3-Way & 4-Way Plug Valves
- Aug 14, 2019
- Hits: 54
3-way, 4-way plug valves are applicable to change the media flowing direction or to distribute the media, that are used in various industries such as petroleum, chemical industry, pharmacy, chemical fertilizer,...
The Reasons for the Aging of Rubber Seals
- Aug 07, 2019
- Hits: 23
Rubber seals are widely used in the valve sealing, for their excellent properties such as waterproof, flame retardant, high temperature resistance, electrical conductivity, wear resistance and oil resistance....
The Advantages of V-type Ball valves
- Jul 31, 2019
- Hits: 15
The V-type ball valve combines the optimal control characteristics of the ball valve and the butterfly valve. Its development is closely related to the advancement of technology. Today, the product is...
Welded Ball Valves
- Jul 24, 2019
- Hits: 50
Dervos received many inquiries about welded ball valves before, so today I would like to talk something about fully welded ball valves in China. National Energy Oil and Gas Document [2009] No.136 states...
Valve common fault and troubleshooting methods
- Jul 17, 2019
- Hits: 19
During the use or installation of the valve, internal leakage may occur. Due to frequent switching during use, or failure to install as required, the valve may not work properly. The cause of the leakage...
Installation and maintenance method of ball valves
- Jul 10, 2019
- Hits: 36
Ball valve installation: 1. It must be confirmed that the pipeline and trunnion mounted ball valve have been cleaned before operation. 2. The actuator operation of the valve drives the rotation of the...
What are the advantages and disadvantages of extended stem/bonnet?
- Jul 03, 2019
- Hits: 281
When we mention Cryogenic Valve, usually it refers to those suitable for service temperature from -46 °C to -196 °C, where extended stem or extended bonnet design are often applied. Here...
Dervos New Plan on Sales Abroad
- Jun 28, 2019
- Hits: 11
At present, Dervos mainly obtains customers online and through telephone. Due to the lack of actual face-to-face communication with customers, the number of customers and the rate of completion are not...
How does a cryogenic valve or low temperature valve work?
- Jun 20, 2019
- Hits: 92
A cryogenic valve means that the valve can be used in low temperature conditions; usually the valve will be considered as a cryogenic valve when the operating temperature is below -40 degrees Celsius....