Pneumatic valve small knowledge: soft and hard seal ball pneumatic valve

what is the difference between hard seal and soft seal?
in various types of pneumatic valve, there are two types of difficult to distinguish, hard seal ball pneumatic valve with soft seal ball valves, although the two are our common pneumatic ball valve, but they have many differences, tianjin ZuYao pneumatic valve to introduce it to everyone.
, structure, mechanism of
in general, pneumatic ball valve, hard seal refers to sealing between metal and metal, metal sealed ball and pneumatic seat are. And soft seal is the contact of two sealing surface can be individually, can all use soft material.

different, sealing materials are generally cases, hard seal ball pneumatic valve is the use of pneumatic seat materials precision machining, assurance and pneumatic valve core ( Sphere with the precision, generally have stainless steel and copper. And soft seal is set in the pneumatic seat sealing material for non-metallic materials, because of the soft sealing material has certain elasticity, therefore hard seal will be relatively low demands on machining accuracy.
and the different conditions of use
in terms of use, general soft seal can achieve very high, while hard seal according to the requirements can be high to low; Hard seal generally can do high pressure, soft seal is not; Soft seal need to fire prevention, because at high temperatures, soft sealing material will leak, and hard seal is not the problem; Soft seal due to the problem of flow medium, some occasions is can't use, Such as some corrosive medium; The last hard seal generally more expensive than soft sealing pneumatic valves. In manufacturing, both difference is not big, mainly is the difference between pneumatic valve seat, non-metallic, soft seal is is metal hard seal.
, manufacturing standards in different
in principle, hard seal ball pneumatic valve with soft seal ball valves are the same, only because is the sealing between metal and to consider the relationship between the hardness of metal, as well as the working condition, what medium, etc. Are generally required to do hardening treatment, between the ball and pneumatic seat to grinding to the seal. Pneumatic valve production cycle is long, hard seal ball processing is more complex, hard seal ball pneumatic valve is not easy to do.
and equipment selection of
soft and hard seal ball pneumatic valve is chosen mainly according to the process medium, temperature and pressure, average temperature wear or the medium containing solid particles or above degree had better choose hard seal, diameter greater than the pneumatic valve pressure difference is bigger also consider open pneumatic valve torque size, large torque should be chosen when fixed pneumatic valve, hard seal ball seal level for both hard and soft seal can be achieved.
that is soft sealing ball pneumatic valve and hard seal ball valve, the main difference between the specific use of choose and buy, need according to the actual usage decision, both no good, hope you seriously consider when choosing the actual use of the various factors in decision making.