characterized
    (1) three flow path design, a work to install two of the same safety valve, one of the online overpressure protection, and the other as a maintenance spare.
    (2) change to the system operation safe, easy, fast.
    (3) fast switching without a plant shutdown, continuous overpressure protection, to avoid the loss of the high cost of emergency parking maintenance.
    (4) below in each safety valve, equipped with an escape valve for safe and effective escape the media in front of the safety valve to be demolished, and the introduction of the discharge pipe.
    (5) fast switching device with balancing valve, which is easy to operate.
    (6) applies to a wide temperature range (low to high temperature).
    (7), reliable sealing, many times the action and still maintain the desired tightness