Part of the British hydraulic fittings By a combination of control valves, hydraulic components bi-directional lock, flat cut-off valve, check valve, safety valve, safety valve and pressure british hydraulic fittings measurement including high flow valves and other components of the British hydraulic fittings one-way valve. Infusion pipeline system consisting of a high pressure hose. Beams and roof beams dumplings before then, and supported by short column to the top of the beam as a fulcrum banjo bolt fittings, can be 15 degrees or swing to the 'Bu as 19 degrees upward, to improve the situation before contact with the roof beams, so close to the coal wall the roof can be effectively supported, avoiding produced before the end of the roof and cut the top of the phenomenon of channeling partings. In front bezel with anti-chip and jacks composed by the help devices. Necessary work, and can extend the anti-spalling and coal wall close to the device can also be retracted to chinapneumaticcylinders allow British hydraulic fittings shearer drum passed. Top beam is the main component of the bracket bearing, front and front beam pick dumplings, dumplings beam rear end of the cover and then cut the top plays a role in the web of welded nest with four columns, connected with the ball joint stud, two side mounted retractable side guards for block partings and anti-down purposes. Due to its direct contact with the top plate, it requires a sufficient area, and requires a sufficient strength. Cover the top of the beam by the hinge pin and roof beams, the lower end of the connecting rod and the base by four dumplings then, its main role is to bear the roof to give the horizontal component bracket, so the column from lateral bending loads, and to prevent caving Advantech stone fleeing stent to ensure the safety of persons and equipment.