Flanged Wafer Check Valve

Product Description

Check valve connected by flanges are collectively referred to as flange check valves. The check valve can be divided into four types: threaded connection, flange connection, welded connection and wafer connection. Flange connection is the most common connection method.

The disc of the flange check valve is disc-shaped and rotates around the shaft of the valve seat channel. Because the channel in the valve is streamlined, the flow resistance is smaller than that of the butterfly check valve. It is suitable for low flow rate and poor flow. It is suitable for large-diameter occasions with frequent changes, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of lifting type.

Flanged check valves are usually carbon steel or stainless steel bodies; discs and springs are cast stainless steel AISI 316. Sizes range from DN50 to DN1200. Pressure and temperature ranges are in accordance with API 598. Fluids for the retention of aqueous media, oil and natural gas.

Product Range

Design standards: API 594, API 6D.

Testing and Inspection: API 598

Body material: carbon steel, stainless steel, alloy steel.

Normal diameter: 2"~48" (DN50~DN1200)..

Terminations: Wafer, Lug, Clip, Flange

Pressure range: 150 lbs~2500 lbs (PN10~PN420).

Working temperature: -196℃~ +560℃.

Classification of flange check valves

According to the structure, the flange check valve is further divided into butterfly wafer check valve, flange vertical check valve and lift flange check valve.

The butterfly wafer check valve is divided into three types: single-valve type, double-valve type and multi-half type. These three types are mainly divided according to the valve diameter. The purpose is to prevent the medium from stopping or flowing backwards and weakening the hydraulic impact.

Flange check valve working principle

During the use of this valve, the medium flows in the direction of the arrow shown in the figure.

When the medium flows in the specified direction, the valve disc is opened by the force of the medium; when the medium flows backwards, the valve disc and the sealing surface of the valve seat are tightly closed due to the self-weight of the valve disc and the action of the reverse force of the medium by the valve disc. Close to prevent the reverse flow of the medium.

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