|
 ◎非金属弹性密封的阀门，其最大允许泄漏量为零，金属密封的阀门，其最大允许泄漏量为0.1xDNmm3/S，所以合格的金属密封阀门可能会有微小泄漏量，因此，要求无泄漏的场合，尤其是管路终端，宜选用球阀。
◎管螺纹连接的球阀与管端的管螺纹相连接，其中内螺纹可以是圆柱管螺纹，也可以使圆锥管螺纹，而外螺纹必须是圆锥管螺纹。在安装时，应扳钳该螺纹同侧的六角或八角部位，不应扳钳球阀另一端六角或八角部位，以免造成球阀变形。
◎黄铜球阀的公称压力：1.6MPa，2.5MPa，4.0MPa，介质温度：
-20℃~150℃。当球阀用于饱和 蒸汽时，饱和蒸汽压力≤0.6MPa。
◎为延长球阀的使用寿命，球阀应作全开和全关使用，不宜部分开启作节流使用。因为部分开启时，流动着的介质会冲蚀和密封面，从而影响密封性。
◎The
maximum permissible leakage of the valve
with non-metal elastic seals is zero,
and that of the ball valve with meal
seals is
0.1xDNmm3/S. Therefore, acceptable
valves with metal seals possibly have
slight leakage. So, in the applications
where must not be any leakage,
especially at the pipeline ends, ball
valves with soft seals should be used.
◎If the
ball valve with pipe thread connection
is connected with the pipe threads on
the pipe end, its female thread may be
parallel or tapered one, but its male
thread must be tapered type. When
installing the valve, it is necessary to
clamp the hexagonal or octagonal
position on the same side as its thread
instead of the hexagonal position on the
other end of the valve, so as to prevent
the valve deforming.
◎Nominal
pressure of brass ball valve is 1.6MPa,
2.5MPa, 4.0MPa, the temperature is
-20℃~150℃. When the valve is used for
saturated steam. The pressure of the
saturated steam should be ≤0.6MPa.
◎To
increase the service life of a ball
valve, it should be full opened or
closed instead of partial opening for
throttling purpose, as when it is
partially open, the flowing medium will
erode the ball and sealing
surface and thus affect the sealing
performance of the valve. |
|
 ◎非金属弹性密封的截止阀，其最大允许泄漏量为零，金属密封的阀门，其最大允许泄漏量为0.1xDNmm3/S，所以合格的金属密封阀门可能会有微小泄漏量，因此，要求无泄漏的场合，尤其是管路终端，宜选用软密封的截止阀，而不宜采用金属密封的截止阀。
◎管螺纹连接的截止阀与管端的管螺纹相连接，其中内螺纹可以是圆柱管螺纹，也可以是圆锥管螺纹，而外螺纹必须是圆锥管螺纹。在安装时，应扳钳该螺纹同侧的六角或八角部分，不应扳钳截止阀另一端六角或八角部分，以免造成截止阀变形。
◎黄铜截止阀的公称压力：1.6MPa，金属密封介质温度：-20℃~150℃，非金属弹性密封介质温度：-10℃~110℃，当截止阀用于饱和蒸汽时，饱和蒸汽压力≤0.6MPa。
◎The
maximum permissible leakage of the stop
valve with non-metal elastic seals is
zero, and that of the stop valve with
metal seals is 0.1xDNmm3/S. Therefore,
acceptable stop valve with metal seals
possibly have slight leakage. So, in the
applications where there must not be any
leakage, especially at the pipeline
ends, stop valves with soft seals should
be used instead of that with metal
seals.
◎If the
stop valve with pipe thread connection
is connected with the pipe threads on
the pipe end, its female thread may be
parallel or tapered one, but its male
thread must be taper thread when
installing the valve, it is necessary to
clamp the hexagonal or octagonal
position on the same side as its thread
instead of the hexagonal or octagonal
position on the other end of the stop
valve so as to as to prevent the valve
deforming.
◎Nominal
pressure of brass stop valve is 1.6MPa.
Medium temperature for metal seal is
-20℃~150℃, and medium temperature for
non-metal seal is -10℃~110℃. When the
stop valve is used for saturated steam,
the pressure of the saturated steam
should be ≤0.6MPa. |
◎管螺纹连接的闸阀与管端的管螺纹相连接须控制管端外长度尺寸，以免管端过量旋入以致顶压闸阀管螺纹内端面，造成阀座变形而影响密封性。
◎非金属弹性密封的阀门，最大允许泄漏量为零，金属密封的阀门，其最大允许泄漏量为0.1xDNmm3/S，所以合格的金属密封阀门可能会有微小泄漏量，因此，要求止回阀无泄漏的场合，宜选用软密封的止回阀。