... sulfur gas production wellhead consists of bottomflange, upper flange, tubing head, brake valve, needle valve, small cross valve,shutoff valve, bearing ... ,EE,FF Rated Working Temperature: K,L,P,R,S,T,U,V Whole connection mode: flange, clamped in style Medium ... valve , wedge brake valve Product Specification Level: PSL1~PSL4 Tubing head