Valves and pipes general provisions and valves general materials Pipe type pneumatic valve by the actuator and regulating mechanism
1. When the outlet pipe diameter of the fire pump is greater than 300mm, the valve with single manual opening and closing function should not be used. Valve should have obvious open and close sign, remote control valve should have quick open and close function, and seal reliably. 2, normally open or normally closed valves should be equipped with locking device, control valves and valves that need to be opened and closed should be equipped with opening and closing indicators. The opening and closing signal of the control valve involved in the linkage control of the remote control gun system should be transmitted to the system control room.
General regulations for valves and piping
1, when the fire pump outlet pipe diameter is greater than 300mm, should not use a single manual opening and closing function of the valve. Valve should have obvious open and close sign, remote control valve should have quick open and close function, and seal reliably.
2, normally open or normally closed valves should be equipped with locking device, control valves and valves that need to be opened and closed should be equipped with opening and closing indicators. The opening and closing signal of the control valve involved in the linkage control of the remote control gun system should be transmitted to the system control room.
3. The valve on the dry powder pipeline should be ball valve, and its diameter must be consistent with the inner diameter of the pipeline.
4. The pipeline should be made of corrosion-resistant materials or the outer wall of the pipeline should be treated with anti-corrosion.
5, in the use of foam liquid, foam mixture or seawater in the appropriate position of the pipeline should be set up flushing interface. An automatic exhaust valve shall be provided at the top of the pipe section where air may be trapped.
6. A by-pass test interface should be set up after the foam proportional mixing device.
Gb valve commonly used materials general requirements
1) The materials of valve body, valve cover and flange shall be selected according to the service conditions and manufacturing requirements, and shall comply with the provisions of GB 12228, GB 12229, GB 12230 and GB 3077.
2) Bolt and stud materials can be A5, 25, 35, 30CrMoA and 40MnVB, etc., should be selected according to the use pressure and temperature, and should comply with the provisions of GB 700, GB 699 and GB 3077.
3) The nut material can be A3, 20, 30, 35, 45, 3030CrMoA and 40MnVB, etc., should be selected according to the use of pressure and temperature, and should comply with the provisions of GB 700, GB 699 and GB 3077.
4) Precision casting shall not be used for valves with nominal pressure PN10.0MPa.
5) Attention should be paid to graphitization of materials in the following situations:
A. Carbon steel at about 425¡æ;
B. carbon molybdenum steel is about higher than 470¡æ;
C. Chromium molybdenum steel (containing chromium below 0.6%) is higher than 525¡æ.
6) Attention should be paid to the possible peroxygenation reaction (oxidation skin) in the following situations:
A. 1CR-0.5Mo steel, 1.25 CR-0.5Mo steel, 2CR-1Mo steel and 3CR-1Mo steel, which are approximately higher than 565¡æ;
B. About 5CR-0.5Mo steel above 595¡æ.
Pipeline pneumatic valve is made up of actuators and regulating mechanism Pipeline in pneumatic valve using compressed air driven actuators of the combined group pneumatic piston movement, the force to beam and the characteristics of the curve track, drive tubular spindle rotation, compressed air disks to each cylinder, changed the direction of gas in and out of position to change the direction of spindle rotation, According to the load (valve) required rotational torque requirements, the number of cylinder combinations can be adjusted to drive the load (valve) work. &nb
Pipeline in pneumatic valve using compressed air driven actuators of the combined group pneumatic piston movement, the force to beam and the characteristics of the curve track, drive tubular spindle rotation, compressed air disks to each cylinder, changed the direction of gas in and out of position to change the direction of spindle rotation, according to the requirement of the load (valve) the required rotation torque, adjustable cylinder combination number, Drive the load (valve) to work.
Pneumatic valve which is equipped with double-acting pneumatic actuators, two is two position control, on-off, there are five tunnel ventilation, 45 is one connected with gas source, two external and double-acting cylinder chamber in and out of the port connection, two with the internal chamber in and out of the port in succession, you may refer to the working principle of concrete working principle of the double-acting pneumatic actuators. Due to the more and more ways and means of pneumatic valve control, there are many ways to control pneumatic actuators in actual industrial production and industrial control.
The pipe pneumatic valve is composed of an actuator and a regulating mechanism. The actuator is the thrust component of the regulating valve. It produces the corresponding thrust according to the pressure of the control signal to promote the action of the regulating mechanism. The valve body is the regulating part of the pneumatic regulating valve, which is directly in contact with the regulating medium to adjust the flow of the fluid.
Operation method:
1. The opening and closing direction of the pneumatic valve should be closed clockwise.
2. Because the pneumatic valve in the pipe network is often manually opened and closed, the opening and closing rotation should not be too much, that is, the large diameter valve should also be within 200-600.
3. In order to facilitate the opening and closing operation of one person, the maximum opening and closing torque should be 240N-m under the condition of plumber pressure.
4 pneumatic valve opening and closing operation end should be square tenon, and size standardization, and face the ground, so that people can directly operate from the ground. Valve with wheel is not suitable for underground pipe network.
Pneumatic valve is used in all walks of life, especially in water/sewage treatment, beer beverage, food processing, pharmaceutical and medical equipment, disinfection cleaning, and textile chemical industry and other fields is a big advantage and broad market prospects. Pipeline pneumatic valve used in analytical instruments, automobile manufacturing, biotechnology, chemical, electronics, energy, genetic engineering, semiconductor, cosmetics, food and beverages, beer industry, mechanical engineering, medical treatment, medicine and health care, textiles, packaging, water (sewage) treatment, satellites and space experiments, nuclear reactors, deep-sea exploration and other fields.
Post time: Sep-24-2022
