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Main functions and common faults of check valves

Posted by Bundor valve

Check valves also known as check valves or check valves, its role is to prevent the flow of media in the pipeline.The bottom valve of water pump is also a check valve.Open and close parts rely on the flow of media and force to open or close, in order to prevent the backflow of media valves called check valves.Check valves belong to automatic valves, mainly used for one-way flow of media on the pipeline, only allow the media to flow in one direction, in order to prevent accidents.Usually fluid pressure causes the disc of the valve to open and flow from the inlet side to the outlet side.
Check valves

Common failures of check valves include:

1. Disc is broken;

2. Media backflow.

Causes of disc breakage are:

Check valve before and after the medium pressure in a nearly balanced and each other "saw" state, disc and seat often flap, some brittle materials (such as cast iron, brass, etc.) made of the disc is broken.Prevention is to use a check valve with a ductile disc.

The reasons for the backflow of media include:

1.Sealing surface destruction;
2. Clamping impurities.Repair the sealing surface and remove impurities to prevent backflow.

The reasons for the backflow of media include:
1. Sealing surface damage;

2. Clamp in impurities.Repair the sealing surface and clean impurities to prevent backflow.

Purpose of dual type check valve:

Check valves are installed in piping systems to prevent media backflow. Check valves are automatic valves that open and close depending on media pressure.Wafer check valve is suitable for nominal pressure PN1.0mpa ~ 42.0mpa, Class150~25000;Nominal diameter DN15~1200mm, NPS1/2~48;The working temperature is -196~540℃ in all kinds of pipelines, used to prevent the backflow of media.Through the selection of different materials, can be applied to water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and uric acid and other media.

Main materials of wafer check valve:

There are carbon steel, low temperature steel, duplex steel (F51/F55), titanium alloy, aluminum bronze, INCONEL, SS304, SS304L, SS316, SS316L, Chromium-molybdenum steel, Monel (400/500), 20# alloy, Haversian alloy and other metal materials.The utility and structural characteristics of sandwiched check valves.