Safety valve is a valve used to prevent damage to equipment or pipelines such as boilers and pressure vessels due to overpressure. When the fluid pressure inside the protected body reaches a specified value slightly higher than the normal working pressure (i.e. valve opening pressure), the safety valve automatically opens, discharging some of the fluid, causing the pressure to decrease. When the pressure drops to a value slightly lower than the normal working pressure (i.e. the valve reseating pressure), the safety valve automatically closes, stops discharging fluid and maintains a seal.
The function of safety valves is to prevent the medium pressure in pipelines or devices from exceeding the specified value, thus achieving the purpose of safety protection.
A vertical anti wave valve that can be closed for discharging sewage or wastewater, and can automatically close and prevent overboard water from flowing back.
Closed vertical anti wave valve, including anti wave cover, anti wave float valve, ventilation pipe, intake pipe, settling chamber, sealing rings A and B, guide groove, slide rail, tray and fixed bracket; The anti wave shield of the protective method valve is a cone-shaped structure with a counterbore at the bottom, while the anti wave float valve is a cone-shaped cavity thin shell structure with a counterbore at the upper end, a through-hole at the axis of the counterbore, a guide groove on the through-hole wall, a sealing groove on the periphery of the counterbore at the upper end of the anti wave float valve, a sealing boss on the inner side of the top of the anti wave shield and the corresponding part of the sealing groove, a through-hole on the top side of the ventilation pipe, and a sealing groove at the junction of the counterbore and through-hole of the anti wave float valve, The bottom of the fixed bracket is equipped with a sealing groove at the junction of the anti wave float valve sink hole and the through hole, and a sealing boss is located at the corresponding position, which can keep the air path unobstructed during normal operation of the aircraft; It is possible to close the air passage when the aircraft encounters surging waves or suddenly sinks, to prevent seawater from entering the interior of the aircraft; Can reopen the air passage after the surge has dissipated or the aircraft has floated.
