瓣阀

If the boiler don't close the check valve, then must prevent back flowing to the boiler, valve clack mould weight and buffering piston can seal under gravity action, they make steam and condensed water can't flow back to the boiler under the low air pressure.

如果锅炉没有关闭截止止回阀，则必须防止回流到锅炉上，阀瓣压铁和缓冲活塞，在重力的作用下，能够迅速实现密封，使得蒸汽和冷凝水即使在低压下也不会回流到锅炉里。

With the affects of tgravity, the valve clack and damper piston can get sealed immediately that steam and condensed water won't refluence to the boiler even in an atomosphere of low pressure.

如果锅炉没有关闭截止止回阀，则必须防止回流到锅炉上，阀瓣压铁和缓冲活塞，在重力的作用下，能够迅速实现密封，使得蒸汽和冷凝水即使在低压下也不会回流到锅炉里。

ZL03 2 354312.The innovations include: automatic self-closing and reliably sealed valve structure: the design of duplex valve clack with pilot valve to tackle the problem of reverse seal structured valve being difficult to be opened; an automatic drain control device to automatically drain the remaining water from the hydrant; protective plate provided between the hydrant body and the valve block to serve as a connection between the hydrant body and the valve block, which is the first one to be damaged when the ground hydrant is clashed, and prevent pulling-off of the whole above-ground part of the fire hydrant, so as to properly protect the main parts from any damage. The self-closing and reliably sealed valve now prevents drain of water, and only the damaged protective plate is needed to be replaced before immediate re-operation. Thus the repair work after clashing is very easy and simple.

其创新点为：具有能自动关闭并可靠密封的阀门结构：采用有先导阀复式结构阀瓣设计，解决反向密封结构阀门开启沉重费力的难题；设计自控排水装置，能自动排除栓体内余水；在栓体和阀体之间设计撞裂板，它既起到连接栓体和阀体的中介作用，又可在地上消火栓被撞击时率先破裂毁坏，并使露出地面的栓体不见整体脱落，有效保护各主体部件的完好无损，而此时阀门的自闭式结构可靠密封阀门阻止水源外泄，修复时只需更换损坏的撞裂板即可立即复位投入使用，使被撞后的修复工作变得十分轻松简便。

Thoroughly clean the seat area and clapper sealing surfaces of both Checks.

彻底清洗两个止回阀的阀座面和阀瓣密封面。

Spring-loaded safety valve: The compression spring force to the pressure balance valve and to the seal flap.

弹簧式安全阀：利用压缩弹簧的力来针型阀平衡阀瓣的压力并使之密封。

But this time there is a stop block valve to prevent valve flap over top dead center and open.

而这时阀内有一个停止块来防止阀瓣超过上死点而打开。

This prevents stem from scoring and galling and provides longer disc seal and body life.

这种结构避免阀杆刮伤和磨损，延长阀瓣密封和阀体的使用寿命。

This protects the stem from bending, scoring and galling and provides longer disc, seat and body life.

避免了阀杆粘着，刮伤和磨损，延长阀瓣、阀座和阀体的使用寿命。

This was mainly spring bending stem, install the valve malposition or stuck valve caused.

这主要是弹簧弯曲阀杆、阀瓣安装位置不正或被卡住造成的。

Reversible seat disc rubber, extends check valve life

可逆阀座阀瓣橡胶，延长止回阀寿命

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了