SNZ AS/NZS 2638.2
Gate valves for waterworks purposes Part 2: Resilient seated
|Publication Date:||27 May 2011|
This Standard specifies requirements for PN 16 and PN 25 metal-bodied resilient-seated gate valves for waterworks purposes, with a maximum operating temperature of 40°C. This Standard is applicable to the following versions:
(a) Valves of nominal sizes DN 80 to DN 750 with inside screw and non-rising spindle design, operated by a removable key, with or without a gearbox, for buried applications.
(b) Valves of nominal size DN 80 to DN 750 with inside screw and non-rising spindle design, operated by a handwheel, with or without a gearbox, for above-ground applications.
(c) Valves of nominal size DN 80 to DN 300 with outside screw and rising spindle design, operated by a handwheel, for above-ground applications where the position of the gate is required to be visible.
(d) Valves of nominal sizes DN 450 to DN 750 with an integral bypass arrangement.
1 The design criteria of the valve and fasteners should be based on a minimum life expectancy of 50 years.
2 Purchasing guidelines are given in Appendix B.