Device for securing fire hydrants by locking the check mechanism of a valve spigot

Abstract

The invention relates to a device for securing a fire hydrant, includes a duct ( 3 ), a control pipe ( 4 ) provided at the lower end with a gate valve including a gate ( 7 ) for allowing or preventing the water supply of the duct ( 3 ) from the main network, the gate having an essentially planar or frusto-conical upper face ( 3 ), characterised in that a locking element ( 10 ) is provided at the level of the upper surface ( 8 ) and can extend radially relative to the control pipe in order to prevent, in the locking position, the axial displacement of the gate ( 7 ).

1 . Device for securing a fire hydrant that comprises a pipe ( 3 ), a control tube ( 4 ) that is equipped at its lower end with a valve spigot that consists of a check mechanism ( 7 ) that can allow said pipe ( 3 ) to be supplied with water from the primary network or prevent it from being supplied from said network, whereby said check mechanism comprises an essentially flat or tapered upper surface ( 8 ), characterized in that a locking means ( 10 ) is positioned at said upper surface ( 8 ) and can be deployed radially relative to said control tube in such a way that, in the locked position, it prevents said check mechanism ( 7 ) from moving axially. 
   
   
       2 . Securing device according to  claim 1 , wherein the locking means ( 10 ) is a bolt that is controlled by a lock whose body ( 9 ) forms a sealed chamber ( 11 ) with the pipe ( 3 ). 
   
   
       3 . Securing device according to  claim 2 , wherein the lock is distant from the bolt and wherein the bolt is activated in rotation by means of an essentially vertical rod, whereby said rod is controlled by said lock. 
   
   
       4 . Securing device according to  claim 2 , wherein said lock opens only in the presence of a magnetic or electromagnetic signal that is provided by an outside source. 
   
   
       5 . Securing device according to  claim 1 , wherein the locking means ( 10 ) is equipped with ferromagnetic elements and wherein the pipe ( 3 ) supports a system for activation by magnetization that can radially deploy said locking means. 
   
   
       6 . Securing device according to  claim 4 , wherein the locking means ( 10 ) is a bolt that is controlled by a lock and wherein the mechanism for activation by magnetization and the mechanism for activation by the lock both supersede one another for the closing. 
   
   
       7 . Securing device according to  claim 3 , wherein said lock opens only in the presence of a magnetic or electromagnetic signal that is provided by an outside source. 
   
   
       8 . Securing device according to  claim 7 , wherein the locking means ( 10 ) is a bolt that is controlled by a lock and wherein the mechanism for activation by magnetization and the mechanism for activation by the lock both supersede one another for the closing.