Fireproof and anti-static ball valve

Fireproof and anti-static ball valveRod flying out of ball valve

Product Introduction:

Fireproof, anti-static, and anti valve stem flying out of the Chemical Industry Department standard flange ball valve Q41F Chemical Industry Department standard 'three prevention' ball valve HG20592-2009 Chemical Industry Department standard ball valve/Chemical Industry Department standard carbon steel flange ball valve/Chemical Industry Department standard cast steel flange ball valve/Chemical Industry Department standard stainless steel flange ball valve/Fireproof, anti-static, and anti flying out valve stem natural balloon valve RQ41F Fireproof, anti-static gas ball valve/Chemical Industry Department flange ball valve is a 90 degree rotary switch valve, which is an ideal valve for pipeline switch cut-off. Its sealing performance reaches no leakage and is mainly used for liquids, water, gases, steam, petroleum, and petrochemical products. The ball valve products of the Ministry of Chemical Industry are divided into manual and high platform types, which have the characteristics of compact structure, exquisite appearance, convenient use, reliable performance, and excellent quality. They can be matched with actuators for pneumatic control and electric intelligent control.

Product Features:

The ball valve itself has a compact structure, is easy to operate and maintain, and is suitable for general working media such as water, solvents, and natural gas. It can be closed tightly with only a 90 degree rotation and a small rotational torque. *The equal inner cavity of the valve body provides a low resistance and straight passage for the medium. It is generally believed that ball valves are suitable for direct opening and closing, but recent developments have designed ball valves to have throttling and flow control functions. The main characteristics of a floating ball valve are its compact structure, easy operation, and maintenance. The valve body of a ball valve can be integral or modular.

Main advantages:

1. Low fluid resistance, full bore ball valves have almost no flow resistance.

2. Simple structure, small size, and light weight.

3. Tight and reliable. It has two sealing surfaces, and currently various plastics are widely used as sealing surface materials for ball valves, which have good sealing performance and can achieve * sealing. It has also been widely used in vacuum systems.

4. Easy to operate, quick opening and closing, only need to rotate 90 ° from fully open to fully closed, making it convenient for remote control.

5. Easy to maintain, ball valve structure is simple, and the sealing ring is generally movable, making disassembly and replacement relatively convenient.

6. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and when the medium passes through, it will not cause erosion of the valve sealing surface.

7. Widely applicable, with diameters ranging from a few millimeters to several meters, suitable for applications from high vacuum to high pressure.

8. Due to the wiping property of ball valves during opening and closing, they can be used in media with suspended solid particles.

Standard:

Design and Manufacturing Standard: GB/T 12237-2007

Flange standard of the Ministry of Chemical Industry: HG/T 20592-2009

Structural length: GB12221-2005

Pressure test: GB/T13927-2008

Fireproof structure:

Our company's floating ball valve seat adopts a * structure. When a fire occurs and the non-metallic sealing surface material burns out, the metal ring uses the elastic force of the spring to push the seat to fit and seal with the ball, thereby preventing the spread of fire and the outflow of medium. (Fireproof structure design complies with API607, JB/T6899, and BS755)

Anti static device:

When operating the valve, static charges are generated and accumulate in the ball due to friction between the ball and non-metallic material valve seats such as polytetrafluoroethylene. To prevent the generation of static sparks, an anti-static device is installed on the valve to dissipate the generated static electricity.

Valve stem anti flying structure:

When the medium passes through the valve, the pressure in the chamber of the valve body may push the valve stem out. To prevent this situation from happening, a protruding platform structure is installed at the lower part of the valve stem. In this way, even if the packing or thrust bearing is burned or damaged due to other reasons during a fire, the pressure of the medium inside the valve body will cause the valve stem protrusion to seal tightly with the valve body, preventing a large amount of medium from leaking from the damaged packing area.

Outline dimension table:

Difference from ordinary ball valves:

Mainly used for gas pipelines with flammable and explosive media. For example, coal gas, natural gas, liquefied petroleum gas, and their mixtures. Ordinary ball valves are used for non flammable and non explosive pipelines, such as water, air, etc. The main difference between the two lies in their internal structure, which cannot be distinguished by their appearance.

Fire prevention is divided into three parts: fire prevention at the ball core and valve seat (B), fire prevention at the flange in the valve body (C), and fire prevention at the valve stem (A).

Structure diagram:

Fireproof at the core and valve seat. A soft sealed ball valve is a structure that can maintain a certain sealing performance even when the valve seat is burned out by high temperature in the event of a fire. That is to minimize the occurrence of internal leakage as much as possible. Although hard sealed ball valves can prevent the seat of soft sealed ball valves from burning out during a fire, it is difficult for hard sealed ball valves to achieve the sealing performance of soft sealed ball valves during normal operation, and there may be slight internal leakage, especially in gas pipelines. Soft sealed ball valves are more widely used.

The soft seal valve seat of the fireproof ball valve is embedded in the groove of the valve body. During normal operation, the soft seal valve seat maintains sealing. When the soft seal valve seat burns out, the ball core is pushed by the medium pressure to the metal sealing surface near the inner ring, maintaining a hard sealing state and reducing internal leakage. The valve seat of a regular ball valve is directly installed between the valve body and the ball core. After the soft seal valve seat burns out, it cannot effectively form a metal hard seal.

Fireproof at the flange of the ball valve. The ball valve body is a two-piece or three piece split structure, which is assembled by bolts. There are O-ring seals and graphite metal wrapped gaskets between each section of the valve body to maintain sealing. After the O-ring is burned during a fire, the graphite metal wrapped gasket still keeps the valve body from leaking or leaks a small amount. There is also a metal contact seal between the valve bodies. For one-piece structure ball valves, the valve body is integral and the valve body is basically not leaking out.

Fireproof at the valve stem. The sealing packing of the valve stem, polytetrafluoroethylene, is melted at high temperature. The pressure inside the valve body will push the valve stem out of the valve body, and the shoulder on the valve stem will be blocked by the valve body. And use the pressure inside the valve body to press the valve stem tightly, forming a seal. This bottom mounted valve stem can also prevent the valve stem from being pushed out of the valve body by the medium pressure when the pressure in the ball valve chamber is abnormally increased, ensuring safety. High temperature resistant flexible graphite fillers and special fillers such as graphite metal wire combination compression can be used as fillers.

Anti static structure. According to the national standard GB/T12237, for ball valves with a diameter ≤ DN50, the valve stem and body can conduct electricity. For ball valves larger than DN50, it is necessary to ensure that the ball core, valve stem, and valve body can conduct electricity. When the power supply voltage does not exceed 12V, the anti-static resistance between the ball core, valve stem, and valve body is less than 10 Ω.

The conductive structure is drilled with small holes at two locations on the valve stem, one in contact with the valve body and the other in contact with the ball core. Install springs and small metal balls inside the small hole. The small metal ball is lifted by a spring to ensure contact with the valve body, valve stem, and ball core, forming a conductive circuit.

The stem of a regular ball valve does not have a conductive structure.

Ordinary ball valves cannot be replacedFireproof and anti-static ball valveThere is no anti-static function and no fireproof structure. There is a fire hazard.