{"id":315,"count":2,"description":"

A safety valve is an industrial valve designed to protect piping systems from overpressure. When the system pressure exceeds the preset threshold, the valve automatically releases excess pressure to the outside, helping protect pipelines, equipment, and operators from the risk of explosion or damage caused by overpressure. When the pressure returns to a stable level, the valve automatically closes without manual intervention.<\/p>\r\n

This is a mandatory component in high-pressure systems such as boilers, compressed air tanks, steam pipelines, and hydraulic systems.<\/p>\r\n

Basic Structure of a Safety Valve<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Component<\/strong><\/td>\r\nFunction<\/strong><\/td>\r\n<\/tr>\r\n<\/thead>\r\n
Valve Body<\/td>\r\nContains the internal components, provides the flow passage for the fluid, and withstands system pressure.<\/td>\r\n<\/tr>\r\n
Valve Seat<\/td>\r\nThe contact surface with the valve disc when closed, determining the valve's sealing performance.<\/td>\r\n<\/tr>\r\n
Valve Disc (or Valve Diaphragm)<\/td>\r\nSeals the discharge passage under normal pressure and opens when the pressure exceeds the preset threshold.<\/td>\r\n<\/tr>\r\n
Closing Force Mechanism (Spring or Pilot Control)<\/td>\r\nKeeps the valve disc closed under normal conditions and determines the valve opening pressure.<\/td>\r\n<\/tr>\r\n
Pressure Adjustment Mechanism<\/td>\r\nAllows the valve opening pressure threshold to be set or adjusted according to system requirements.<\/td>\r\n<\/tr>\r\n
Sealing Gasket<\/td>\r\nPrevents leakage at the contact points between the valve disc and valve seat.<\/td>\r\n<\/tr>\r\n
Connection<\/td>\r\nConnects the valve to the pipeline or equipment, using either threaded or flanged connections depending on the application size.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

Operating Principle of a Safety Valve<\/h2>\r\n

A safety valve operates based on the balance between the fluid pressure acting on the valve disc and the resistance force of the preset spring.<\/p>\r\n

When the system pressure is below the preset level, the spring force is greater than the force exerted by the fluid, keeping the valve disc tightly pressed against the valve seat and sealing the discharge passage. When the pressure rises above the permitted threshold, the force acting on the valve disc becomes greater than the spring force, causing the valve disc to open and allowing excess fluid to escape until the pressure returns to the preset level. The spring then pulls the valve disc back into the closed position.<\/p>\r\n

The valve opening pressure is known as the set pressure and is determined according to the design standards of each specific system. It is not a fixed value that applies to all installations.<\/p>\r\n

How Many Types of Safety Valves Are There?<\/h2>\r\n

Safety valves have two main operating mechanisms: mechanical spring-loaded valves, which are commonly used for steam, compressed air, and small boilers; and hydraulic pilot-operated valves, which use a pilot to control the valve diaphragm and are typically used for large-diameter water pipelines.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Type<\/strong><\/td>\r\nMechanism<\/strong><\/td>\r\nApplication Scale<\/strong><\/td>\r\n<\/tr>\r\n<\/thead>\r\n
Direct-Acting Spring<\/td>\r\nThe spring directly presses against the valve disc, providing a fast response and simple construction.<\/td>\r\nSmall systems: mini boilers, compressed air tanks, and small-diameter steam or gas pipelines.<\/td>\r\n<\/tr>\r\n
Indirect-Acting Spring (Mechanical Pilot)<\/td>\r\nA small pilot valve controls the main valve through a piston.<\/td>\r\nHigh-pressure and high-temperature systems requiring high accuracy.<\/td>\r\n<\/tr>\r\n
Hydraulic (Hydraulic Pilot, Diaphragm Body)<\/td>\r\nA pilot valve controls the main valve diaphragm through fluid pressure transmitted via a pilot line, providing fast opening and slow closing.<\/td>\r\nLarge-diameter water pipelines, protecting pumping stations from sudden pressure surges when pumps start or stop.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

