Valves - general EN Standards have generally been referred to in this Specification. Any other equivalent national or International standard` may be used, subject to the Engineer's approval. All valves shall be best waterworks quality and shall be suitable for use with water or waterworks sludge at temperatures of up to 45o C. Valve bodies shall give the following information: manufacturer's name hydraulic test pressure size of valve direction of flow (where flow in only one direction is permitted). ‘arrow’ The operating gear of valves shall be such that one person can open and close the valve against an unbalanced head 15% in excess of the maximum likely to be encountered in service. Gate valves be provided with renewable seats. Gates shall be capable of being removed without removing the valve body from the pipework. All valves shall have a pressure rating as designated on the drawings, the rating of a particular valve being equal to or greater than the maximum working pressure (including surge) to which the valve may be subject under pipeline operational conditions. The operation of all valves shall be such that they are closed by turning the handwheel or in a clockwise direction. The handweel or tee-key shall be large enough to allow operation by one person. All materials shall comply with the appropriate EN Standards and shall be subject to the Engineer's approval. All castings shall be free of blowholes and other defects. All standard valves shall be suitable for frequent operation, and for infrequent operation after long periods in the open or closed condition, and shall satisfy the requirements of the open and closed end tests. Butterfly valves be installed in the pipework in such a manner that they can easily be removed from the line for dismantling and replacement of the seats and seals, and shall be designed to give minimum leakage. Check (non-return or reflux) valves shall possess high speed closing characteristics, with minimum shock on closing. (a) Gate valves
Valves - general EN Standards have generally been referred to in this Specification. Any other equivalent national or International standard` may be used, subject to the Engineer's approval. All valves shall be best waterworks quality and shall be suitable for use with water or waterworks sludge at temperatures of up to 45o C. Valve bodies shall give the following information: manufacturer's name hydraulic test pressure size of valve direction of flow ‘arrow’ (where flow in only one direction is permitted). The operating gear of valves shall be such that one person can open and close the valve against an unbalanced head 15% in excess of the maximum likely to be encountered in service. Gate valves be provided with renewable seats. Gates shall be capable of being removed without removing the valve body from the pipework. All valves shall have a pressure rating as designated on the drawings, the rating of a particular valve being equal to or greater than the maximum working pressure (including surge) to which the valve may be subject under pipeline operational conditions. The operation of all valves shall be such that they are closed by turning the handwheel or in a clockwise direction. The handweel or tee-key shall be large enough to allow operation by one person. All materials shall comply with the appropriate EN Standards and shall be subject to the Engineer's approval. All castings shall be free of blowholes and other defects. All standard valves shall be suitable for frequent operation, and for infrequent operation after long periods in the open or closed condition, and shall satisfy the requirements of the open and closed end tests. Butterfly valves be installed in the pipework in such a manner that they can easily be removed from the line for dismantling and replacement of the seats and seals, and shall be designed to give minimum leakage. Check (non-return or reflux) valves shall possess high speed closing characteristics, with minimum shock on closing. (a) Gate valves
IFB-PP6-THVAP-W-CB-03-3-Lot-3-Works-on-Puhaceni-CIS-Section-IX-Particular-TS.docx