丹富斯*止回阀是指依靠介质本身流动而自动开、闭阀瓣，用来防止介质倒流的阀门，又称逆止阀、单向阀、逆流阀、和背压阀。止回阀属于一种自动阀门，其主要作用是防止介质倒流、防止泵及驱动电动机反转，以及容器介质的泄放。止回阀还可用于给其中的压力可能升至超过系统压的辅助系统提供补给的管路上。止回阀主要可分为旋启式止回阀（依重心旋转）与升降式止回阀（沿轴线移动）。*止回阀是指依靠介质本身流动而自动开、闭阀瓣，用来防止介质倒流的阀门，又称逆止阀、单向阀、逆流阀、和背压阀。止回阀属于一种自动阀门，其主要作用是防止介质倒流、防止泵及驱动电动机反转，以及容器介质的泄放。止回阀还可用于给其中的压力可能升至超过系统压的辅助系统提供补给的管路上。止回阀主要可分为旋启式止回阀（依重心旋转）与升降式止回阀（沿轴线移动）。丹富斯*止回阀特点、*止回阀价格
1、*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。 丹富斯*止回阀特点、*止回阀价格
2、*止回阀：阀瓣沿着阀体垂直中心线滑动的止回阀，内螺纹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。蝶式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、*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、*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。
该阀由阀体、阀座、导流体、阀瓣、轴瓦及弹簧等零件组成。内部流道采用流线型设计，压力损失小，阀瓣启闭行程很短，停泵时可快速关闭，防止巨大的水锤声，形成*效果。该阀主要用于给水、排水、消防、暖通系统，可安装于水泵出口处，防止介质倒流及水锤对泵的损坏。
零件名称 | 阀体、阀盖、阀瓣 | 密封面 | 摇杆 | 销轴 | 垫片 |
零件材料 | 碳钢 | 堆焊硬质合金 | 碳钢 | 铬不锈钢 | 柔性石墨+304 |
Silent check valve is to rely on the flow of the medium itself automatically open and close the valve, backflow valve to prevent the media, also known as check valve, Dan Xiangfa, the reflux valve, and back pressure valve. Check valve is an automatic valve, the main role is to prevent the media back, to prevent reverse pump and drive motor, and discharge the container medium. Check valve can also be used for the pipe to the pressure may rise to assist system exceeds the system pressure supply on. Check valve can be divided into swing check valve (according to the focus of rotation) and lift check valves (along the axis of movement). Silent check valve is to rely on the flow of the medium itself automatically open and close the valve, backflow valve to prevent the media, also known as check valve, Dan Xiangfa, the reflux valve, and back pressure valve. Check valve is an automatic valve, the main role is to prevent the media back, to prevent reverse pump and drive motor, and discharge the container medium. Check valve can also be used for the pipe to the pressure may rise to assist system exceeds the system pressure supply on. Check valve can be divided into swing check valve (according to the focus of rotation) and lift check valves (along the axis of movement). Check valve according to the structure and the installation methods can be divided into:
Disc 1, silent check valve cylindrical disk-shaped, around the seat of the shaft for rotation channel, because the valve channel into a streamlined, flow resistance than the small rise butterfly valve for large caliber occasions, in low flow and no flow frequently changes, but not for the pulsating flow, the sealing performance can't lift. Butterfly valve sub unicuspid type, double valve type and most of type three, the three by the valve diameter to form.the main points, the purpose is to prevent the media to stop the flow or back, the weakening of the hydraulic shock.
2, silent check valve: the valve body along the vertical center line of sliding valve, check valve with internal thread can only be installed in horizontal pipelines, the high-pressure valve on the small caliber ball valve can be used. Butterfly type check valve body shape and the same cut-off valve (with valve common), so it is more fluid drag coefficient. Its structure is similar with the valve, the valve body and valve with the same cut-off valve. The lower part of the upper valve cover processing and a guide sleeve is Jane, Jane can guide the valve flap valve lift free in the simple light driven, when the medium downstream, the valve thrust open by the media, when the media stopped flow, the valve by the self - vertical landing on the seat, preventing the media from the upstream effect. Straight through butterfly valve direction of medium inlet and outlet channel direction and the valve seat perpendicular; vertical lift check valve, the direction of medium import export channel in the same direction with the valve seat, the flow resistance is smaller than the straight through.
3, silent check valve: the valve rotating around a shaft pin seat within the check valve. Disc check valve structure is simple, can only be installed in horizontal pipelines, sealing well.
4, silent check valve: the valve body along the center line of the sliding valve. Pipeline type check valve is emerging as a valve, its small size, light weight, good processing, is one of the development direction of check valve. But the fluid drag coefficient than the swing check valve slightly larger.
The valve consists of a valve body, a valve seat, a flow guiding body, valve, bearing and a spring and other parts. The internal flow passage using streamlined design, small pressure loss, the valve opening and closing stroke is short, stop the pump can be quickly closed, to prevent the huge water hammer, the formation of the mute effect. The valve is mainly used for water supply, drainage, fire protection, HVAC system, can be installed in the pump exit, to prevent the media back and water hammer damage to the pump.
Part name of valve body, valve cover, valve sealing surface of valve rocker pin shaft gasket
Parts and material of carbon steel welding hard alloy steel chromium stainless steel flexible graphite +304
主要技术参数
公称压力 | 1.0 | 1.6 | 2.5 |
zui高工作压力 | 1.0 | 1.6 | 2.5 |
密封试验压力 | 1.1 | 1.76 | 2.75 |
壳体试验压力 | 1.5 | 2.4 | 3.75 |
适用介质 | 水 | | |
介质温度 | X<80℃， T≤150℃， H≤200℃ | | |
