Technical Articles

C. The diver operation When the water is not deep, the valve of the submarine pipeline is usually equipped with a hand wheel. Divers can operate the valve of the submarine pipeline by the air diving method. In addition, for submarine valves with ROV interfaces, divers can also use special operating...

The Overview With the rapid development of the offshore oil and gas industry and the demand for energy, the development of oil and gas fields in the deep water will become the focus of development of the offshore oil industry in the future. The manufacturing system of submarine oil and gas is hardly...

The appearance of the ball valve was in the 1950s. With the rapid development of science and technology, manufacturing processes and structures of ball valves have improved gradually. Ball valves have rapidly developed into one of the main valves in a short period of 40 years. In China, the ball valve...

The difficulty of designing and manufacturing the safety valve How to ensure accurate popping, good mechanical property, effective sealing and steady discharging of safety valves involves many basic subjects such as hydrodynamics, structural mechanics and mechanics of materials. In addition, mathematical...

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 processes,...

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 force...

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 gasket...

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 corrosive...

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...

(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...

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 by...

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....