Relief and safety valve for instant beverage machines

摘要

A hydraulic circuit for instant beverage machines includes a tank, a water extraction pipe contained in the tank, a flow-meter connected to the extraction pipe, a pump, a first vibration-damping valve, a boiler, a second relief and safety valve, a water/steam faucet, a third beverage flow valve, and a recovery tank.

主权项

1. A valve usable in a hydraulic circuit for instant beverage machine comprising:
a water/steam inlet; a first water/steam outlet directed to a water/steam faucet; a second outlet for directing pressurized water to a beverage flow valve; and a third outlet for discharging water into a recovery tank wherein said third outlet is operated by a solenoid valve equipped with a first maximum pressure limiting device which remains closed during normal operation and opens up if a pressure exceeds a specific threshold, or if a specific command is sent to a control coil of said solenoid valve, wherein said second outlet is provided with a second maximum pressure limiting device for directing the pressurized water to the beverage flow valve, and wherein said second outlet has an inlet which is provided with a valve equipped with a third maximum pressure limiting device which enables passage of liquid in order to release pressure from the beverage flow valve, and wherein said second maximum pressure limiting device is a pre-calibrated spring, and said third maximum pressure limiting device is a further pre-calibrated spring.