Analysis of The Main Design Standards for Gate Valves

BS 5150: It covers the specifications for cast iron gate valves for general purposes, including aspects such as dimensions, materials, and performance requirements. For example, it specifies in detail the chemical composition and mechanical properties of the cast iron valve body to ensure the strength and durability of the gate valve under normal operating conditions.

BS 5153: This is mainly a standard for copper alloy gate valves. It regulates the composition range of copper alloy materials, the structural design of the valve (such as the way the gate and the seat fit together), and the sealing performance. It is applicable to occasions where copper alloy valves are required, such as in plumbing systems.

BS 5163: This standard is aimed at steel gate valves for general purposes. It stipulates key parameters such as the pressure-temperature ratings, the wall thickness of the valve body, and the size of the valve stem to ensure the safe and reliable operation of steel gate valves in industrial and civil pipeline systems.

API 600: It is a standard for steel gate valves used in the petroleum and natural gas industries. It specifies the design details of the valve, such as the connection method between the valve body and the valve cover, the structure of the gate (wedge type or parallel type), the size and material of the valve stem, etc. Meanwhile, it also covers the performance requirements and testing methods of the valve under different pressure-temperature conditions to ensure that the valve can work properly in the harsh petrochemical environment.

API 6D: It is mainly a standard for pipeline valves, and the gate valve is one of them. It involves the whole process specifications for the design, manufacturing, inspection, and testing of valves. For example, for gate valves used in long-distance pipelines, the API 6D standard stipulates that the end connection forms of the valve (such as flange connection, welded connection, etc.) should meet the installation and operation requirements of the pipeline, and the valve should be able to withstand the high pressure inside the pipeline and the erosion of the medium.

ASME B16.34: This standard is widely applied and includes requirements for pressure-temperature ratings, dimensions, materials, etc. of various valves including gate valves. It provides basic parameter bases for the design of valves under different working conditions (such as high temperature, high pressure, corrosive media, etc.). For example, according to ASME B16.34, for gate valves of different nominal pressure ratings, the thickness of the valve body, the size of the flange, etc. are clearly defined to ensure that the valve can safely bear the corresponding pressure.

ASME B18.2.1: It involves the standard for bolts, nuts and other connecting parts of valves. For gate valves, the correct specification of connecting parts is crucial to ensure the sealing performance and the stability of the overall structure of the valve. This standard stipulates the size, material, mechanical properties and other contents of the connecting parts to make the assembly of the gate valve meet the requirements of safety and reliability.

ISO 15761: It mainly focuses on the design and manufacturing requirements of industrial valves, including gate valves. It emphasizes the functionality and safety of the valve and stipulates contents such as the calculation method of the flow coefficient of the gate valve and the testing procedure of the sealing performance, which helps to achieve the consistency of valve design and quality control on a global scale.

ISO 7005-1: This standard is about metal flanges. Although it is not specifically for gate valves, the flange connection part of the gate valve needs to follow this standard. It stipulates the types of flanges (such as flat welding flanges, butt welding flanges, etc.), dimensions, tolerances and the form of the sealing surface, etc., to ensure the sealing reliability of the connection between the gate valve and the pipeline through the flange.

MSS SP-70: It is a standard for steel gate valves with flanges and butt welding ends. It stipulates the manufacturing quality, material selection, dimension tolerances and other aspects of components such as the valve body, valve cover and gate of the valve. For example, in terms of the appearance quality of the valve, MSS SP-70 requires that the surface of the valve body should be smooth and free from obvious casting defects to ensure the performance and service life of the valve.

MSS SP-71: It mainly involves the standards for gray cast iron gate valves, including aspects such as design, materials, and performance testing. For example, it stipulates the minimum wall thickness of the gray cast iron gate valve to ensure that the valve will not be damaged, such as cracking, under normal working pressure.