A notable feature of the hydraulic type is its \"fast opening, slow closing\" mechanism. A mechanical spring closes almost immediately when the pressure drops, whereas a hydraulic valve closes gradually to prevent another pressure surge immediately after pressure has been released. This is an important feature for protecting high-capacity water pumping stations.<\/p>\r\n

Installation and Operation Notes for Safety Valves<\/h2>\r\n
    \r\n\t
  • The safety valve should be installed vertically, with the discharge direction following the manufacturer's or supplier's recommendations.<\/li>\r\n\t
  • The safety valve must be installed on the discharge pipeline, immediately after the discharge outlet of the main pump or booster pump and before the shut-off valve to protect the pump from overpressure. Never install it downstream of the shut-off valve, as this would disable the safety valve's protective function.<\/li>\r\n\t
  • The set pressure should be adjusted by an authorized party or qualified professional. Do not adjust the setting screw yourself after installation. The valve should be inspected periodically using the manual lift lever to ensure that the valve disc does not become stuck due to long-term buildup of deposits.<\/li>\r\n<\/ul>\r\n

    How Is a Safety Valve Different from a Pressure Reducing Valve?<\/h2>\r\n

    These are two types of valves that are often confused because they can have a similar external appearance. However, they cannot replace each other. A system equipped with a pressure reducing valve may still require an additional safety valve if there is a risk of sudden overpressure that the pressure reducing valve cannot respond to quickly enough.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    Criteria<\/strong><\/td>\r\nSafety Valve<\/strong><\/td>\r\nPressure Reducing Valve<\/strong><\/td>\r\n<\/tr>\r\n<\/thead>\r\n
    Operating Principle<\/td>\r\nEnsures that the inlet pressure does not exceed the preset threshold.<\/td>\r\nRegulates the outlet pressure to a stable, predetermined level.<\/td>\r\n<\/tr>\r\n
    Normal Operating State<\/td>\r\nFully closed.<\/td>\r\nContinuously regulates the flow.<\/td>\r\n<\/tr>\r\n
    Purpose<\/td>\r\nProtects the system against sudden overpressure.<\/td>\r\nMaintains suitable pressure for equipment downstream of the valve.<\/td>\r\n<\/tr>\r\n
    Operating Frequency<\/td>\r\nOpens only when an overpressure event occurs.<\/td>\r\nOperates regularly under normal conditions.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n

    Safety valves are directly related to the safety of both facilities and people. Therefore, selecting the wrong set pressure or operating mechanism may prevent the valve from responding in time when an overpressure event occurs. To avoid unnecessary risks, before deciding which safety valve to purchase, you should consider specific information such as the type of fluid used, the system operating pressure, and the system design pressure.<\/p>\r\n

    At An Phu Thanh, we provide advice on suitable safety valves based on our customers' actual system conditions. With an experienced team of professionals, we are always ready to provide fast and dedicated support. In addition, all our products are supplied with complete CO\/CQ and VAT documentation.<\/p>\r\n

    Explore An Phu Thanh's Safety Valve Products Below<\/h2>\r\n

    If you need consultation or a quotation for safety valves, please contact us via Hotline\/Zalo OA at 0946 729 913. The An Phu Thanh team is always ready to assist you.<\/p>","link":"https:\/\/anphuthanhvalve.com\/en\/safety-valve\/","name":"Safety Valve","slug":"safety-valve","taxonomy":"product_cat","parent":301,"meta":[],"menu_order":0,"acf":[],"_links":{"self":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product_cat\/315","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product_cat"}],"about":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/taxonomies\/product_cat"}],"up":[{"embeddable":true,"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product_cat\/301"}],"wp:post_type":[{"href":"https:\/\/anphuthanhvalve.com\/en\/wp-json\/wp\/v2\/product?product_cat=315"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}