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  • Posted: 09/25/2014 04:09:10  Clicks: 674
    Gas valves are a type of compulsive sealing valves. Nevertheless, when closing valves, pressure should be applied on disc in case of leakage in compulsive sealing. When medium enters into body through the bottom of disc, resistance which should be overcome is the thrust caused by friction between stem and packing and...
  • Posted: 09/30/2014 03:09:30  Clicks: 709
    The followings introduce classification of oil valves in common use.   1. Gate Valves Gate valves also called as paddle valves, are one of commonly used valves. The sealing faces of disc and seat have high smoothness and same roughness. They fit each other to prevent medium from flowing through. Using pattern...
  • Posted: 12/04/2014 03:12:32  Clicks: 714
    The disc of high pressure check valves is discoid, which rotate with a spindle inside channel of seat. Because of the channel is streamline form. Flow resistance of high pressure check valves is lower than that of butterfly check valves. High pressure check valves are suitable for large diameter pipelines where flow ...
  • Posted: 12/10/2014 04:12:35  Clicks: 701
    Check valves, also called as one-way valves or non-return valves, are used to stop media from flowing backward. Bottom valves in water shut of water pump also belong to check valves. Headstock piece depends on media flowing and power to open or close automatically, in order to prevent backflow. Check valves are a typ...
  • Posted: 12/18/2014 03:12:05  Clicks: 579
    Globe valves, also called as stop valves, use a plug as disc. The sealing face is plane or cone. The disc makes rectilinear motion along with the center line of fluid. According to motion form of stem, globe valves can be classified into non-rising stem globe valves and rising stem globe valves. For globe valves only...
  • Posted: 12/24/2014 03:12:15  Clicks: 642
    Pneumatic ball valves develop from plug valves. Pneumatic ball valves can also be rotated 90 degrees, the same as plug valves. The difference is that ball valves use a ball as their cock. A hole exists on ball or passageway crosses through axis of ball. When ball rotating 90 degrees, both intake and outtake should sh...
  • Posted: 12/31/2014 02:12:20  Clicks: 666
    Reasons causing sealing faces of valves damage can be classified into factitious damage and natural damage. Factitious damage includes culpable design, unskilled manufacturing, improper selection, inappropriate installation, misuse and lack of maintenance. Natural damage is the abrasion under the condition of valves ...
  • Posted: 01/28/2015 02:01:57  Clicks: 643
    Motive seal of valves mainly means stem seal. Media inside valves cannot leak out with stem moving. It is also the center of motive seal of valves. Currently, motive seal of valves is mainly with stuffing box. Basic form of stuffing box is classified into gland and gland nut.   1. Gland Gland is in common ...
  • Posted: 02/05/2015 02:02:19  Clicks: 637
    Usage of stream extraction check valves Stream extraction check valves are mainly used for stream extraction system in power plants or thermal power plants. The vales are also used for non-corrosive media such as steam and water. Stream extraction check valves prevent fatality that pressure inside turbine drop sudd...
  • Posted: 02/11/2015 03:02:58  Clicks: 665
    Design of ball valves used in pipelines requires high safety and reliability. The idea should be implemented in the whole process, including design, process specification, parts processing, type testing, product testing, quality control and after sales. Both long pipelines and urban pipelines nets are energy supply l...
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