Select the valve seals face materials shall be taken into consideration when what factors

Select the valve seal face material should be <a href="http://www.electricslipring.com/revolving-joints.html">revolving joint</a> consider the following factors:
(1) corrosion. "Corrosion" that is under the action of sealing surface in the media, the surface damage of the process. If the surface of this damage, sealing can't assure, therefore, seal face materials must corrosion. The material corrosion resistance of the mean depends on the material and the extreme chemical stability.
(2) scratch resistant. "Scratch", that is, the seal faces relative motion process, because of <a href="http://www.electricslipring.com/through-bore-slip-rings-rotaryjoint-rotary-joints.html">through bore slip rings</a> friction material and cause damage. This damage must cause the destruction of the sealing surface, therefore, seal face materials must be of good scratch resistant performance, the institution is a gate valve. Scratch resistance of the material sex is often of material internal properties of the decision.
(3) corrosion proof. "Erosion", that is, high speed flows through the medium sealing surface, make the destruction of sealing surface process. This kind of destruction in high temperature and high pressure steam medium the throttle valve and relief valve use is more evident, and the influence of sealing failure, therefore, corrosion proof is also one of the important requirements of sealing surface material.
(4) should have a certain degree of hardness, and provisions for operating temperature of the big drop occurred in the hardness.
(5) seal face and body materials should be steels are similar, with the structure of the <a href="http://www.electricslipring.com/miniature-slip-rings.html">Miniature Slip Rings</a>  is more important, in order to avoid the high temperature easy to generate additional stress and cause loose.
6 in high temperature condition use, want to have enough antioxidant, thermal fatigue sex and thermal cycle.
In the present situation, to <a href="http://www.electricslipring.com/capsule-slip-rings.html">Capsule Slip Rings</a> meet the requirements of the overall find sealing surface material is very hard to do, can be according to different valve class and use, key meet certain requirements. For example, in the medium of the valve should pay special attention to <a href="http://www.electricslipring.com/">slip ring</a> using the sealing surface corrosion proof requirements; and in the medium containing solid impurity should choose hardness higher sealing face of the material.