1 Scope This standard specifies the mechanical type, thermostatic and thermodynamic steam traps terminology, structure length and logo of the general requirements. This standard applies to the nominal pressure PN16 ~ 160, the nominal diameter DN15 ~ 150 steam traps. 2 Normative references The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to reach an agreement in accordance with this standard study whether the latest version of these documents can be used . For undated references, the latest version applies to this standard. GB / T12247 steam trap classification (GB / T12247-1989, idtISO6704: 1982) 3 Terms The following terms and definitions apply to this standard. 3.1 Terms Related to Pressure 3.1.1 Maximum allowable pressure maximumallowablepressure The maximum pressure a steam trap housing can withstand at a given temperature. 3.1.2 operatingpressurepressure Steam inlet pressure at the steam trap under working conditions. 3.1.3 Maximum operating pressure maximumoperatingpressure Under the correct operating conditions, the maximum pressure at the inlet of the steam trap, given by the manufacturer. 3.1.4 Minimum operating pressure minimumoperatingpressure In the case of the correct operation, the lowest pressure steam trap inlet. 3.1.5 Operating backpressure operatingbackpressure In the working conditions, the steam trap outlet pressure. 3.1.6 Maximum operating back pressure maximumoperatingbackpressure At the highest working pressure, the correct operation of the steam trap at the outlet of the highest pressure. 3.1.7 back pressure rate rateofbackpressure working back pressure and the percentage of working pressure. 3.1.8 maximum back pressure rate maximumrateofbackpressure highest working back pressure and the highest percentage of working pressure. 3.1.9 Working pressure differential operatingdifferentialpressure Working pressure and back pressure difference. 3.1.10 maximum pressure differential maximumdifferentialpressure Working pressure and maximum back pressure difference. 3.1.11 minimum pressure differential minimumdifferentialpressure Working pressure and minimum back pressure difference. 3.2 Terms related to temperature 3.2.1 Operating temperature operatingtemperature Steam trap inlet temperature under operating conditions. 3.2.2 maximum operating temperature maximumoperatingtemperature The maximum working pressure corresponding to the saturation temperature. 3.2.3 The maximum allowable temperature maximumallowabletemperature Steam trap housing under a given pressure to withstand the maximum temperature. 3.2.4 Opening temperature openingvalvetemperature In the drainage temperature test, the steam inlet temperature when the steam trap is opened. 3.2.5 closing valve temperature closingvalvetemperature In the drainage temperature test, the steam trap closed when the inlet temperature. 3.2.6 Drain temperature temperatureatdischargingcondensate Steam traps continuously discharge the temperature of the thermal condensation water. 3.2.7 Maximum temperature maximumtemperatureatdischargingcondensate Steam trap at the highest working pressure can continuously discharge the maximum temperature of thermal condensation water. 3.2.8 Subcoolledtemperature The absolute value of the difference between the condensing water temperature and the saturation temperature under the corresponding pressure. 3.2.9 open valve subcooledtemperatureofopenvalve open valve temperature and the corresponding pressure under the saturated temperature of the absolute value. 3.2.10 Shut-off valve subcooledtemperatureofclosevalve The absolute value of the difference between the valve closing temperature and the saturation temperature under the corresponding pressure. 3.2.11 maximum subcooling maximumsubcooledtemperature Open valve undercooling in the maximum. 3.2.12 Minimum subcooling minimumsubcooledtemperature The maximum value of the valve undercooling. 3.3 Terms related to displacement 3.3.1 Condensate displacement coldcondensatecapacity The maximum weight at which condensate can be discharged in one hour by a steam trap at a given pressure differential and at 20 ° C. 3.3.2 Thermal Condensate Discharge hotcondensatecapacity The maximum amount of condensate water that can be discharged by the steam trap within an hour at a given pressure drop and temperature. 3.4 Terminology for leakage and load 3.4.1 Amount of steam leakage steamloss The amount of fresh steam that a steam trap leaks per unit of time. 3.4.2 no-load leakage no-loadteamloss Before the steam trap in a fully saturated steam leak conditions. 3.4.3 L steam loadsteam loadteaml steam steam trap leakage under a given load rate. 3.4.4 No-load leakage rate rateofno-loadsteamloss No-load leakage and the percentage of the maximum thermal condensation water displacement under the corresponding pressure. 3.4.5 Loaded rate of flow rateofloadsteamloss There is a percentage of the amount of the leaked steam load and the actual thermal condensation water displacement during the test period. 3.4.6 load rate rateofloadcondensate The actual thermal condensation water displacement during the test time and the percentage of the maximum thermal condensation water displacement at the test pressure. 4 Structure Length 4.1 Classification Steam trap classification according to the provisions of GB / T12247. 4.2 Structure length 4.2.1 Flange connection Steam trap structural length, the size according to Table 1, the limit deviation according to the provisions of Table 2. Table 1 Flanged steam trap construction Length in millimeters Nominal diameter DN Construction Length Series 1 2 3 4 5 6 7 8 20 195 380 580 270 450 290 560 572 580 - 600 - - - 700 Table 2 Flange connections Steam trap structure length limit deviation in millimeters L limit deviation ≤ 250 ± 2> 250 ~ 500 ± 3> 500 ~ 800 ± 4 4.2.2 Internal thread connection and socket welding Steam steam trap structure length L shown in Figure 2 , The size according to Table 3, the limit deviation according to the provisions of Table 4. Table 3 Threaded connections and sockets Welded steam trap structure Length in millimeters Nominal diameter DN Structure Length Series 1 2 3 4 5 6 7 8 15 65 75 80 130 150 20 75 85 90 100 25 85 120 - Table 4 Threaded connections and socket connections Structure length of the steam trap Limit in millimeters L Limit deviation ≤150 ± 1.6> 150 ~ 300 ± 2 5 Marking 5.1 Marking position 5.1.1 The steam traps can be marked on the valve body or on the plate, which must be firmly fixed to the valve body or bonnet. 5.1.2 signs can not be covered. 5.2 Marks that must be used a) Model number of the product; b) Nominal size; c) Nominal pressure; d) Name and trademark of the manufacturer; d) Indicating arrows of the direction of flow of the medium; f) Maximum working pressure; g) Maximum operating temperature. 5.3 Optional signs a) Body material; b) The maximum allowable pressure; c) The maximum allowable temperature; d) The maximum temperature of the drainage; e) The factory number, date. 5.4 The above signs if marked on the valve body can also be repeated on the sign. 5.5 Other signs may be attached as long as they are not confused with the above signs.
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