main characteristics of pneumatic diaphragm valve:

1, pneumatic diaphragm valve categories: house type diaphragm valve, globe valve diaphragm, through dc diaphragm valve, diaphragm valve, rectangular diaphragm valve and gate type diaphragm valve the six kinds of products. Connection is commonly flange connection, the Industrial Valves open means common for handwheel turning, electric and pneumatic rotation.

2, valve industry of rubber or plastic material in the production of diaphragm, sealed performance is good. Better diaphragm is convenient, the cost is low.

when using feedback amplifier to improve the overall response of the actuator, can install tee feedback amplifier, it supplies or discharge air pressure to the actuator - Side. Tee feedback amplifier installed on the yoke of the actuator chest or integrally installed within the actuator, as shown in figure 5. 11. There are several size diaphragm actuator. Each size with different area of the diaphragm and several fan won spring options. A given thrust every one size range, the thrust to overcome technological force, friction force, gravity and spring force. Actuator size and industrial relations line size is less than the relationship with the operating conditions. Regardless of the valve is used to - Condition or throttling conditions close to the actuator size has an effect. For the diaphragm actuators, instrument signal can extensive changes to adapt to the dynamic condition. Although 3 ~ ISpei ( 0. 2 - 1. 0ba) Is considered to be standard, diaphragm actuator signal range can be high to pei in 3 ~ 27 ( 0. 2 to 1. 9 ber) Or 6 ~ 30 psi ( 0. 4 to 2. Ibar) 。 Diaphragm actuator size depends on the area of the diaphragm ( i1) 。 For example, the size of 125 its diaphragm actuator area of I2Sin2.

the main advantage of the diaphragm actuator manufacturing cost is cheap and can be widely used in the process industry. Although on the need of high thrust is restricted, they are well adapted to a part of the operation condition of the low pressure range ( The requirement for thrust is not as high) 。 One-way function of basic structure and operation method is easy to learn. Because of the signal can be easily drive actuator, without the need for additional feedback amplifier and the cost of the pipeline. No feedback amplifier, so there is no involves the alignment of process and equipment of the agency problem. Do not use feedback amplifier are:

means that reduces the movement parts ( Such as feedback amplifier to the actuator of the connecting rod) Involved may result in potential maintenance problems. When using the linear motion of valve, actuator rod of all movement is directly transferred to the valve closure components. Because there is no strict dynamic seal diaphragm ( For example, 0 ring) And don't need to be in the process of tuning a Yi power provides immediate and accurate response. In short, the diaphragm actuator for precision, the operation condition of the transposition is the ideal; Immediate response is important; Actuators using medium to low thrust to overcome the force of technology and the valve.

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