Vacuum breaker valve

A vacuum breaker valve comprising a valve body, a non-return member, a waterstop, and an abutting member;

• wherein the valve body has a water inlet end and a water outlet end, and the valve body is connected to a pipe so as the water flows from the water inlet end to the water outlet end;
• the valve body has a shoulder portion and a stepped portion on the inner wall thereof, and the top surface of the shoulder portion comprises at least a first through hole downwardly penetrating the outer wall of the valve body;
• the shoulder portion is located below the stepped portion, and the stepped portion is formed in two steps shape, which has a vertical first abutting edge, a horizontal second abutting edge, and a vertical third abutting edge in sequence;
• wherein the non-return member comprises a spring and a blocking member which are positioned in the valve body, and the spring is abutted between the valve body and the blocking member;
• wherein the waterstop is formed in a round cap shape having an opening faced up, and the waterstop has a peripheral edge and a bottom edge which are connected together;
• a locating groove is formed on the inner wall of the peripheral edge, and an elastic protrude is configured to downwardly protrude from a center portion of the bottom edge, and at least a second through hole penetrates through the elastic protrude;
• when the waterstop is positioned into the valve body, the first abutting edge, the second abutting edge, and the third abutting edge respectively abut against and provide support for the peripheral edge, the bottom edge, and elastic protrude;
• the spring is adapted to push the blocking member to bear against the elastic protrude, so that the blocking member blocks the second through hole under normal condition when water is not used;
• and
• wherein the abutting member is a hard round plate, and at least a third through hole thereon, and the abutting member is coupled in the locating groove of the waterstop;
• with the outward push of the abutting member, the waterstop is configured to effectively fit with the first abutting edge, the second abutting edge, and the third abutting edge, and the waterstop is clamped by the abutting member, such that the first abutting edge, the second abutting edge, and the third abutting edge are adapted to respectively provide supports for the peripheral edge, the bottom edge, and the elastic protrude, so as to increase the contact area between the waterstop and the valve body, thereby achieving the leakage-proof of the waterstop.