Check And Non Return Valve

Product Information：

This Check and Non Return Valve is a brass ball valve under IFAN. Its ball center is made of brass, which is the shorter one of our brass check valves. Check and Non Return Valves are usually used with stainless steel filters.

Check and Non Return Valve is used in the pipeline system, its main function is to prevent the backflow of the medium, prevent the reverse rotation of the pump and the drive motor, and the discharge of the container medium. Check and Non Return Valve can also be used on pipelines where the pressure may rise above the system pressure to provide supply to auxiliary systems, which can be mainly divided into swing type (rotating according to the center of gravity) and lift type (moving along the axis).

Product Size：

Product Features:

Use and maintenance of Check and Non Return Valve: The newly installed Check and Non Return Valve should have a product qualification certificate, there should be no blisters, pores or cracks in appearance, the packing gland should be pressed flat, and the switch should be flexible; if necessary, it should be carried out before the new valve is installed. Pressure test; the pressure and temperature grade of the valve used should be consistent with the working pressure of the pipeline, and the low-pressure valve should not be installed on the high-pressure pipeline; the valve should be turned back half a circle after opening to prevent it from being closed by mistake; when the valve is closed, special Wrench, try to avoid using pipe wrench, do not use too much force or use tools to close the valve too much; the valve packing, cover, flange, thread and other connections and seals must not leak, if any problem is found, it should be tightened or Replacement, do not operate under pressure during replacement, especially for high temperature and corrosive media to prevent injury to people; outdoor valves, especially rising stem gate valves, should be covered with protective sleeves to prevent rain and snow erosion and dust and rust. For valves used in water, steam, and heavy oil pipelines, antifreeze and heat preservation work should be done in winter to prevent the valve body from freezing and cracking; before the automatic valves such as pressure reducing valves, regulating valves, and steam traps are activated, the pipelines should be installed. Rinse clean. For traps without bypass and flushing pipes, the traps should be removed, and the pipes should be blown out before they are installed for use. Steam and water shocks. When the valve is fully opened, the handwheel should be reversed by half a turn to make the threads tight. The water valve and air valve that have been closed for a long time should pay attention to remove the accumulated water; the Check and Non Return Valve should be kept clean, and the valve should not be used to support other heavy objects, let alone stand on the valve; the valve body and handwheel of the valve should be According to the management requirements of process equipment, do a good job of painting and anti-corrosion. The valves on the system pipeline should be numbered according to the process requirements, and the number should be listed when opening and closing the valve to prevent misoperation.

Valve selection:

In addition to Check and Non Return Valve, the selection of some valves: there are many types of valves, the nature of the medium, the working pressure and working temperature and the range of change, the diameter of the pipeline and the special requirements of the process (throttle, decompress, vent, stop, etc. should be considered when selecting). (return, etc.), valve installation location and other factors, select the corresponding one based on the basic principles of "meeting the process requirements, safe and reliable, economical and reasonable, and convenient for operation and maintenance".

For pipelines with two-way flow, non-directional valves, such as gate valves, ball valves, and butterfly valves, should be selected; for pipelines that only allow one-way flow, Check and Non Return Valve should be selected; for places where flow needs to be adjusted, multiple throttle valves should be selected , globe valve can also be used when precise adjustment is not required; ball valve or butterfly valve should be used for pipelines requiring rapid opening and closing; gate valve or ball valve should be used for pipelines requiring good sealing; for pressure vessels and pipelines, set according to their specific conditions safety valve. For various gas cylinders, pressure reducing valves should be installed at the outlet; steam heating equipment and steam pipelines should be installed with traps; on oil and petroleum gas pipelines, in terms of connection form, flanged valves should be used. Valves with threaded connections are only used in pipes with a nominal diameter of less than or equal to 25mm; as far as the material of the valve is concerned, gate valves with a nominal pressure of less than or equal to 1.0MPa or globe valves with a nominal pressure of less than or equal to 1.6MPa should be selected as little as possible.