上密封座设计
) G! N5 d! b9 @2 r- R! u4 X
, X. S* n3 p! ?我公司提供的所有截止阀都有倒密封设计。通常情况下,碳钢截止阀的阀座设计采用分离式倒密封结构 ,不锈钢截止阀的倒密封是直接加工或者是焊后加工。当阀门在全开位置时,倒密封的密封面非常可靠。虽然按照标准 API 600中有倒密封,但这不作为在带压情况下更换填料的依据。
4 y, r" e; w! ]( {. k. L
8 O/ r8 E* U* @/ ?* ^1 `0 P/ vBack Seating Design
9 G0 Z. n3 _" N5 S: y- l/ `5 j) U2 N$ ?1 w; d! ^- E
All ur globe valves have the back seating design.ln most Cases,the carbon steel globe valve is fitted with a renewable back seat,For stainless steel globe valve,the back seat is machined directly in the bonnet or is machined after welding.When the globe valve is at fully open position,the sealing of the back seat can be very reliable.However,as per the requirement of API600,it is not a dvisable to add or change packing by the mean of back seating when the valve is pressure containing. |