Should pay attention to this kind of structure there are several shortcomings, because the diaphragm is bigger, the big bright can exist problem of weight and height, installed on the smaller size of the Industrial Valves, in particular, this will lead to in the small valves and excessive stress of the junctions between the executing agency problem. Because of the diaphragm elastic contraction, its stem is limited. Compared with other types of actuators, a little short. A special working condition of valve core question, this condition will take a long trip to provide the flow characteristics of special or through other Industrial Valves core facilities provide larger flow. Most of the diaphragm actuator stroke is 2 in ( 5. lam) Or less, although in some special conditions may be ia (4 10. 2cm) The itinerary. The diaphragm itself is the chief drawback of thrust and air pressure. Because of the force created by the diaphragm actuators is proportional to the actuator size, total cost of the need of high thrust shape size is limited by the size of the diaphragm. Most of the diaphragm rated operating pressure for 20 ~ 30 PI ( 1. 4 - 2. 5har) So that limits the amount of thrust air pressure acting on the diaphragm. For example, the size of 125 diaphragm actuator, its operating air pressure of 30 psi ( 2. 1bar) , can produce the maximum thrust of 3750 ib ( 1700 kf) 。 So there is only one way to improve the thrust increases the diaphragm size, it will use a larger actuators and air chamber. And the actuator itself. Larger volume and produce hinge slow speed and reduce the total actuator response. Diaphragm air pressure conditions, requires the use of regulator, because most factories supply air pressure is between 80 ~ 12 spsi ( 5. 5 - 8. 6) between the har 。 If the diaphragm is able to withstand high pressure, the amount of thrust in the above example will be significantly increased to 10000 ib ( 4400公斤) Thrust. Unfortunately there is no developed can provide that strength and can provide the needed back stretch so that movement of the diaphragm material in the whole trip. Diaphragm actuator thrust conditions with the structure of the valve diaphragm actuators can be used to solve, the valve structure can balance the flow conditions in the process, such as double seat valve or pressure balance valve core, these costs can be offset by the use of smaller actuators. Small, in short, for diaphragm actuators, due to the constraints of the diaphragm, cannot provide the deviation resistance, abnormal fluctuate process content panic problems will occur. When the throttle valve seat when it close to won't have problems, i. e. it does not have enough power to prevent the closure components were inside the seat. Diaphragm actuator deviates from the resistance value is generally constant in the whole trip:. When close to the seat closure components, a sudden change in the process content or water hammer effect resulting from the fluctuation will cause the valve closed.

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