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<p><a href="https://www.sinpovalve.com/water-control-valve" rel="noopener noreferrer" target="_blank"><strong>Relief valves</strong></a> are found in many pressurized systems that involve the control of fluid flow, such as ones that are controlled electronically, hydraulically, or pneumatically. While typical systems such as these require some source of power to operate them, relief valves must by their nature be capable of operating under all conditions, especially in the case of failure of primary power when the system controls may not be operable. For this reason, relief valves are primarily not separately powered devices and use the passive power of the process fluid pressure to actuate the valve.</p><p><br></p><p><strong>Components and Operation of Conventional Relief Valves</strong></p><p>The valve inlet nozzle which is connected to the system or pressure vessel for which protection is being provided.</p><p>A moveable disc or diaphragm that controls the flow of fluid through the valve and to the outlet port.</p><p> A spring that seats the disc in place to keep the valve closed and that allows the valve to open when the system pressure exceeds a pre-determined value.</p><p>The relief valve will remain normally closed, preventing the system from expelling fluid by the action of the spring pressure holding the disc seated in the nozzle. Should the system pressure rise such that the inlet pressure at the valve exceeds the set pressure, then the inlet pressure will compress the spring, allowing the disc to lift off the nozzle and allowing fluid to exit through the outlet until the overpressure condition has been corrected and it returns to a value below the set pressure.</p><p><br></p><p><strong>Applications of Relief Valves</strong></p><p>Relief valves have numerous applications to provide for the safe operation of systems and equipment that includes industries such:</p><p><br></p><p>Aircraft & aerospace</p><p>oil & gas</p><p>petrochemical</p><p>power generation</p><p>chemical manufacturing & processing</p><p>hydraulic circuits</p><p>pneumatic systems</p><p>refrigeration</p><p>cryogenics</p><p>semiconductors</p><p>Facilities that employ many relief valves in their process and operations typically install automation systems using wireless acoustic transmitters or similar technologies to simplify the monitoring of valve status and reduce the effort needed to satisfy reporting requirements.</p><p><br></p><p>In residential applications, heating systems using boilers for hydronic heat and domestic hot water tanks will use <a href="https://www.sinpovalve.com/cast-steel-wcb-steam-pressure-relief-valve" rel="noopener noreferrer" target="_blank"><strong>pressure relief valves</strong></a> to provide safety and prevent explosions. As heated water expands in volume, the use of these valves in conjunction with other safety devices such as expansion tanks and gas shutoff valves help assure the safe operation of these pressure vessels. Many of the models used in residential applications feature test levers so that their operation can be verified during routine equipment maintenance.</p>
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