A valve assembly includes a valve member and a valve body. The valve body has a contact surface intended to come into contact with an adjacent contact member The valve body also has a channel having an end portion opening to the outside of the valve body at at least one end opening, a valve member seat encircling a passage cross-section of the end portion of the channel, and an intermediate surface extending between the contact surface and the end opening. The valve member is capable of engaging with the valve member seat by contact in order to prevent a flow in the channel. The valve body has a groove provided on the intermediate surface, the groove encircling the valve member seat.
1. A valve comprising:
a valve member; and
a valve body, said valve body having a contact surface designed to enter into contact with an adjacent contact member, a channel having an end portion opening to an exterior of the valve body at at least one end opening, a valve member seat encircling a passage cross section of said end portion of the channel, and an intermediate surface extending between said contact surface and said end opening;
wherein said valve member is configured to cooperate with said valve member seat so as to prevent a flow through said end opening;
wherein said valve body has a groove provided at said intermediate surface, said groove encircling said valve member seat;
wherein said valve member is configured to cooperate with said valve member seat by contact at a contact zone of said valve member seat;
wherein said groove extends depth-wise parallel to a longitudinal direction of said end portion of the channel at least as far as a depth of said contact zone;
wherein said groove has at least one first portion extending as far as a first groove depth and one second portion extending as far as a second groove depth; and
wherein said groove has a circular cylindrical central wall with a directrix parallel to said longitudinal orientation, a back wall extending radially from said circular cylindrical central wall, and a frustoconical exterior wall forming a non-zero angle relative to said longitudinal orientation, which extends from the back wall to said intermediate surface.
2. The valve as claimed in claim 1 , wherein said valve member comprises a head configured to cooperate with said valve member seat and also comprises a rod that extends in said channel, said rod having, from said head, a portion of reduced cross section that defines an interior chamber in said channel, and wherein said valve body further comprises a conduit that opens in said interior chamber.
3. The valve as claimed in claim 2 , wherein said end portion of the channel has a longitudinal orientation that intersects said intermediate surface at said end opening.
4. The valve as claimed in claim 3 , wherein said groove, seen parallel to said longitudinal orientation, is circular.
5. The valve as claimed in claim 4 , wherein said end portion of the channel has a circular transverse section, said groove being concentric with said end portion of the channel.
6. The valve as claimed in claim 1 , wherein said groove extends depth-wise parallel to the longitudinal direction of said end portion of the channel at least as far as double the depth of said contact zone.
7. The valve as claimed in claim 1 , wherein said end portion of the channel has a longitudinal orientation that intersects said intermediate surface at said end opening.
8. The valve as claimed in claim 7 , wherein said groove, seen parallel to said longitudinal orientation, is circular.
9. The valve as claimed in claim 8 , wherein said end portion of the channel has a circular transverse section, said groove being concentric with said end portion of the channel.