进口*止回阀(德国OLES奥莱斯阀门)
【进口*止回阀】详细说明：
可达快速关闭，防治巨大水击声，形成*效果。该阀主要适用于给排水，消防暖通系统，可安装于水泵出水口处，以防止倒流及水锤对泵的损害。在没有介质流过阀体时，阀瓣在弹簧力的作用下总处于关闭状态，阀瓣的开启、关闭及开启度大小主要取决于进出口端压力差，如果进口端压力大于出口端与弹簧的总和时。
Quick shutdown can be achieved to prevent huge water hammer sound and form a silent effect. The valve is mainly suitable for water supply and drainage, fire fighting and heating systems. It can be installed at the outlet of the pump to prevent backflow and water hammer damage to the pump. When there is no medium flowing through the valve body, the valve disc is always closed under the action of spring force. The opening, closing and opening degree of the valve disc mainly depends on the pressure difference between the inlet and outlet ends, if the pressure at the inlet end is greater than the total time of the outlet end and the spring.
【进口*止回阀】特点
在没有介质流过阀体时，阀瓣在弹簧力的作用下总处于关闭状态，阀瓣的开启、关闭及开启度大小主要取决于进出口端压力差，如果进口端压力大于出口端与弹簧的总和时，阀瓣开启，只要有压力差，阀瓣一直处于开启状态，同时压力差的大小决定阀瓣开启度大小；如果出口端压力与弹簧力总和大于进口端时，阀瓣一直处于关闭状态，由于阀瓣的开启关闭是处于一个动态的力平衡系统中，不管进口端的介质变化如何，此阀运行平衡，且无噪音，安全故障少。
1、阀体内部水流通路采用流线型设计，水头损失小
2、合理、密封性好、耐磨损、使用寿命长
3、有导向装置，关闭灵活，且阀瓣关闭行程短
When there is no medium flowing through the valve body, the valve disc is always closed under the action of spring force. The opening, closing and opening degree of the valve disc mainly depends on the pressure difference between the inlet and outlet ends. If the pressure at the inlet end is greater than the sum of the outlet end and the spring, the valve disc opens. As long as there is a pressure difference, the valve disc is always open. At the same time, the magnitude of pressure difference determines the opening degree of the disc; if the total pressure and spring force at the outlet end are greater than that at the inlet end, the disc will always be closed, because the opening and closing of the disc is in a dynamic force balance system, regardless of the change of the medium at the inlet end, the valve operates in a balanced and noise-free manner. Less total failures.
1. The flow path inside the valve body adopts streamlined design, and the head loss is small.
2. Reasonable, good sealing, wear resistance and long service life
3. Guiding device, flexible closure, and short disc closing stroke, can
【进口*止回阀】结构说明：
1、消声止回阀的阀瓣呈圆盘状，绕阀座通道的转轴作旋转运动，因阀内通道成流线形，流动阻力比升蝶式止回阀小，适用于低流速和流动不常变化的大口径场合，但不宜用于脉动流，其密封性能不及升降式。蝶式止回阀分单瓣式、双瓣式和多半式三种，这三种形式主要按阀门口径来分，目的是为了防止介质停止流动或倒流时，减弱水力冲击。
2、消声止回阀：阀瓣沿着阀体垂直中心线滑动的止回阀，消声止回阀只能安装在水平管道上，在高压小口径止回阀上阀
瓣可采用圆球。消声止回阀的阀体形状与截止阀一样（可与截止阀通用），因此它的流体阻力系数较大。其结构与截止阀相似，阀体和阀瓣与截止阀相同。阀瓣上部和阀盖下部加工有导向套简，阀瓣导向简可在阀盏导向简内自由升降，当介质顺流时，阀瓣靠介质推力开启，当介质停流时，阀瓣靠自垂降落在阀座上，起阻止介质逆流作用。直通式蝶式止回阀介质进出口通道方向与阀座通道方向垂直；立式升降式止回阀，其介质进出口通道方向与阀座通道方向相同，其流动阻力较直通式小。
3、消声止回阀：阀瓣围绕阀座内的销轴旋转的止回阀。碟式止回阀结构简单，只能安装在水平管道上，密封性较好。
4、消声止回阀：阀瓣沿着阀体中心线滑动的阀门。管道式止回阀是新出现的一种阀门，它的体积小，重量较轻，加工工艺性好，是止回阀发展方向之一。但流体阻力系数比旋启式止回阀略大。
5、压紧式止回阀：这种阀门是做为锅炉给水和蒸汽切断用阀，它具有升降式止回阀和截止阀或角阀的综合机能。
此外，还有—些不适用于泵出口安装的止回阀，如底阀、弹簧式，Y型等止回阀。
