Single Piston Effect and Double Piston Effect Seats of Ball Valves
- Dec 11,24
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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 cav
Dervos Valves in ECO FUEL INNOVATION PROJECT
- Dec 11,24
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In 2017, we supplied 136 pcs of valves for the ECO FUEL INNOVATION PROJECT. This is a testing project of converting oil-wood chip to diesel, and Dervos is proud
Briefing for Radiographic Testing
- Dec 11,24
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Sometimes we will have orders requesting for Radiographic Testing (RT), say for API 600 Gate Valves, Butt-weld Ends, 8”, 2500 LB, as it will be applied in
5 Factors to Be Considered When Choose Right Ball Valves
- Dec 11,24
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Ball valves are having good performance in shut-off application and are widely used, but do you know how to choose a right one? Factor 1: What is the working p
Introduction and Selection of Safety Valves
- Dec 11,24
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The safety valve is a special valve in which the opening and closing member is in a normally closed state under the action of an external force. When the pressu
Pipeline Check Valve Installation
- Dec 11,24
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1. When installing, pay attention to the direction of media flow should be consistent with the direction of the arrow in the valve body. 2. Install a check val
The "Silent" Nozzle Check Valve
- Dec 11,24
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The photo shown below is axial nozzle check valve, 14 Inch, Class 300 LB, RF Flange, WCB material, typical for its "silent" & non-slam characteristic. For crit
An excellent choice for sea water application - Aluminum Bronze
- Dec 11,24
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Aluminium bronzes are most valued for their high strength and superior corrosion resistance. The most common one is Nickel Aluminium Bronze B148 C95800, which i
Comparison of butterfly valve and ball valve
- Dec 11,24
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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°.
Selection materials for valve sealing surface
- Dec 11,24
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The valve sealing surface is generally selected according to: 1. Operating temperature of the valve. 2. Working pressure and corrosiveness of the medium. 3. Th
Definitions of the valve nominal pressure, working pressure and design pressure?
- Dec 11,24
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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 pres
Treatment methods for the lack of tightness in valves
- Dec 11,24
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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 su