译文：
疏水阀选型条件
1.疏水阀的疏水量：选用疏水阀时，必须按设备每小时的耗汽量乘以选用倍率2-3倍为{zd0}凝结水量，来选择疏水阀的排水量。才能保证疏水阀在开车时能尽快排出凝结水，迅速提高加热设备的温度。疏水阀排放能量不够，会造成凝结水不能及时排出，降低加热设备的热效率。（当蒸汽加热设备刚开始送汽时，设备是冷的，内部充满空气，需要疏水阀把空气迅速排出，再排大量低温凝结水，使设备逐渐热起来，然后设备进入正常工作状态。由于开车时，大量空气和低温凝结水，较低的入口压力，使疏水阀超负荷运行，此时疏水阀要求比正常工作时的排水量大，所以按选用倍率2-3倍来选择疏水阀。）
2.疏水阀的工作压差：选用疏水阀时，不能以公称压力选疏水阀，因为公称压力只能表示疏水阀体壳承受压力等级，疏水阀公称压力与工作压力的差别很大。所以要根据工作压差来选择疏水阀的排水量。工作压差是指疏水阀前的工作压力减去疏水阀出口背压的差值。疏水阀后背压计算方式是：（当疏水阀后凝结水排入大气时，疏水阀的出口背压为零。如果把疏水阀排出的冷凝水集中回收，此时，疏水阀的出口背压是回水管的阻力、回水管抬升高度、二次蒸发器（回水箱）内压力三者之和。）
3.机械型疏水阀的阀座号：机械型疏水阀按不同的工作压差段，分成多种规格阀座孔径的“阀座号”，每个工作压差段与“阀座号”组成一条坐标曲线的排水量，不同“阀座号”
的疏水量有很大差别。机械型疏水阀应根据工艺条件的{zg}工作压差和{zd0}排水量两者相对应的坐标曲线来选合适的“阀座号”。不能以公称压力来定”阀座号”，
如果选错“阀座号”，有可能出现疏水阀不工作或设备存水，影响设备正常运行。
4.疏水阀的工作温度：选用疏水阀时，要根据管道蒸汽{zg}温度来选择能满足工艺条件要求的疏水阀。管道蒸汽{zg}温度超过公称压力相对应的饱和蒸汽温度称为过热蒸汽，在过热蒸汽管道选择疏水阀时，应选用高温高压过热蒸汽专用疏水阀。
5.疏水阀的连接尺寸：疏水阀的工艺条件决定以后，根据疏水阀前后的工作压差，疏水量和“阀座号”，按疏水阀制造厂家的技术参数来选择疏水阀的规格尺寸。（不能按设备连接尺寸随便选配同样尺寸的疏水阀，疏水阀的连接口径不能代表疏水量的大小，同一种口径的疏水阀，疏水能力可能差别很大；所以选用疏水阀时必须根据设备的工艺条件，参照疏水阀制造厂家提供的参数来选配疏水阀才是正确的选择。）
“ Traps Selection conditions”是由提供的国际阀门新闻，译文仅供参考。另外，中国疏水阀网还提供相关产品搜索：、、、、等。
原文：
Traps Selection Conditions 1. Trap the sparse amount of water: Use
traps, you must press equipment, the consumption of steam per hour
multiplied by the selected magnification 2-3 times the maximum
condensation of water, to select the trap displacement. Can we
ensure that trap while driving discharge condensate as soon as
possible, rapid increase in the temperature of heating equipment.
Trap emission energy is not enough will cause condensation of water
can not be discharged in time to reduce the thermal efficiency of
heating equipment. (When the steam started to send steam heating
equipment, the device is cold, inside filled with air, need to trap
the air quickly discharged, and then row a large number of
low-temperature condensation of water, gradually heat up the
equipment, and equipment in normal working condition. As the car
When a large number of air and low-temperature condensation of
water, a lower inlet pressure, so that overload trap to run, this
time Trap than normal working hours require a displacement of
large, so use magnification by 2-3 times to select the trap.) 2.
Trap working pressure: Selected trap, the trap can not be selected
nominal pressure, as nominal pressure can only say that traps body
shell pressure rating, trap nominal pressure and work pressure
varies greatly. Therefore, according to the work of pressure to
select the trap displacement. Working pressure is the pressure
minus the pre-trap trap the difference between exports of
backpressure. After the back-pressure steam trap is calculated by:
(when condensed water is discharged into the atmosphere after the steam trap, the trap back
pressure is zero exports. If the concentration of traps discharge
condensate recovery, this time, the export of back-pressure steam
trap is a return to the resistance of pipes, water pipes back to a
high elevation, the second evaporator (back to tank) and the
internal pressure of the three.) 3. Mechanical-type steam traps
Seat number: Mechanical-type trap according to different working
pressure section of the valve seat aperture is divided into a
variety of specifications of "seat number", each segment of work
pressure and the "seat number" composed of a coordinate
displacement curve, different "seat number "The sparse amount of
water are very different. Mechanical-type traps should be based on
process conditions of the maximum working pressure and the maximum
displacement of the two curves corresponding to the coordinates of
the election the right "seat number." Can not be determined nominal
pressure to "seat number", if the wrong "seat number", there may be
water in traps do not work or equipment, affecting the normal
operation of equipment. 4. Trap operating temperature: Use traps
when the maximum temperature according to the steam pipes to choose
the process conditions to meet the requirements of traps. The
maximum temperature of more than nominal pressure steam pipe that
corresponds to the saturated steam temperature referred to as
superheated steam, superheated steam pipe selection in the trap,
they should use special high-temperature high-pressure superheated
steam trap. 5. Trap connection size: The decision process
conditions trap after the trap before and after the work under the
pressure to drain water and the "seat number", according to the
technical parameters of trap manufacturers to choose the size of trap
specifications. (Can not connect the device size of random matching
according to the same size of the trap, trap connection caliber can
not represent the sparse amount of water the size of the same
caliber of the trap, the hydrophobic capacity may vary widely; So
when you use traps must be based on the device process conditions,
in the light trap manufacturers matching parameters provided by the
trap is the correct choice.)
原文来源：
