The first time I learned that the ball valve is a company specializing in the production of sand casting valves in Wenzhou, they are located in a coastal city with convenient transportation and superior geographical position. Also in this company I know what to pay attention to when choosing a ball valve. Next, I will share with you the small ball valve selection tips: usually the ball valve usually uses rubber, nylon and PTFE as the valve seat seal material, so the use temperature is improperly selected by the palace sealant. Or if the seal is produced on the sealing surface and the valve plug cannot be rotated in the valve body, the valve must be inspected.
The cylindrical plug valve is equipped with a Teflon sleeve and a valve plug seal in the valve body. It is pressed into the valve body by a compression nut, and the expansion force of the valve is applied to the sealing force of the Teflon metal to achieve sealing.
Conical plug valve
(1) Compact conical chill valve
The plug valve is not filled with a packing, and the sealing between the valve plug and the sealing surface of the valve body is achieved by tightening the nut under the cock, and is generally used for a low pressure occasion with a nominal pressure PN<0. 6 MPa. The shape of the conical chiller with a small U-diameter internal thread connection is shown. The leakage gap between the sealing pairs of the cone-shaped plug valve can be adjusted by pressing the valve plug deeper into the seat. When the valve plug is in close contact with the valve body, the valve plug can still rotate, or lift 90° from the valve seat before rotating, and then seal the seal after Iflj.
(2) Packing conical plug valve
Conical plug valve such as. The packing conical plug valve body has a packing body to seal the valve plug and the sealing surface of the valve body by pressing the packing. The sealing conical chilling valve has good sealing performance and is used for the case where the nominal pressure PN=1. 0? 〗 6. MPa. The screw under the valve body is used for the adjustment of the tight fit between the valve plug and the valve body.
(3) Teflon sleeve sealed conical plug valve
In order to overcome the lubrication and maintenance problems of the plug valve, the Teflon sleeve simple sealing conical plug valve was developed. In this valve, the valve plug rotates inside the Teflon sleeve that is embedded in the valve body, and the Teflon sleeve prevents the valve from sticking. However, the sealing area is large and the sealing stress is high, and the operating torque is still large. On the other hand, since the sealing area is large, even if there is some damage to the sealing surface h, the leakage is well prevented, and therefore, the valve is strong and durable.
I hope that the above tips will help you to buy ball valve products. Welcome everyone to come and talk to each other.