The pairing pneumatic valve seal materials commonly used

the pairing pneumatic valve seal materials commonly used are as follows: (1) soft seal pair: soft sealing surface material with hard material suitable, generally by the pneumatic valve pneumatic valve sealing surface for the soft material, pneumatic valve seat sealing surface as hard material; Pneumatic valve and pneumatic ball valve pneumatic brake valve seat sealing surface for the soft material, ram and sphere for hard sealing surface. (2) copper alloy sealing surface matching: GB/T - regulation, pneumatic valve pneumatic brake valve seal USES ZCuZnMnPb or ZCuAlFe; ZCuZnSAlFeNi or ZCuAlMn disc sealing ring is adopted. (3) chromium stainless steel seal pair: Cr - commonly used medium pressure pneumatic valves Crt Cr - Cr( Poor hardness HRc ~; Cr - high pressure pneumatic valves Cr( Hardness difference of HRC ~. To improve the matching method of Cr system for nitrogen. (4) other materials seal pairs: according to the information about the pneumatic valve test conclusion and pneumatic valve manufacturing and use of the experience, recommendations for pneumatic valve seal materials chosen for some matches