Rubber Duckbill Check Valve is custom made and is intended for specific applications.It is designed to respond to criteria unique to its purpose,such as line pressure,backflow pressures,and chemical compatibility.
Should the conditions be altered or changed significantly,it could affect the normal operation of the Rubber duckbill Check Valve. Rubber Duckbill Check Valve operates based on differential pressure,When the line pressure(at the valve inlet)exceeds the backpressure(at the valve outlet),the valve opens and flow is created.When the backpressure exceeds or overcomes the line pressure,the bill of the Rubber duckbill Check Valve seals shut,thereby preventing any backflow from occurring.
1.Ensure that pipelines have been depressurized prior to installation,removal,or servicing the Rubber duckbill Check Valve .For best performance,bills should bu installed as close to the vertical position as possible,In cases where clearance below the pipe outlet is minimal,the Duckbill should be rotated only enough as required to avoid contact with the ground.
1.Do not install against raised-face flanges(only to smooth-face flanges).Remove all burrs or sharp edges from the pipe flange faces and wipe clean of oil,grease,etc.Apply a thin coat of graphite or glycerine to the pipe flange face,This will ease installation and allow for easy removal at a later date.
2.Lift the Rubber Duckbill check Valve into position and align the bolt holes of the pipe flange,It flange and the retaining ring.Ensure that the Rubber Check Valve's bill is oriented in a vertical position.
3.After the Rubber duckbill Check Valve and retaining ring(where applicable) are in the correct position,push two bolts through to ensure alignment.After the proper alignment has been obtained,install the remaining nuts and bolts using washer at the split holes(if the Rubber Duckbill Check Valve comes with retaining ring).
4.Use two wrenches when installing the Rubber Duckbill Check Valve .Tighten all flange bolts in a criss-cross pattern similar to the one shown in Figure 2 to the maximum torque recommended in Figure 3.
5.Do not weld near the Rubber Duckbill Check Valve
Established 1998,Zhengzhou Bihe Co.,Ltd is located in Zhengzhou city, China, with registered capital of 1 million yuan, which is invested according to the modern enterprise system by Gongyi Wanda Supplying and Draining Water Co., Ltd. Now it has characteristic of import & export manufacturer & trader.
We have 2 factories, one produce pipeline expansion joints (also known as rubber expansion joints, flexible rubber joints, pipe fittings,etc), and the other branch company is ISO9001:2000 ... View detail