丹富斯*止回閥是指依靠介質本身流動而自動開、閉閥瓣，用來防止介質倒流的閥門，又稱逆止閥、單向閥、逆流閥、和背壓閥。止回閥屬于一種自動閥門，其主要作用是防止介質倒流、防止泵及驅動電動機反轉，以及容器介質的泄放。止回閥還可用于給其中的壓力可能升至超過系統(tǒng)壓的輔助系統(tǒng)提供補給的管路上。止回閥主要可分為旋啟式止回閥（依重心旋轉）與升降式止回閥（沿軸線移動）。*止回閥是指依靠介質本身流動而自動開、閉閥瓣，用來防止介質倒流的閥門，又稱逆止閥、單向閥、逆流閥、和背壓閥。止回閥屬于一種自動閥門，其主要作用是防止介質倒流、防止泵及驅動電動機反轉，以及容器介質的泄放。止回閥還可用于給其中的壓力可能升至超過系統(tǒng)壓的輔助系統(tǒng)提供補給的管路上。止回閥主要可分為旋啟式止回閥（依重心旋轉）與升降式止回閥（沿軸線移動）。丹富斯*止回閥特點、*止回閥價格

1、*止回閥的閥瓣呈圓盤狀，繞閥座通道的轉軸作旋轉運動，因閥內通道成流線形，流動阻力比升蝶式止回閥小，適用于低流速和流動不常變化的大口徑場合，但不宜用于脈動流，其密封性能不及升降式。蝶式止回閥分單瓣式、雙瓣式和多半式三種，這三種形式主要按閥門口徑來分，目的是為了防止介質停止流動或倒流時，減弱水力沖擊。   丹富斯*止回閥特點、*止回閥價格

2、*止回閥：閥瓣沿著閥體垂直中心線滑動的止回閥，內螺紋止回閥只能安裝在水平管道上，在高壓小口徑止回閥上閥瓣可采用圓球。蝶式止回閥的閥體形狀與截止閥一樣（可與截止閥通用），因此它的流體阻力系數(shù)較大。其結構與截止閥相似，閥體和閥瓣與截止閥相同。閥瓣上部和閥蓋下部加工有導向套簡，閥瓣導向簡可在閥盞導向簡內自由升降，當介質順流時，閥瓣靠介質推力開啟，當介質停流時，閥瓣靠自垂降落在閥座上，起阻止介質逆流作用。直通式蝶式止回閥介質進出口通道方向與閥座通道方向垂直；立式升降式止回閥，其介質進出口通道方向與閥座通道方向相同，其流動阻力較直通式小。

3、*止回閥：閥瓣圍繞閥座內的銷軸旋轉的止回閥。碟式止回閥結構簡單，只能安裝在水平管道上，密封性較好。   

4、*止回閥：閥瓣沿著閥體中心線滑動的閥門。管道式止回閥是新出現(xiàn)的一種閥門，它的體積小，重量較輕，加工工藝性好，是止回閥發(fā)展方向之一。但流體阻力系數(shù)比旋啟式止回閥略大。

該閥由閥體、閥座、導流體、閥瓣、軸瓦及彈簧等零件組成。內部流道采用流線型設計，壓力損失小，閥瓣啟閉行程很短，停泵時可快速關閉，防止巨大的水錘聲，形成*效果。該閥主要用于給水、排水、消防、暖通系統(tǒng)，可安裝于水泵出口處，防止介質倒流及水錘對泵的損壞。

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

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