1, Technology

     By the heavy hammer-type butterfly brass ball valve butterfly valve body, linkage hydraulic bypass valve, a heavy hammer, the release device, manual pump (or electric pump), fuel tank rack transmission and electronic control components (see Figure 1). Pressure from the oil pump drive tanks enter the rack, the rack by the Pistons to promote butterfly rotation axis of the gear to open the butterfly plate, and coaxial cite the heavy hammer. Weights through the release of the pawl of the locking device lock spindles Spindle; lock spindle axis is fixed, care and support by the electromagnet to control the device. When the time of the accident, as part of electronic control movement, electro-magnet power, out of control Spindle lock in under the weight of the self-release spin axis, so that self-closing valves.

Figure 1 Principle of a heavy hammer-type brass angle valve action indicated

     The butterfly valve of the hydraulic system to control the use of bis cutting butterfly valve closing speed, turn off the start of faster time to reduce the speed and rate of the sustained rise; the closure of the slow phase to control the rate of increase in water pressure. Fluid control principle as shown in Figure 2.