Page 17 of Latest News, Dates, Events, Press, Articles
What is a foot valve?

What is a foot valve?

  • Nov 21, 2019
  • Hits: 65

Foot valve, also called bottom valve, belongs to a type of check valve. Different from other valves, a foot valve has a larger flow area than the pipe size, which is to prevent head loss of the pipe....

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Opening of DERVOS INTEGRATION CENTER

Opening of DERVOS INTEGRATION CENTER

  • Nov 13, 2019
  • Hits: 68

On Oct. 29th, a big opening ceremony of Dervos Integration Center was held in Lishui, Zhejiang. We invited our important customers to share this happy moment. The Integration Center will play an important...

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Valves fire resistance test

Valves fire resistance test

  • Nov 06, 2019
  • Hits: 61

The petrochemical industry is one of the pillar industries of the national economy. Its production process is complex, and the raw materials, semi-finished products and finished products used in the production...

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Features of Ball Valve

Features of Ball Valve

  • Nov 01, 2019
  • Hits: 77

The main features of the ball valve are their compact structure, reliable seal, simple structure, easy to repair. The sealing surface and the spherical surface are often in a closed state, not easy to...

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The differences between soft seal and hard seal of butterfly valves

The differences between soft seal and hard seal of butterfly valves

  • Oct 23, 2019
  • Hits: 232

For butterfly valves, hard seal means that both sides of the seal are made of metal material or other hard materials. The sealing performance of this seal is poor, but it is resistant to high temperature,...

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Five types of the valve sealing

Five types of the valve sealing

  • Oct 09, 2019
  • Hits: 536

The valve sealing face is composed of a valve seat and a closing member. The sealing surface on the valve seat and the closing member is tightly contacted or the sealing surface is subjected to compression...

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Treatment methods for the lack of tightness in valves

Treatment methods for the lack of tightness in valves

  • Sep 25, 2019
  • Hits: 77

Sometimes there are some troublesome problems in the use of the valve. For example, if the valve is not tight, what should we do? First, the valve sometimes suddenly shuts down, the impurities may be...

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Definitions of the valve nominal pressure, working pressure and design pressure?

Definitions of the valve nominal pressure, working pressure and design pressure?

  • Sep 19, 2019
  • Hits: 1921

1. What is the nominal pressure PN (MPa)? The reference value relating to the pressure resistance of the piping system component refers to the design given pressure in relation to the mechanical strength...

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Selection materials for valve sealing surface

Selection materials for valve sealing surface

  • Sep 11, 2019
  • Hits: 74

The valve sealing surface is generally selected according to: 1. Operating temperature of the valve. 2. Working pressure and corrosiveness of the medium. 3. The type of valve and the structure of the...

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Comparison of butterfly valve and ball valve

Comparison of butterfly valve and ball valve

  • Sep 04, 2019
  • Hits: 95

The Butterfly Valve is coupled to a handle, gear operator or actuator that rotates the shaft of the metal disc attached to the interior of the valve by 90°. When the disc rotates in the direction...

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