《ISO-6704-1982.pdf》由会员分享，可在线阅读，更多相关《ISO-6704-1982.pdf（6页珍藏版）》请在三一文库上搜索。
1、International Standard (! 6704 0 * 4 4!Yi! INTERNATIONAL ORGANIZATION FOR STANDARDIZATION*MEXAYHAPOflHAR OPrAHbl3AUHR RO CTAHjlAFTM3Al other traps, combining these different types (or of a new design) may be developed, but these traps shall not be regarded as a characteristic type of automatic steam
2、 traps in the sense of this International Standard. If one considers the mode of actuation of the obturation device, three categories of automatic steam traps can be distinguished : - mechanical traps, actuated by the level of condensate (4.1); - thermostatic traps, actuated by the temperature of co
3、ndensate (4.2); - thermodynamic traps, actuated by fluid dynamics (4.3). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 23:13:31 MDTNo reproduction or networking permitted witho
4、ut license from IHS -,-,- IS0 6704-1982 (El Sketch (diagrammatic) 4.1 Mechanical traps (float traps) (actuated by the level of condensate) 4.1.1 Steam trap with closed float I Direction of fluid flow 4.1.2 Steam trap with open top float 3 I 1 Closed float 2 Obturator 3 Lever 4 Seat 4.1.3 Steam trap
5、with open inverted float 1 Float (bucket type) The opening or closing 2 Obturator movements of the obturator 3 Lever are caused by the variations 4 Siphon of the level of condensate in 5 Seat the float. Direction of fluid flow 3 Direction of fluid flow 1 Open inverted float The opening or closing 2
6、Obturator movements of the obturator 3 Lever are caused by the variations 4 Vent hole of the level of condensate in 5 Seat the float. Operation The opening or closing movements of the obturator are caused by the variations of the level of condensate in the trap shell. Copyright International Organiz
7、ation for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 23:13:31 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6704-1982 (El Sketch (diagrammatic) Operation I.2 Thermostatic traps :actu
8、ated by the temperature of condensate) t.2.1 Vapour pressure trap 1 / 3 1.2.2 Bimetallic or thermoelastic trap I- 3 4.2.3 Liquid or solid expansion trap I 1 Deformable element 2 Obturator 3 Seat 1 Bimetallic element 2 Obturator 3 Seat 1 Expansible element 2 Obturator 3 Seat Direction of fluid flow T
9、he opening or closing movements of the obturator are actuated by imbalances created between the pressure of condensate in the trap and the vapour pressure of the volatile liquid contained in a deformable element. The temperature changes of the incoming condensate cause the deformation of the bimetal
10、lic or thermoelastic element, and consequently the opening and closing movements of the obturator. The opening or closing movements of the obturator arecaused by the temperature variations of the condensate acting on an element with a high thermal expansion coef- ficient. 3 Copyright International O
11、rganization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 23:13:31 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6704-1982 (E) Sketch (diagrammatic) Operation 4.3 Thermodynamic trap
12、s (actuated by fluid dynamics) 4.3.1 Obturator trap Direction of fluid flow - * 4.3.2 Impulse trap Direction of fluid flow t 1 Obturator 2 Pressure chamber 3 Seat 1 Obturator (piston valve) 2 Pressure chamber 3 Seat 4 Decompression orifice 4.3.3 Labyrinth or orifice trap 1 Orifice (one or more) 2 Ad
13、justable obturator Direction of fluid flow (optional) The successive differences of pressure between the inlet and the pressure chamber cause the opening or closing movements of the obturator. The successive differences of pressure between the inlet and the pressure chamber cause the opening or clos
14、ing movements of the obturator (piston valve). Fluids pass freely through the orifice. Condensate may eliminate or reduce the flow of steam or non-condens- ables. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 23:13:31 MDTNo reproduction or networking permitted without license from IHS -,-,-