Ball valve soft and hard seal difference

   Hello!Everyone,welcome visit our website,let's explore the difference between  ball valve soft and hard seal together.

    In the various types, there are two types that are difficult to distinguish, hard sealed ball valves and soft sealed ball valves, although these two are our more common ball valves, but the two have many differences, let me introduce it to you.

1. Differences in structure and mechanism

In general, the hard seal of the ball valve refers to the seal between the metal and the metal, and the sealing ball and the seat are metal. The soft seal is the contact of the two-seal surface can be alone, or can all use soft materials.

2, the sealing material is different

Under normal circumstances, the hard-sealed ball valve is precisely machined using the seat material to ensure the accuracy of the match with the spool (ball), generally stainless steel and copper. The soft seal means that the sealing material embedded on the seat is non-metallic material, because the soft seal material has a certain elasticity, so the processing accuracy requirements will be relatively low.

3, the use of different conditions

In terms of use conditions, generally soft seals can reach a high level, while hard seals can be high or low according to requirements; Hard seals can generally do very high pressure, soft seals can not; The soft seal needs to be fireproof, because at high temperatures, the material of the soft seal will leak, while the hard seal does not have this problem; The soft seal can not be used in some cases due to the problem of the flow medium (such as some corrosive media); Finally, hard sealed valves are generally more expensive than soft sealed valves. As for the manufacturing, there is little difference between the two, mainly the difference between the seat, the soft seal is non-metal, the hard seal is metal.

4. Different manufacturing standards

From the principle point of view, hard seal ball valve and soft seal ball valve are the same, but because it is a seal between the metals, to consider the hardness relationship between the metals, as well as working conditions, what kind of media and so on. It is generally required to do hardening treatment, and continuous grinding between the ball and the seat to achieve a seal. Hard sealed ball valve production cycle is long, processing is more complex, hard sealed ball valve is not easy to do.

5, the difference in equipment selection

Soft, the selection is mainly based on the process medium, temperature and pressure, the general medium contains solid particles or has wear or temperature higher than 200 degrees, the diameter is greater than 50 valve pressure difference is also considered to open the valve torque size, torque should be used when the fixed hard seal ball valve, whether soft and hard seal its sealing grade can reach 6.

The above is the main difference between the soft seal ball valve and the hard seal ball valve, the specific purchase and use, need to be decided according to the actual use, the two are not good or bad, I hope that everyone in the choice of the actual use of various factors in the decision.