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A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...
This is a list of CEN Technical Committees. The European Committee for Standardization (CEN) is one of three European standardisation organisations in the European Union , listed in ANNEX I of the Regulation (EU) No 1025/2012. [ 1 ]
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.
After the Dresden Agreement (1996), CENELEC coordinates standard development activities with IEC.Older IEC standards were converted in 1997 by adding 60000, for example IEC 27 became IEC 60027 and the same standards are also published in the EN 60000 series to indicate adoption by CENELEC as a European standard; for example IEC 60034 is also available as EN 60034.
This gauge uses hoses attached to the various test cocks of the RPZD and checks to be certain that the check valve springs as well as the relief valve spring are not fouled and are working properly. There is a variety of manufacturers of these gauges, but most utilize either a three-valve or a five-valve design to test the RPZD in different ways.
A simplified version of the definition is: The k v factor of a valve indicates "The water flow in m 3 /h, at a pressure drop across the valve of 1 kgf/cm 2 when the valve is completely open. The complete definition also says that the flow medium must have a density of 1000 kg/m 3 and a kinematic viscosity of 10 −6 m 2 /s , e.g. water.
Circular flanges for pipes, valves, fittings and accessories, PN designated; EN 1168: Precast concrete products - Hollow core slabs; EN 1176-1: Playground equipment. General safety requirements and test methods; EN 1177: Impact absorbing playground surfacing. Safety requirements and test methods; EN 1325:2014: Value Management. Vocabulary.
Solenoid valves. A solenoid valve is an electromechanically operated valve.. Solenoid valves differ in the characteristics of the electric current they use, the strength of the magnetic field they generate, the mechanism they use to regulate the fluid, and the type and characteristics of fluid they control.
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