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The APL Swing Check Valve (APL Swing Check Valve) is a type of valve used to prevent the reverse flow of media in a piping system. They are widely used in industries such as petroleum, chemical, water treatment and food processing, especially where there is a need to prevent upstream pressure changes in pumping applications or systems from causing reverse flow.

Swing check valve is mainly composed of body, disc (disc) and hinge. The disc is opened when the fluid is flowing forward and closed when the fluid is flowing backward to prevent reverse flow. The hinge keeps the disc connected, allowing it to swing between the open and closed positions.

In terms of material selection, swing check valves can use carbon steel, low temperature carbon steel, low alloy steel, austenitic stainless steel, duplex stainless steel and nickel alloy to ensure corrosion resistance, high pressure and temperature change. Common ANSI grades include 150#, 300# and 600#, with temperatures ranging from -196 ° C to 500 ° C.

Swing check valves are Type A according to API 594, which specifies the requirements and dimensions of check valves used in the oil and gas industry. The face to face dimensions of the valve are included in the API 594 standard, which is crucial for installation because it tells how much space the valve will take up in the pipe to ensure compatibility with the pipe being installed.

In addition, swing check valves are regulated by a variety of other standards, such as API 6D, ASME B16.34, MSS SP-71, BS 1868, ISO 15761 and DIN 3202, which specify the design, size, material specifications, testing and marking of valves.

When installing a swing check valve, it is necessary to ensure the correct direction and position of the valve so that it can work properly. Usually, these valves are installed on horizontal pipes, but in some cases they can also be installed on vertical pipes, as long as the upstream flow direction is consistent with the flow arrow on the valve.

Jiangsu Lianxin Valve Co., Ltd. offers a detailed product range of swing check valves, including valve sizes from 2 "to 36" (DN50-DN900) and pressure grades from ANSI Class 150 to 2500 (PN16-PN420).