Studies on the Sprinkler Head (part II)

On the Friction, Water-tightness and Abrasion Test of Packing Ring of Sprinkler Head

Abstract

1. Under venous pressures of water, authors tested about friction coefficient, water leakage and abrasive characteristic of 4 groups, 7 kinds of materials which were taken as packing ring of sprinkler head. (table 1. Fig. 1 (a))
2. Friction characteristics; Group I (fibrinous with asbestos) has suitable coefficient to continue constant low rotation of head. Group II (gum) has somewhat large coeff. and groups III (teflon and copper alloys) have too small coeff. (Fig. 1 (b). Fig. 2(a))
3. Water leakage; All is good excepting group IV. (Fig. 2 (b))
4. Abrasive characteristic; Materials 1, 4 and 7 are superior.
5. From these tests shown above, it was cleared that fibrinous material 1, as used in “Rain Bird” head, has the best characteristics as packing ring.
6. In field tests, material 1 showed the best rotation of head.