1. Scope of application of Q41F4 flanged fluorine-lined ball valve This standard applies to flanged or butt welded ball valves. These valves generally have (but are not limited to) circular passages, and the passages have full diameter, regular diameter or reduced diameter. The following provisions shall be incorporated into the standard, unless otherwise agreed by the manufacturer and the purchaser. Valves conforming to this standard are generally suitable for liquids and gases. The pressure and temperature that the valve is suitable for generally meet the standards listed in Section 2, but may also be limited by the valve seat and sealing material or other special factors.
1.3 The valve specifications to which Brass Check Valve  this standard applies are NPS 1/2 to NPS 36. 1.4

This standard applies to ball valves of the following materials: carbon steel, alloy steel, stainless steel, ductile iron and bronze. 1.5 The designations of common valve body types are given in Figure 1. When the valve body type is changed or other types of valve body are adopted, the name of the type can be determined by the manufacturer. The names of the main parts of the fluorine-lined ball valve are given in Figure 2, and the names of other parts can be determined by the manufacturer. Body type and valve components may also be identified in accordance with applicable MSS standards or other technical standards. 2. Working pressure rating

2.1 The pressure and temperature ratings of flanged and butt welded ball valves shall comply with the following standards, unless the fluorine-lined ball valve is limited by its seat and sealing material. ANSI/ASME B16.5--1988 and ANSI/ASME B16.34--1988. 2.1.1 Carbon Steel Alloy Steel ANSI/ASME B16.5- 1988 and ANSI/ASME B16.34-1988. 2.1.22.1.3 Stainless Actinium ANSI/ASME B16.5-1988 and ANSI/ASME B16.34--1988. ANSI/ASME B16.42--1987. 2.1.4 Ductile Iron ASME B16.24--1991. 2.1.5 Bronze 2.2 Constant Working Pressure (CWP) Normal temperature working pressure ratings for valve housings and components. For carbon steel , alloy steel, stainless steel and ductile iron are rated at 100F (38C). For bronze, the rated pressure is 150F (66C). The maximum working pressure at any other temperature should not exceed this rated pressure. 3. Fluorine-lined ball valve channel size 3.1 The channel of the ball valve can be full diameter, regular diameter or reduced diameter. The minimum hole diameter of full-bore valves should be in accordance with ANSI/ASME B16.34 for ball valves with a size less than or equal to NPS 30; for ball valves with a size greater than NPS 30, it should be agreed between the manufacturer and the buyer. 3.1.2 The hole diameter of regular diameter and reduced diameter ball valve is smaller than that of full diameter ball valve, and its diameter should be listed in Table

1. 1. Material Valve housing refers to the parts that bear the pressure in the pipeline but does not include balls, valve seats, seals and other parts. This standard covers only pressure-bearing bolted connections, excluding mechanical connections and bolted connections for end flanges. Recommended valve body and bolting materials meet the specifications listed in Sections 2.1.1 through 2.1.5. When using alternative materials, the marine valve manufacturer should be able to prove that these alternative materials can at least meet the intended use requirements according to the documents provided by the material manufacturer or the approved supplier.