Use of soft and hard seal ball valve is different, mainly structural, different standards to the manufacture of the valve.

    The mechanism of the structure

    Valve seal is a seal between the metal and metal sealing ball and seat are metal. Precision and difficult process, generally used in high pressure, usually more than 35MPa. Soft seal is a seal between metal and non-metallic, such as nylon \ PTFE, manufactured by the same criteria.

    Sealing materials

    Hard and soft sealing material is sealed in terms of seat, seat seal material is precision machining, assurance and spool (sphere) and with precision, generally stainless steel and copper. Soft seal is mounted on the seat of the sealing material for non-metallic materials, because of the soft sealing material have a certain flexibility, so the machining accuracy will be lower relative to seal.

    Manufacturing process

    Since many of the chemical industry, machinery industry, the working environment is complex, many of which are high temperature and pressure, the frictional resistance of big media, corrosion, and now technological progress, and a variety of materials, better use, and processing and so can tell on, giving the seal of the valve are widely promoted.

    In fact, Ball Valve and soft sealing principle is the same, just because it is sealed between the metal, taking into account the hardness of the metal between the relations and working conditions, taking what the media and so on. Hardening are generally asked to do, to keep between the ball and valve seat grinding to reach the seal. Ball Valve long production cycle, processing is more complex, not easy to do the hard seal ball valve.

    Use conditions

    Soft Seal General Seal to achieve high, while the seal will have high or low on request; soft seal need fire, because at high temperatures, the soft seal material will leak, and the seal is not the problem; seal generally can do very high pressure, the soft seal is not; soft sealing problems because the media stream, can not be used on some occasions (such as some corrosive medium); final seal valves generally more expensive than the soft seal. As for manufacturing, the difference is small, the main difference is the seat, the soft seal is a non-metallic, hard seal is metal.