Xinming introduces you a small encyclopedia of pneumatic valves
Pneumatic valves are valves driven by compressed air. When purchasing pneumatic valves, only clear specifications, categories, and pressures can be used to satisfy the requirements of the acquisition. It can be used to manipulate various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media. flow.
At that time, the business economic environment was imperfect. Because pneumatic valve manufacturers, in order to compete with their products, each carried out different innovations under the concept of unified planning of pneumatic valves, and formed their own corporate specifications and product individualities. Therefore, it is necessary to make detailed technical requirements when purchasing pneumatic valves, and to achieve harmony with the manufacturer, as an accessory to the pneumatic valve acquisition contract. This type of valve should generally be installed horizontally in the pipeline.
Operation principle: Use compressed air to propel the movement of multiple sets of combined pneumatic pistons in the actuator, transfer force to the beam and the characteristics of the inner curve trajectory, drive the hollow main shaft to rotate, and the compressed air disc is sent to each cylinder to change the direction of the air inlet and outlet. Change the rotation direction of the main shaft, and adjust the number of cylinder combinations to drive the load (valve) operation according to the requirements of the load (valve) rotation torque. The two-position five-way solenoid valve is generally used in conjunction with a dual-effect pneumatic actuator. The two-position is controllable in two positions: on-off. The five-way has five channels for ventilation, of which one is connected to the air source, and two are connected to the double The air inlet and outlet of the external air chamber of the effect cylinder are connected, and the two are connected with the air inlet and outlet of the internal air chamber. The specific operating principle can refer to the operating principle of the dual-effect pneumatic actuator. Because there are more and more control methods and means, there are many methods used to control pneumatic actuators in the practice of industrial life and industrial control. The following are commonly used.
Intelligent display instrument Intelligent display instrument is an instrument used to monitor the operation of the valve and control the operation of the valve during the period of operation. It monitors the operation of the valve through two-way position sensors, and judges whether the valve is open or closed. It is recorded by programming The number of the valve switch, and there are two 4-20mA outputs corresponding to the valve opening and two-leg normally open and normally closed output contacts. Through these output signals, the opening and closing action of the valve is controlled.
Control system PLC is more and more widely used in the control system, because this solution is developed on the OMRON PLC, so the OMRON PLC is used for the introduction.
Hardware composition: 1 computer, 1 set of PLC (including CPU, I/O module, ID212, OC224, AD003 module), 2 relays, 2 solenoid valves, 1 pneumatic valve actuator.
General requirements 1. The specifications and categories of the produced pneumatic valves shall meet the requirements of the pipeline planning documents. Pneumatic valve (11 photos) 2. The type of pneumatic valve should be marked according to the national standard number requirements. If it is an enterprise specification, the relevant clarification of the type should be indicated. 3. The operating pressure of the pneumatic valve must be greater than or equal to the operating pressure of the pipeline. Under the premise of not affecting the price, the acceptable operating pressure of the valve should be greater than the actual operating pressure of the pipeline; when the pneumatic valve is closed, any side should be able to accept 1.1 times The valve working pressure value does not leak; when the valve is open, the valve body should be able to accept the requirement of twice the valve working pressure. 4. Pneumatic valve manufacturing specifications should state the national standard number on which it is based. If it is a corporate specification, the purchase contract should be accompanied by corporate documents.
