Installation Direction of The Ball Valve
Ball valves are divided into fixed ball valves and floating ball valves according to their structure. According to the sealing material, there are metal hard sealed ball valves and soft sealed ball valves. According to the flow direction of the medium, there are bidirectional seals and unidirectional seals. All fixed ball valves and soft sealed ball valves are bi-directional sealed, without flow direction markings. It can be installed in any direction. Only unidirectional metal hard sealed floating ball valves have flow direction markings and direction requirements during installation.
How to identify fixed ball valves,
floating ball valves, metal sealed ball valves, etc.? The following are introduced separately.
1. Distinguish between fixed ball valves and floating ball valves based on their appearance
1.1 Fixed ball valve: the ball valve is connected to the upper and lower valve stems as a whole, or made into an integral shaft type ball, which is installed on the bearing as a whole with the upper and lower valve stems. The ball can rotate freely along the axis perpendicular to the valve channel.
1.2 Floating ball valve: Its main feature is that the ball has no supporting shaft, and the ball is supported by the valve seats at both ends of the valve inlet and outlet. The valve stem is connected to the ball in a movable manner. The ball of this ball valve is clamped between two valve seats and it is in a floating state.
2. Distinguish between hard sealed floating ball valves and hard sealed fixed ball valves based on the nominal diameter and nominal pressure markings on the valve.
3. Distinguishing soft seal ball valves and hard seal ball valves from product qualification certificates.
3.1 According to the model specifications on the valve certificate, Q41Y, Q341Y, Q347Y, and other models with the letter Y are hard sealed ball valves, while others such as Q41PPL, Q341PPL, or Q41F are soft sealed ball valves. The number "1" after 4 represents the floating ball valve, and "7" represents the fixed ball valve.
4. Distinguish between hard sealed ball valves and soft sealed ball valves according to the "temperature" on the nameplate.
The operating temperature for hard sealed ball valves is above -29-300 ℃, while for soft sealed valves, the temperature is between -29 to 121 ℃. Temperature -29 to 425 ℃ is for a hard sealed ball valve. Temperature -29 to 121 ℃ is for a soft sealed ball valve.
5. Introduction to internal sealing and installation of hard sealed floating ball valves
All hard sealed floating ball valves are sealed at the auxiliary valve body end, which is the smaller end of the two-piece valve structure. As long as the auxiliary valve body is installed downstream of the medium flow direction, it is sufficient.
6. Distinguish all valve specifications and names based on the factory code on the valve.
Each valve body is stamped with a permanent factory number (product serial number), and the factory number is also engraved in the lower right corner of the nameplate. The certificate of conformity also has a number. According to the corresponding number in the Supply List, the specifications, models, names, etc. of the valve can be found.
The valve numbering method is "production notice number+project number+serial number", such as R1509422 01 001. The first 8 digits are R1509422 as the production order number, 01 as the project number, and 001 as the first unit. As long as the first 10 digits are found, they can be compared to the "Supply Details Table" in the appendix.You can also search according to the customer's own material code.
