Double check valves

A double valve is powered from hydraulic, pneumatic, solenoid sources. The length ranges from 25-35mm and above, breadth from 16-38mm and above, height from 20-25mm and above, diameter from 13-26mm and above, size from ½- 4 inch and above, temperature from -50 to 90 degree celsius and pressure ranges up to 175 bar. The device is manufactured using lead free brass, stainless steel and zinc. It is mainly used by food, dairy, beverage and pharmaceutical industries.

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Detailed Description for Double check valves

A double check valve is a plumbing fitting that averts back siphonage to shield fresh water supplies from impurities. This fitting is normally fitted on fresh water supplies for lawn irrigation, combi-boiler, and fire suppression feeds where a backflow contamination danger exists. The unit comprises of two customary backflow check valves attached in series in a single housing. The simple notions behind these valves comprise of redundancy and the more dependable seating of every valve. Larger industrial type double check valves mainly include an isolation valve on either of the ends and test cocks at several points while residential examples are typically sleek, in-line designs.

Major source of fresh water contamination is back siphonage or backflow and it has been positively associated with various waterborne ailment outbreaks. Backflow contamination hazards exists everywhere with fresh drinking water supplies are used to feed fire sprinkler systems, lawn or pastoral irrigation, combination boilers or chemical dosing installations. If no backflow shield is fixed to these systems, any substantial fall in fresh side pressure will enable contaminated water siphoning back into the potable supply. The most effective way to protect fresh water supplies against this backflow is the fitting of backflow stoppage equipment such as double check valve.

A check valve is a robust, simple and reliable one-way valve that depends on a spring or gravity loaded plunger or a diaphragm to let liquids to move in single path only. This is usually attained by building the valve in a way that the valve disc unseals when exposed to pressure from one. The double check valve features two such units mounted in series with the water flow track. The notion behind this design is a two-fold blend of severance and competence.


The severance benefits of the double check valve are quiet understandable; one valve is always being able to back the other up in case of a blockage or mechanism failure. From an efficiency perspective, the pressure variance throughout the two valves during the process means that both are able to seat more efficiently, thus enhancing the total efficiency of the system. The flexibility of the double check valve is enhanced further by the insertion of dual shutoff valves on either end of the fitting which let either side of the circuit to be isolated when the necessity arises. These and smaller test cocks used to test the working of the system are usually found on larger industrial variants. Domestic double check valves are usually smaller and simpler and are normally in-line designs or are amalgamated into standard faucets or bibs.



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