that holds the disc in the closed position. This feature allows swing valves to be installed in any position relative to the horizon.

The body is made of cast iron, steel, or stainless steel, while the disc is made of stainless steel.

Dual-plate check valves are used for pipelines with a nominal diameter of DN50 and larger, transporting water, steam, or compressed air.

The main disadvantage of the valve is that the rotation axis and the plates themselves are located in the center of the flow, causing significant pressure losses. In addition, they cannot be used with liquids that transport large particulate matter.

Wafer check valve - its closing element consists of a flat disc placed perpendicular to the flow axis. The disc always has a spring and can move along the pipeline axis. The valve is mounted between two flanges fastened with threaded studs and can be installed at any angle to the horizon.

The body of the wafer check valve is made of brass, steel, stainless steel, or cast iron, while the disc is made of stainless steel.

They are widely used in engineering systems on pipelines with a nominal diameter of DN50 and larger. The main disadvantage of wafer check valves is that they are not fully pass-through and create significant pressure losses. The design of the wafer check valve does not allow it to be used with viscous media and liquids containing solid and fibrous materials.

Wafer check valves are characterized by small connection sizes, light weight, and low cost.