High Quality Content by WIKIPEDIA articles! Pneumatic non-return valves are used where a normal non-return valve would be ineffective. This is for example where there is a risk of flood water entering a site but an equal risk of pollution or a chemical spills leaving a site and polluting the environment. Pneumatic non-return valves are installed below ground and can be used to pneumatically lock the non-return valve closed thus containing a site in the event of a spill. It is common practice to lock sites using pneumatic non-return valves during the loading or transferring of chemicals or hazardous waste. Pneumatic non-return valves have a longer service life when compared to pneumatic bladder systems. A chemical hazard arises from contamination with harmful or potentially harmful chemicals. for example Burning of fossils, materials and chemicals used in construction and industry., the environment and water supply., chemical spillages and industrial accidents., deliberate releases.

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