Single Piston Effect and Double Piston Effect Seats of Ball Valves
- Dec 18, 2019
- Hits: 4340
SPE (Single Piston Effect) seats are usually called self-relieving seats. Trunnion mounted ball valves with SPE seats are able to release over-pressure in cavity into pipeline automatically. ...
Brief introduction of V-TYPE BALL VALVE
- Dec 12, 2019
- Hits: 68
V-type ball valve is a kind of ball valve. Its closing part is a V-shaped opening on the ball. The V-shaped opening has a sharp edge. During the rotation of the ball, there is a wiping effect between...
The relation between Valve Size and Medium Flow Velocity
- Nov 27, 2019
- Hits: 57
1. The flow rate and flow velocity of the valve mainly depend on the diameter of the valve and the resistance of the structure of the valve to the medium. At the same time, they are intrinsically related...
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....
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...
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...
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...
The differences between soft seal and hard seal of butterfly valves
- Oct 23, 2019
- Hits: 235
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,...
Five types of the valve sealing
- Oct 09, 2019
- Hits: 555
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...
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...