MULTI-FUNCTIONAL VALVE HAVING WATER HAMMER PREVENTION FUNCTION AND HAVING GATE VALVE, FAST-CLOSING CHECK VALVE, SLOW-CLOSING AUXILIARY VALVE, AND NEGATIVE-PRESSURE-ACTIVATED AIR INTAKE VALVE
[Problem] Multi-functional valves have a check valve and water stop valve function, a water hammer prevention function, and a valve body forced movement function for enabling the release of water from inside a valve and resolving poor valve body operation. However, in order to further improve the water hammer prevention function, the present invention provides a multi-functional valve in which a slow-closing auxiliary check valve for discharging reverse flow pressure and a negative-pressure-activated air intake valve are provided to approximate a non water hammer state. [Solution] A pair of magnets and/or compression springs are disposed in a valve body and/or a member for closing an escape path, and a slow-closing auxiliary check valve for discharging reverse flow pressure and a negative-pressure-activated air intake valve are provided to the bottom part of the valve body.
