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    High and low pressure pneumatic control system
    91.
    发明授权
    High and low pressure pneumatic control system 失效
    高低压气动控制系统

    公开(公告)号：US3556399A

    公开(公告)日：1971-01-19

    申请号：US3556399D

    申请日：1969-04-02

    申请人： ROBERTSHAW CONTROLS CO

    发明人： PUSTER LOUIS M ,  CALDWELL EDWARD N

    IPC分类号： F15B11/08 ,  F24F11/00 ,  G05D23/185

    CPC分类号： F24F11/00 ,  F15B11/08 ,  F24F11/30 ,  F24F2110/10 ,  Y10T137/2365

    摘要： A pneumatic control system having a source of control fluid providing two different control pressure levels for respectively switching the control device of the system from one operating condition thereof to another operating condition thereof, the control device comprising a pair of condition controller means each having a sensor and a bleed-type pneumatic valve operated thereby together with relay means operatively interconnected to the source for directing a branch signal of the control fluid to a pneumatically operated device in relation to a pilot signal directed to a pilot chamber of the relay means by one of the control means. First and second passage means are adapted to respectively interconnect the source to the valves of the control means, a pressure responsive means being disposed in the first passage means for preventing fluid communication therethrough when the source is at one pressure level and permitting fluid communication therethrough when the source is at its other pressure level. A switching means is provided in a third passage means and has one position for interconnecting only the second passage means to the pilot chamber whereby the pilot signal for the relay means is provided only by one of the controller means and having another position for interconnecting only the first passage means to the pilot chamber whereby the pilot signal or relay means is provided only by the other controller means.