What is the eight-character valve?

Eight-character valve

/me? tn = baiduimage & ampct=20 1326592。 cl = 2 & amplm=- 1。 fr = & amppv = & ampic=0。 z = 0 & ampse = 1 & amp; D6 % B7 % A7+& amp; s=0

angle valve

/me? tn = baiduimage & ampct=20 1326592。 cl = 2 & amplm=- 1。 fr = & amppv = & ampic=0。 z = 0 & ampse = 1 & amp; B7 % A7 & amp; s=0