EN 1489 pdf free download

EN 1489 pdf free download.Building valves – Pressure safety valves – Tests and requirements.
3 DEFINITIONS For the purposes of this standard the following definitions apply: 3.1 pressure safety valve limits the pressure of the water in the water heater to a predetermined value by discharging water to drain. In case of temperature control failure, it will discharge the energy stored in the water as steam. 3.2 nominal set pressure (Pnr) is the pressure of the pressure safety valve which is set on production. 3.3 water-tightness pressure (Pe) is the pressure up to which the pressure safety valve is closed.Copper-zinc alloys containing more than 10 % zinc are subject to dezincification when submitted to water capable of dezincification. In the countries where the use of products made of dezincification resistant materials is required, the products have to guarantee a dezincification depth less than 200 μm in any direction, they have to be tested in accordance with the standard EN ISO 6509 and have to be marked in compliance with the indications under section “MARKING” (point 11). .5 DESIGN AND DIMENSIONAL REQUIR EM ENTS 5.1 General guidance a) The pressure safety valve shall be of the type where the spring is isolated from the water by a diaphragm or equivalent. b) All sliding elements shall be designed to prevent any risk of seizure, scaling or sticking. c) Sliding or rotating parts of the pressure safety valve shall not be in contact with water. d) The components controlling the setting of the pressure safety valve shall not be accessible to the end user without damage to the valve. e) The pressure safety valve shall be designed so as to make the opening pressure no greater than 1,3 Pnr, and under this pressure, manual lift of the pressure safety valve shall be in conformity with the requirements of the tests given in section 6.5.1. f) Wing or similar guides of the pressure safety valve shall not be used on the inlet side of the pressure safety valve. g) The normal operation of the pressure safety valve shall not be influenced by external forces. h) The body of the pressure safety valve shall have two suitable flats to apply a spanner. i) If there is only one direction for operation of rotary controls of a pressure safety valve it shall be anticlockwise.6.4 Endurance test Procedure: . The pressure safety valve shall be connected to test apparatus capable of supplying water at (65土2) °C, a minimum flow rate of 2,4 litres/ hour, and a pressure greater than the rating pressure (Pan) of the valve to be tested. a) Subject the pressure safety valve to 5000 cycles, as follows: i) increase the pressure to obtain a flow rate of 2,4 litres/hour and maintain the pressure for a period of5 s, and i) decrease the pressure to 0,8 times the pressure in i) and maintain for a period of5 s. b) Store the pressure safety valve for 28 days at ambient temperature. c) Repeat a) on the pressure safety valve that has been stored. At the end of the endurance test, carry out the nominal opening flow pressure test as specified in section 6.2.3.  EN 1489  pdf download.