FIELD: machine building.
SUBSTANCE: valve switching device contains hollow case whereto there are connected two lines of low pressure by means of branches and safety valves. Gas medium lines are connected to branches. A high pressure line is connected to a cavity of the case. A valve supplying pressure to one of safety valves and shutting off the second safety valve is installed in the cavity of the case on a movable rod. Cases of two pistons are arranged on end sides of the hollow case. One of the cases is split. The valve and both pistons are secured on a common rod passing through the hollow case and both cases of the pistons. A replaceable circular insertion is set in the split case of the piston. The piston in a chamber with the insertion is also split. Lines of control pressure are connected to each piston case on both sides of the piston. There are disclosed versions of design of valve switching device.
EFFECT: increased reliability of devices operation.
11 cl, 3 dwg
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