American standard check valve order production is completed and exported to the United States

Author:     Published time:2022-05-06 09:41     Reading times:324    

Butterfly check valve refers to the valve that automatically opens and closes the valve disc depending on the flow of the medium itself to prevent the backflow of the medium. It is also known as check valve, one-way valve, reverse flow valve and back pressure valve. The check valve belongs to an automatic valve. Its main function is to prevent the backflow of medium, the reverse rotation of pump and driving motor, and the discharge of container medium. The check valve can also be used on the pipeline to supply the auxiliary system in which the pressure may rise above the system pressure. Check valves can be mainly divided into swing check valve (rotating according to the center of gravity), lift check valve (moving along the axis) and butterfly check valve (rotating along the center).

The function of butterfly check valve is to only allow the medium to flow in one direction and prevent the flow in one direction. Usually, this kind of valve works automatically. Under the action of fluid pressure flowing in one direction, the valve disc opens; When the fluid flows in the opposite direction, the fluid pressure and the self weight of the valve disc act on the valve seat, so as to cut off the flow.

In this order, the customer requires that the valve plate is made of CF8M, the valve body is made of cast iron, the valve body pressure is PN10, the valve body color is red, and the sizes of DN50 and DN100 butterfly check valves are determined

The order was completed on time and delivered on time. The customer manager also sent the installation precautions and possible problems to the customer, which was highly praised by the customer.

The installation of check valve shall pay attention to the following matters:

1. Do not make the check valve bear the weight in the pipeline. The large check valve should be supported independently to prevent it from being affected by the pressure generated by the pipe system.


2. During installation, pay attention that the direction of medium flow should be consistent with the direction of the arrow on the valve body.


3. Lift type vertical disc check valve shall be installed on vertical pipeline.


4. Lift type horizontal disc check valve shall be installed on horizontal pipeline

Possible faults, causes and elimination methods of check valve:


1. Leakage at the connection between valve body and bonnet:


(1) If the nut is not tightened or the tightness is uneven, it can be readjusted.


(2) If there is damage or dirt on the flange sealing surface, repair the sealing surface or remove the dirt.


(3) If the gasket is damaged, replace it with a new one.


2. Leakage at the sealing surface of valve disc and valve seat


(1) Dirt is sandwiched between the sealing surfaces, which can be cleaned.


(2) If the sealing surface is damaged, regrind or re weld and process it.


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