Abstract: A safety valve includes a body, a chamber defined by the body, two conduits leading into the chamber, a first conduit being upstream with respect to the chamber and the other conduit, a sleeve, a spring housed by the sleeve, and a clapper drawn by the spring. The clapper, when drawn, forms a passage between the chamber and one of the conduits.

Abstract: A sewer drain trap primer valve includes a case defining a volume; a flexible diaphragm separating the volume into an upper, water chamber and a lower, sealed, air chamber; a conduit connecting the water chamber with an outlet orifice defined by a lower end of the case; a valve element moveable between a first position and a second position in response to differential of pressure between an inlet, defined by an upper end of the case, and the water chamber; and a check valve that permits flow of water in a direction from the inlet toward the water chamber and restricts flow of water in the opposite direction. The inlet orifice is located between the volume and a source of domestic water. The outlet orifice is located between the volume and a sewer drain trap. The conduit defines a valve seat and, in first position, the valve element engages the seat to restrict flow of water from the water chamber into the conduit.

Abstract: A tap assembly includes a body with a chamber having an inlet and an outlet, and a seat therebetween. A clapper is disposed for movement relative to the seat between a first position engaged upon the seat for resisting flow of fluid toward the outlet, and a second position of for permitting flow. The tap assembly also includes a reciprocal positioning assembly with a rod mounted for axial movement between a first position for allowing the clapper to engage upon the seat and a second position for precluding the clapper from engaging upon the seat; a cylindrical housing; and an elastically deformable elongated element which forms a split ring positioning unit for the rod. The positioning unit has an inner ring and an outer ring.

Abstract: A toggle linkage check valve includes a housing having an inlet and an outlet, and a valve assembly disposed within the housing. The valve assembly includes (i) a sealing plug adapted for movement between a first, closed position for preventing flow of liquid between the inlet and the outlet, and a second, open position for substantially permitting flow of liquid between the inlet and the outlet, and (ii) a spring assembly removably disposed within the valve assembly. The spring assembly contacts the sealing plug and biases the sealing plug towards the first, closed position. The spring assembly comprises a rod member and means for biasing the rod member toward the sealing plug. In the second, open position of the sealing plug, the rod member lies at an acute angle to a plane of the sealing plug.