British Spirax Sarco steam traps (the trap) is to automatically exclude heating equipment or steam pipe steam condensate and non-condensable gases such as air, steam and does not leak. Because the trap has the effect of blocking the exhaust steam, steam heating equipment can heat evenly to make full use of the latent heat of steam to prevent water hammer occurs steam pipe. British Spirax Sarco steam trap selection method to exclude the same amount of condensed water at a certain pressure, using different forms of traps. Various traps have - given the technical performance and the optimum operating range. To select Depending on the conditions, not simply from the point of maximum displacement to choose from, and should not only based on the size of water condensation in the selection of sulfur diameter valve. Generally in the selection, first according to the conditions of use, reference to the technical performance of the installation location of various traps chosen the most appropriate form of vegetable valve, according to the trap before and after the working pressure and the condensation of water from the factory sample selected trap specifications, quantities. ① in condensate load changes to below 15% of rated maximum displacement of the hole should be chosen pull type traps, because at low load will cause some loss of live steam leaks. ② in a lower condensate must be removed immediately after the formation of the case, should not use traps orifice plate, can not use hot static type of bellows-type trap, because both require a certain degree of supercooling (approximately 1.7 ~ 5.6 ℃ ). ③ As the orifice plate and thermostatic trap type condensate traps can not be ruled out immediately, so we can not for the steam turbine, the steam pump or steam trap with competent, even if the turbine casing hydrophobic, nor choose. Above are made of float traps can also be used when necessary thermal power type traps. ④ thermal power type trap nearly continuous drainage performance, greater range of applications, generally can be selected. But shall not exceed the maximum allowable backpressure pressure 50%, the minimum working pressure of not less than 0.05MPa. Requirements quiet place float steam trap should be used. Indoor steam heating equipment or piping ⑤ intermittent operation, the choice of inverted bucket traps, its good performance exhaust. ⑥ outdoor installation of traps should not use a mechanical type traps, if necessary antifreeze measures (such as downtime venting, insulation, etc.). Spirax Sarco steam traps installed position ⑦ although different, but according to the condensation of water and trap direction is broadly divided into three cases, as shown below: Figure (a), can be used in any form of trap ; Figure (b) shows a floating barrel can not be chosen, the choice of bimetallic steam traps; Figure (c) shows the elevation of the condensate trap formation and location are basically the same, the choice of a floating barrel, thermal power type or bimetallic steam traps.