They are mainly applied to equipment of mud circulating system in the well of oil mine,the control of mud circulating and the close of mud . the connection is thread in the shape of ladder , it is easy and quick to install the equipment ,moreover they have the features: strong rigidity,security and reliablity. Both valve seat and wedge disc adopt parallel flexible seal which is good sealed and convenient to switch. Each end of the valve is connected to the pipeline and sealed , the removable joint adopted sphere movable contact, linked with "O'' rubber ring has the feature that has good sealing and don't ask for much straightness of pipeline's ends being installed.

They are mainly applied to equipment of mud circulating system in the well of oil mine,the control of mud circulating and the close of mud .The connection is thread in the shape of the ladder, it is easy and quick to install the quipment ,moreover thay have the advantages: strong rigidity,security and reliablity.Bith valve seat and wedge disc adopt parallel flexible seal which is good sealed and convenient to switch . Each end of the valve is connected to pipeline and sealed ,the removable joint adopted sphere movable contact ,linked with "O” rubber ring has the feature that has good sealing and don't ask for much straughtness of pipeline's ends being installed.