止回阀

工作原理：

Working principle:

  橡胶、金属联接器，主要由松套法兰，橡胶、金属波纹管等部件组成。管道系统因环境温度或使用温度产生冷缩或膨胀时，所产生的力和变形量、偏移角度，联接器都能很好的补偿。能吸收系统振动，降低系统噪音，接头两端任意偏转，能自由调节轴向或横向位移等。

  The rubber, metal connector is mainly made up of free flange, rubber and metal ripple pipe etc. The system pipe contracts or expands because of environment temperature or using temperature. The connector can compensate the force, distortion amount and excursion angle, which is made by contracting or expanding. It can absorb system quiver and reduce system noise. The joint ends can be deflected arbitrarily and adjust shaft freely.

  止回阀，主要由阀体、蝶板、弹簧、绞轴及橡胶圈等部件组成。介质由蝶板无簧面进入，当两半圆形蝶板在受介质压力超过弹簧支承力后，使蝶板自行打开，当切断前方介质压力后，蝶板在弹簧压力及介质反压力作用下迅速关闭。微阻缓闭止回阀，蝶板在弹簧压力及介质反作用力下触及液压微阻装置，随着反作用力增大，蝶板缓缓关闭。风道止回阀，蝶板在重锤作用力及介质反作用力下迅速关阀。

  The check valve is mainly made up of valve body, butterfly board, spring, wring shaft and rubber ring etc. the medium enter from butterfly board which is without spring. When medium pressure of the two round butterfly boards is beyond the spring bearing, the board will open itself. When cut off the medium pressure ahead, the board will close quickly on the effect of spring pressure and medium counterforce. The board of micro-block slow-close check valve touches the hydraulic micro-block device on the effect of spring pressure and medium anti-pressure. The board closes slowly as the counterforce increasing. The board of venting pipe check valve close quickly on the effect of hammer force and medium counterforce.

安装及调试：

Installation and regulation

l  安装前必需清洁阀门内腔，不允许有任何杂物和污垢附着。

l  法兰式连接在安装时，两法兰间需加密封垫。对夹式连接在安装时，在法兰与阀体连接处需加密封垫，然后均匀拧紧螺栓。

l  止回阀安装时请注意流向（阀体上有箭头标明）。

l  安装时请调整使伸缩管伸出到伸缩量的1/2。使用一定期限后，需更换密封圈。

l   The body must be cleaned before installed and there is no dirt and sundries clinging to the body.

l   Add seal cushion between two flanges of flange type connection or between the flange and valve body of dual clamp type connection, then screw down bolt when installs the valve.

l   Pay attention to the flow direction of check valve when install. There is arrow on the valve body.

l   Extend the pipe to the 1/2 of extension amount when install the extension pipe. Seal rings need to be exchanged after the steel extension pipe has been used for a period of time limit.

订货须知：

Information for order

l  选用订货时，请参照产品样本注明产品规格、型号及技术参数（使用温度，设备工况、介质性质及工作压力等）。

l  表格中未列的规格、用于特殊介质或其它特殊要求，请与我公司销售部、技术部联系，可为您另行设计制造。

l   Please indicate the type, model and technical parameter (using temperature, working condition of equipment and characteristic of medium etc) referring to the product sample when you place an order

l  If you have other special demand, need special medium or the spec that is not listed in the table, please contact with our department of market and technology. We can design and manufacture for you especially.