Check valves come in various forms: including swing, lift, ball, piston, and split disc swing check valves. Among them, the fully open swing check valve is suitable for most non-fluctuation situations. Swing check valves are also used on vertical pipes (flow direction upwards). At this time, there is a stop block in the valve to prevent the valve disc from opening beyond the top dead center. Swing check valves cannot be used on vertical pipelines with downward flow direction. If used in places with low fluctuations and low flow rates, the swing check valve will vibrate and will eventually damage its sealing surface. For extended service life, the disc can be coated with a layer of Stellite. To reduce seat leakage, elastic seals should be used. Removable seats are preferred because they are easy to service and allow for easy replacement of seals in the valve. Swing check valves should use a screw or bolted bonnet for inspection and repair of the disc and seat. In many cases, repairable high pressure swing check valves on pipelines can be as small as DN65 (2.5NPS) or DN80 (3NPS). 1. Swing check valve of low profile design (space saving), suitable for installation between two flanges. This type of check valve does not normally open fully and requires removal from the pipeline for repairs. 2. The double disc thin check valve occupies a small space and is light in weight, so it is usually used in offshore oil. Double Disc Low Profile Check Valves cannot be used for pulsating service due to fatigue that can cause spring failure. However, non-slamming (or automatic) check valves or swing check valves can be considered. 3. The lift check valve can only be used in small diameter (DN40) and high pressure pipelines to handle clean fluids. Lift check valves can be designed for use in horizontal or vertical pipelines, but the two are not interchangeable. Because lift check valves are usually gravity operated, they can become clogged by paraffin or debris. 4. Ball check valves are very similar to lift check valves. Since the ball is lifted by hydraulic pressure, this type of check valve does not have the tendency of the flap to close the slam like a rotary check valve. Therefore, in pipes not larger than DN50 (2in), it is better for cleaning fluids that change the flow direction frequently. 5. Self-balancing, axial piston, non-automatic check valve, recommended for pipelines with fluctuating flow, such as reciprocating compressors and pump outlet pipelines. They are not suitable for use in pipelines where the fluid contains sand or impurities. Piston check valves are equipped with an orifice plate to control the movement of the piston. Orifice plates for liquids are much larger than those for gases. Piston check valves designed for gas lines should not be used for liquid service unless the orifice plate in the piston is replaced. The check valve is somewhat similar to the ball valve
. The ball valve is a circle, while the check valve is a valve whose opening and closing part is a circular disc and then acts on its own weight to prevent the flow of fluid. The check valve is different from others. The check valve is a one-way valve, so it is also called a check valve. This is what I want to tell you today, I hope it can be helpful to you.
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