Check Valves

Swing check valves ensure that the fluid in the pipe can only flow in one direction. The pressure of the fluid on the non-return valve pushes it into the seat and thus prevents backflow. However, a lever with a weight can also be fitted here.

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The check valve works completely autonomously and also ensures very good tightness. The swing check must be installed horizontally or vertically upwards in the flow direction of the liquid and is available in nominal sizes from 1/2″ to 36″. A heavy-duty hook can be attached to the larger nominal sizes to optimise installation and make it as simple as possible.
Check valves are “automatic” industrial valves that open with forward flow and close with reverse flow. The pressure of the fluid flowing through a system opens the valve while any reversal of the flow will close the valve. The exact operation depends on the type of check valve mechanism. The most common types of check valves are swing types, piston types or dual plate types.

Types of check valves

Swing type

A swing check valve consists of a valve body, a bonnet and a disc connected by a hinge. The disc swings away from the valve seat to enable a forward flow and returns to the valve seat when the fluid flow is stopped to prevent backflow.
The disc in a swing check valve is unguided because it opens or closes completely. Many plate and seat designs are available to meet the requirements of different applications. The valve enables full, unobstructed flow and closes automatically when pressure decreases. These valves are fully closed when the flow reaches zero to prevent backflow.

Piston type | Lift type

The seat construction of a check valve is similar to that of a globe valve. The disc usually has the shape of a piston or ball.
Piston type check valves are especially suitable for high pressure applications where flow velocity is high. With this type of valve, the disc is precisely guided and fits perfectly into the damper. Piston type check valves are suitable for installation in horizontal or vertical pipelines with an upward flow. The flow rate for raising the disc must always be below the seat. When the flow occurs, the disc or ball in the guide from the seat is raised by the upward flow pressure. When the flow stops or reverses, the disc or ball is pressed against the seat of the valve by the backflow as well as by gravity.

Check Valve Rückschlagklappe 16" Zoll Class 600 LBS

Check valves, Swing Type

Description:

Material: A216 WCB, A352 LCC, A217 C5, A217 C12, A217 WC6, A351 CF8M, CF3M
Class 150 LBS up to Class 1500 LBS
High Pressure up to Class 2500 LBS
RF – Ends
BW – Ends

• Product features (optionally available)

Valve disc available in different materials
Depending on the choice of material, the check valves are suitable for water, steam, oil, gas or other aggressive media.
Special paint according to customer requirements
Operating manual & instructions for gate valves can be provided in various national languages
TÜV approvals (3.2)

Datasheets as PDF for download

150 LBS

300 LBS

600 LBS

900 LBS

1500 LBS

2500 LBS

Check valves, Spring Loaded

Description:

Material: A216 WCB, A352 LCC, A217 C5, A217 C12, A217 WC6, A351 CF8M, CF3M
Class 150 LBS up to Class 1500 LBS
High Pressure up to Class 2500 LBS
RF – Ends
BW – Ends

• Product features (optionally available)

Valve disc available in different materials
Special Opening Pressure available
Depending on the choice of material, the check valves are suitable for water, steam, oil, gas or other aggressive media.
Special paint according to customer requirements
Operating manual & instructions for gate valves can be provided in various national languages
TÜV approvals (3.2)

Datasheets as PDF for download

150 LBS up to 1500 LBS

Check valves, Dual Plate

Description:

Material: A216 WCB, A352 LCC, A217 C5, A217 C12, A217 WC6, A351 CF8M, CF3M
Class 150 LBS up to Class 1500 LBS

• Product features (optionally available)

Flap or vanes available in different materials
Spring also available in INCONEL or similar
Depending on the choice of material, the Dual Plate Check Valves are suitable for water, steam, oil, gas or other aggressive media

Datasheets as PDF for download

150 LBS up to 900 LBS

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Check valve (spring loaded)

The spring loaded check valve is a valve that automatically closes when a certain pressure is reduced and opens automatically with the use of a spring. It therefore functions autonomously. This industrial valve can be installed horizontally or vertically and can also be equipped with a regulation disc, which enables even more precise regulation in the pipeline. The spring loaded check valve is available in nominal sizes from ½” to 12″ with flange connection (RF) ASME B16.5 or welding ends ASME B16.25.

Additional heavy-duty hooks can be fitted for larger nominal diameters. It can also be installed in Inconel materials.

Check valve (dual plate)

To prevent fluid from flowing back into the pipes, a flap is fitted between two flanges in the pipe, so that it can only flow in one direction. This dual plate check valve does not require any actuation or adjustment as it operates autonomously. Another advantage is the low opening pressure of the valve. It is easily opened with a spring, which can also be installed in Inconel materials. The valve closes automatically when the pressure is reduced. It is important that the dual plate check valve is installed horizontally in a pipeline. The valve is provided with an arrow indicating the correct flow direction.