Device of the check valve

Swing check valve - its closing element is a disc attached to an axis located outside the flow section. In the closed position, the valve is held by gravity and can be supplemented with a spring or lever-weight mechanism. The valve is mounted between two flanges fastened with threaded bolts.

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

Swing check valves are typically installed on pipes with a nominal diameter of DN50 and above and are widely used in heating, water supply, and thermal power systems.

A short straight section of pipe should be provided after the swing check valve during installation, as the disc can extend beyond the downstream flange in the open position.

Double disc check valve - its closing element consists of two segments attached to an axis located in the center of the flow section.

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

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

Double disc check valves are used for pipes with a nominal diameter of DN50 and above that transport water, steam, or compressed air.

The main disadvantage of the valve is that the axis of rotation and the discs themselves are located in the center of the flow and cause significant head losses. Additionally, they cannot be used with fluids that transport large particulate matter.

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

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

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

Disc check valves are characterized by small connecting sizes, low weight, and low cost.

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