DIN EN 13789 pdf free download

DIN EN 13789 pdf free download.Cast iron globe valves.
4.1.1.2 The manufacturer shall declare the materials of construction and any coatings of components in contact with the line fluid from which the suitability of the valve for the application can be determined. 4.1.1.3 Welding of grey cast iron and impregnation of castings of all materials is not permitted. 4.1.2 Pressure/temperature ratings 4.1.2.1 The pressure/temperature ratings shall be in accordance with EN 1092-2 for the equivalent ISo material grade. Annex B shall be used to determine the equivalent Iso material grade for the EN material grades specified in Table 1. 4.1.2.2 Any restrictions of temperature and/or pressure below those specified in EN 1092-2, for example, those imposed by soft seals, special trims, shall be indicated on the valve (see 8.1.2). 4.1.2.3 The use of valves at lower temperatures than shown in the pressure/temperature rating tables in EN 1092-2:1997 is permitted providing that the body and bonnet is manufactured from spheroidal graphite cast iron material grades EN-GJS-350-22-LT or EN-GJS-400-18-LT. For temperatures below the lowest temperature shown in the rating tables the maximum allowable pressure shall be no greater than the pressure corresponding to the lowest temperature in the rating tables. The lowest scheduled operating temperature shall be not less than the temperature specified in EN 1563 for the Charpy impact tests. 4.1.3 Dimensions 4.1.3.1 Face-to-face, centre-to-face and end-to-end dimensions Face to face and centre-to-face dimensions of flanged valves shall be in accordance with EN 558-1 and specified by the purchaser (see Annex A). The end-to-end dimensions of threaded end valves are at the choice of the manufacturer. 4.1.3.2 Body ends Flanged ends shall be in accordance with the requirements of EN 1092-2. Threaded ends shall be of the internal form in accordance with Type Rc or Rp to ISO 7-1:1994. 4.1.3.3 Body end port inside diameter The body end port shall be circular. For unlined valves, the body end port inside diameter shall be not less than the nominal inside diameter specified in Table 2. 4.1.4 Operation 4.1.4.1 Operating device Unless otherwise specified by the purchaser, the valve shall be supplied with a handwheel. If the valve is to be operated by an actuator, then the valve/actuator attachment shall be in accordance with EN Iso 5210 for multi-turn actuators. For linear actuators, the valve/actuator attachment is the choice of the manufacturer. 4.1.4.2 Operating direction The valve shall be closed by turning the handwheel in a clockwise direction when viewed from above the handwheel. Marking of the handwheel shall be in accordance with EN 19. 4.2 Functional characteristics 4.2.1 Shell design strength The shell design strength shall be verified by a type test in accordance with EN 12516-3. 4.2.2 Flow characteristics 4.2.2.1 The seat bore shall be either full bore or reduced bore. It is permissible for any disc guides and/or lugs required to facilitate the ftting of seat rings to intrude into the bore of the valve. 4.2.2.2 Globe valves shall be suitable for flow in either direction or in one direction. 4.2.2.3 Globe valves may be used as regulating valves in which case they shall be supplied with a profiled obturator, e.g. parabolic or conical. DIN EN 13789 pdf download.