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Choosing the right safety valve isn't just about understanding these classifications—it also involves knowing the type of medium being handled, whether it's corrosive, the temperature and pressure (both operating and set pressure), and the type of connection (threaded or flanged). Shanghai Wuyue Safety Valve Factory, a leading manufacturer in the industry, provides expert guidance on selecting the appropriate safety valve for different applications.
General Guidelines for Safety Valve Selection
1) The nominal diameter of the safety valve must be calculated to ensure that its discharge capacity meets or exceeds the safe discharge requirement of the pressure vessel.
2) Determine the pressure rating of the safety valve based on the design pressure and temperature of the system it will be installed in.
3) Steam boilers or steam piping typically use full-opening safety valves with a wrench. For high-pressure steam systems (over 3 MPa) or gas systems with temperatures above 320°C, a heat sink should be considered.
4) Hot water boilers usually require micro-opening safety valves without a wrench.
5) For non-hazardous media like hot water or steam above 60°C, a safety valve with a wrench is generally recommended.
6) Incompressible liquids such as water typically use closed micro-opening safety valves or safety relief valves.
7) High-pressure feedwater systems often use closed full-opening safety valves, such as those found in high-pressure feedwater heaters and heat exchangers.
8) Compressible gases, such as in gas storage tanks or pipelines, generally use closed full-opening safety valves.
9) Large-diameter, high-pressure, and high-discharge systems often use pulse-type safety valves, commonly found in pressure-reducing stations and power plant boilers.
10) For flammable, highly toxic, or hazardous media, closed safety valves must be used. If a lifting mechanism is needed, a closed-type safety valve with a wrench is recommended.
11) If the system experiences fluctuating pressure or has a backpressure over 10%, a bellows-type safety valve should be selected.
12) Vacuum relief valves are typically used in systems that may experience negative pressure during operation.
13) Systems with low freezing point media often use insulated jacketed safety valves to prevent blockage.
14) Liquefied gas transport vessels, such as train tankers or storage tanks, should be equipped with built-in safety valves.
15) Tank tops often use hydraulic safety valves in conjunction with breathing valves.
16) Pilot-operated safety valves are commonly used in downhole drainage or natural gas pipeline systems.
17) A safety return valve is typically installed on the liquid phase return line of a liquefied petroleum gas station pump outlet.
18) Choose the appropriate material for the safety valve based on the medium. For example, copper or copper-containing valves should not be used with ammonia, and acetylene should avoid valves with more than 70% copper content.
19) For high-discharge applications, a full-opening valve is preferred. For stable pressure systems with minimal leakage, non-direct-acting valves like pulse-type ones are suitable. Containers longer than 6 meters should have at least two safety valves.
20) Class E steam boilers or low-pressure stationary vessels can use static weight or lever-type safety valves, while mobile equipment requires spring-loaded types.
21) For thick or easily clogged media, consider using a combination of a safety valve and a rupture disc for venting.
22) Select the spring working pressure level according to the nominal pressure of the safety valve. Understanding the relationship between the valve’s nominal pressure and the spring’s working pressure is essential for proper selection.
A vertical valve safety valve: http://?20_1.html
Introduction to the basic principles of safety valve selection
The selection of a safety valve is largely influenced by the working environment in which it will be used. There are various types of safety Valves available, and they can be categorized based on their structure, such as spring-loaded, lever-operated, or pilot-operated (also known as pulse-type) valves. When large capacity is required, a pilot-operated safety valve is typically used. Additionally, safety valves can be classified into full-opening and micro-opening types based on the amount of discharge. Depending on the loading mechanism, they are also divided into weight-lever, spring-loaded, and pulse types. From a medium discharge perspective, they are categorized into fully enclosed, semi-enclosed, and open types. Based on the valve opening size, they are further classified into micro-opening and full-opening spring-loaded safety valves.