1. at room temperature and low pressure, choose non-metal soft gasket, medium pressure and high temperature, choose metal and non-metal combination gasket or metal gasket; When the temperature and pressure are relatively stable, the elastic or self-tightening gasket is selected; The presence of specially functioning gaskets should be considered in the presence of low temperature, corrupt media or vacuum.
2. soft seal gate valve request is not high occasion, can be selected by lesson, not suitable for replacement.
3. for those requests for strict occasions, such as explosive, highly toxic and combustible gas and strong corruption of liquid equipment, reaction tank with pipeline system, etc., should be based on the working pressure, working temperature, the corruption of the sealing medium and the combination of sealing surface situation to choose, silica gel sealing ring has an open porous structure, can absorb many substances, is a good desiccant, Adsorbent and catalyst support. The adsorption of silica gel is mainly physical adsorption, can be regenerated and repeated use. Add acid in alkali silicate (such as sodium silicate) solution, acidize it, and then add a certain amount of electrolyte to stir, that is, to produce silicate gel, or add acid or ammonium salt in the concentrated sodium silicate solution can also produce silicate gel. Silica gel products with silica gel as the main raw material of processing works, are known as silica gel products, silica gel is made of silica gel proper dehydration of porous material of different particle sizes, has an open porous structure, can absorb many substances, is a good desiccant, adsorbent and catalyst carrier.
Soft seal gate valve with pressure to replace the O-ring:
1、If it is the middle flange sealing gasket, the individual need to relieve pressure first, and the rubber O-ring repair kit can be replaced by removing the valve cover (as for the sealing gasket, it is possible to repair online with pressure)
2、if it is the valve stem seal ring, it is necessary to open the valve to the full open position, so that the reverse seal may ensure that the medium will not leak, and then replace the valve stem seal ring, soft seal gate valve pressure individually in 1.6MPa-. Silica gel products with silica gel as the main raw material of processing works, are known as silica gel products, silica gel is made of silica gel proper dehydration of porous material of different particle sizes, has an open porous structure, can absorb many substances, is a good desiccant, adsorbent and catalyst carrier.
3、If it is a soft sealing seat, the valve must be removed before it can be replaced.
Post time: May-08-2023
