Technical Articles
  • Basic Knowledge of Safety Valves (Part Two)
    Posted: 09/22/2017 14:52:20  Hits: 4
    Notes for installation and use of safety valves Safety valves belong to precision mechanical instruments, and safety valves' installation and operating requirements are high. For the continuous process industry, a set of device needs to go through purging, airtight and pressure test several proc...
  • Basic Knowledge of Safety Valves (Part One)
    Posted: 09/08/2017 16:31:51  Hits: 9
    High temperature, high pressure, flammable, explosive and other continuous production operation fields have very high requirements of safety valves' service lives, safe operation and stability. The safety valve is a kind of the intrinsically safe protective measure and is operated by spring for...
  • Common Breakdowns of Valves (Part Two)
    Posted: 08/26/2017 17:31:20  Hits: 6
    4. Adopting the lens gasket For the sealing of the upper and lower bonnets, the valve seat and the upper and lower valve bodies, if the seal is the flat seal, the sealing performance will be poor under high temperature and high pressure, resulting in outer leakages of valves; we can use the lens gas...
  • Common Breakdowns of Valves (Part One)
    Posted: 08/12/2017 15:17:57  Hits: 4
    Valves are only small parts in factories. However, once there is a breakdown of them, it can cause a lot of trouble. Which part should we check when a breakdown of the valve happens? 1. Inner walls of valve bodies  For regulating valves used in places with high pressure differences and corrosi...
  • Eleven Principles and Precautions for Valve Pressure Tests
    Posted: 07/21/2017 17:30:39  Hits: 8
    Valve manufacturing is a complex yet simple process. Production cycles of ordinary valves such as gate valves, ball valves, globe valves, butterfly valves and check valves are generally three days. The finished valves must go through a variety of performance tests, and the most important test is the...
  • Common Sealing Characteristics of Valves' Clacks and Seats (Part Two)
    Posted: 06/28/2017 13:41:37  Hits: 12
    (2) Semi-forced seal: Valves which have the characteristic of semi-forced seal are mainly trunnion mounted ball valves and non-mechanically balanced plug valves. These valves have the characteristic that the sealing pressure between the valve clacks and the valve seats is preset and is generated or ...
  • Common Sealing Characteristics of Valves' Clacks and Seats (Part One)
    Posted: 06/09/2017 15:26:58  Hits: 7
    The shut-off seals of valves can be divided into three categories: forced seal, semi-forced seal and passive seal. A. Forced seal: The sealing pressure of forced seal can be increased by the further rotation of hand wheels. B. Semi-forced seal: The sealing pressure of semi-forced seal is generated b...
  • Common Breakdowns and Solutions for Safety Valves
    Posted: 05/26/2017 13:29:00  Hits: 14
    When we use and check safety valves, breakdowns always happen, which are mainly caused by the improper design, manufacturing, selection or use. If these faults are not promptly cleared, they will affect functions and service lives of safety valves. Common breakdowns and solutions are as follows: 1....
  • Reasons and Resolutions for Leakages of Safety Valves
    Posted: 05/17/2017 14:55:03  Hits: 20
    Leakages beyond nominal range occuring in the parts between safety valve clacks and seats which should be sealed will result in losses of media and damage of sealing materials. Generally, sealing surfaces of safety valves are made of metal materials and are made to be smooth and even. However, it is...
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