초록 ▼

The present invention relates to a double poppet valve comprising two independently movable valve heads cooperating with a valve seat located in a valve housing between an inlet duct and an outlet duct for a liquid product, and enclosing therebetween in the open position as well as in the closed pos

The present invention relates to a double poppet valve comprising two independently movable valve heads cooperating with a valve seat located in a valve housing between an inlet duct and an outlet duct for a liquid product, and enclosing therebetween in the open position as well as in the closed position a leak control space adapted to be sealed in the open position of the valve to reduction of the distance between the two valve heads caused on opening of the valve by one of the valve heads being advanced so as to engage the other valve head at the end of a predetermined stroke, whereafter the two valve heads are forced into mutual sealing engagement by a spring force, the advancing valve head being affixed to a hollow actuating rod adapted to have supplied therethrough a cleaning liquid for said leak control space, a drain pipe communicating with said leak control space being provided for draining said cleaning liquid to the exterior. The invention provides that the follower valve head is connected to an actuating tube in which the actuating rod of the advancing valve head is slidably guided, that furthermore the seat for the two valve heads is formed as a cylindrical valve seat, and that the hollow actuating rod of the advancing valve head is provided in the vicinity of the leak control space with injection bores for said cleaning liquid opening into said space in radial directions.

대표청구항 ▼

A double-seat valve comprising an advancing valve head movable axially between a closed position and an open position, a coaxial follower valve head having a closed position intermediate said open and closed positions of the advancing valve head and having an open position in which it is engaged wit

A double-seat valve comprising an advancing valve head movable axially between a closed position and an open position, a coaxial follower valve head having a closed position intermediate said open and closed positions of the advancing valve head and having an open position in which it is engaged with the advancing valve head, and a valve housing providing for communication between a pair of ducts when said valve heads are in their open positions and defining a seat for each said valve head which the valve head sealingly engages when it its closed position, said valve housing being cooperable with the valve heads in their closed positions to define a leakage chamber between them which is substantially sealed from each of said ducts by one of said valve heads and which is drained to a leakage outlet remote from said ducts, said double-seat valve being characterized by: A. said follower valve head having a diameter at least as large as that of said advancing valve head; B. each of said valve heads having radially outwardly facing sealing means around its periphery; C. said valve housing having therein a passage for communicating said ducts which has a pair of cylindrical surface portions, one for each of said valve heads, each said cylindrical surface portion (1) having a diameter for slidable sealing engagement by its valve head and (2) extending a substantial distance axially along said passage, with one end adjacent to the other cylindrical surface portion and an oppposite end remote therefrom, said seat for each valve head comprising a zone of its cylindrical surface portion that is intermediate said ends thereof; D. an actuating rod to which one of said valve heads has a coaxial connection, said actuating rod having a feed bore therein, (1) one end of which is communicated with a cleaning fluid inlet that is axially spaced from both of said valve heads and (2) the other end of which is communicated with a plurality of nozzle bores that are between the valve heads and open radially outwardly for discharge towards said cylindrical surface portions; and E. actuating means for moving each of said valve heads independently of the other axially within its said cylindrical surface portion between its seat and a defined position in which the valve head is spaced from its seat and is at the axial side thereof that is remote from the other valve head but maintains sealing engagement with its cylindrical surface, to provide for cleaning the valve seats without contamination of said ducts.