亚洲国产成人精品久久久综合99久久精品国产成人福利一区二区三区中文字幕_国产精品亚洲综合91久久久久久一级乱黄网站_国产一级a毛一级a免费看视频_国产精品高呻吟久久久久AV无码_久久午夜无码人妻鲁丝片午夜精品_а√在线官网在线_国产欧美日本韩国高清视频一区二区三区免费在线

Z23X-35 series mud gate valve is mainly used in oil well mud circulation system equipment, used to control the circulation and closing of the mud, the connection type is trapezoidal pattern connection, quick and easy installation, rigidity, safe and reliable, the valve seat and the gate valve adopt parallel type elastic seal,Sealing effect is good, open light.The valve ends are connected with the pipeline seal; the use of spherical contact, and O-type rubber ring combined activities of the street with the installation of both ends of the straight pipe is not demanding and good sealing performance.