A check valve having a valve that is movable by incoming water in the flow direction, from a closed position, where it bears against a first valve seat, against a restoring force into an open position, where it is raised from the first valve seat, and having a pressure relief valve with a closing member that is movable by pressure of the water flowing back against the flow direction, from a closed position, in which it bears against a second valve seat, against a restoring force into an open position where it is raised from the second valve seat. The restoring force acting on the closing member is greater than the restoring force acting on the valve body. The closing member has a closing member core made of a first material, and at least in the partial region thereof that abuts the second valve seat in the closed position, has a film or a layer made of a second relatively softer and/or elastic material.

A valve assembly that includes a valve housing and a valve body that is configured to be mated with the valve housing. The valve housing includes at least one window that extends through a wall of the valve housing, and the valve body includes at least one prong that is configured to mate with the window when the valve body is mated with the valve housing.

A valve device includes an entry aperture and an exit aperture for a fluid, a chamber which puts the entry and exit apertures in selective communication, a housing compartment, a piston disposed in the compartment, which is mobile between a closing position in which it prevents the transit of the fluid and an opening position in which it allows the passage of the fluid, and elastic return means associated with the piston A machine for preparing beverages includes at least one said valve device.

Ring disc nozzle check valve 100 allows fluid flow in one direction and can act as a relief valve and comprises valve body 1 which defines valve body fluid passageways 20,22 therethrough; primary seat 2 disposed in valve body fluid passageways 20,22 proximate fluid inlet 30; primary disc 4 disposed in valve body fluid passageways 20,22 proximate fluid inlet 30 and in communication with primary seat 2; secondary disc 5 nested within valve body fluid passageways 20,22, where secondary disc 5 defines secondary seat 3 at a peripheral edge of primary disc 4; diffuser 8 disposed in the valve body fluid passageway 20 proximate fluid outlets 32a,32b; primary spring 10 disposed in valve body fluid passageways 20,22 and in communication with diffuser 8 and primary disc 4, where primary spring 10 is adapted to urge primary disc 4 to a closed position; primary shaft 6 disposed within valve body fluid passageway 22 intermediate diffuser 8 and secondary disc 5, where primary shaft 6 is in communication with diffuser 8 and adapted to support and guide primary disc 4 and allow fluid flow through primary shaft 6; secondary shaft 7 disposed within valve body fluid passageway 22 and configured to support and guide secondary disc 5; secondary spring 11 disposed intermediate secondary shaft 7 and secondary disc 5 and configured to urge secondary disc 5 to a closed position; inner body valve seat support 9, which may act as a retention ring, disposed proximate to fluid outlets 32a,32b and configured to do not disrupt fluid flow within ring disc nozzle check valve 100 as the fluid passes over primary disc 4 and/or secondary disc 5; and one or more fasteners 12 configured to secure retention ring 9 to valve body 1.

Ring disc nozzle check valve 100 allows fluid flow in one direction and can act as a relief valve and comprises valve body 1 which defines valve body fluid passageways 20,22 therethrough; primary seat 2 disposed in valve body fluid passageways 20,22 proximate fluid inlet 30; primary disc 4 disposed in valve body fluid passageways 20,22 proximate fluid inlet 30 and in communication with primary seat 2; secondary disc 5 nested within valve body fluid passageways 20,22, where secondary disc 5 defines secondary seat 3 at a peripheral edge of primary disc 4; diffuser 8 disposed in the valve body fluid passageway 20 proximate fluid outlets 32a,32b; primary spring 10 disposed in valve body fluid passageways 20,22 and in communication with diffuser 8 and primary disc 4, where primary spring 10 is adapted to urge primary disc 4 to a closed position; primary shaft 6 disposed within valve body fluid passageway 22 intermediate diffuser 8 and secondary disc 5, where primary shaft 6 is in communication with diffuser 8 and adapted to support and guide primary disc 4 and allow fluid flow through primary shaft 6; secondary shaft 7 disposed within valve body fluid passageway 22 and configured to support and guide secondary disc 5; secondary spring 11 disposed intermediate secondary shaft 7 and secondary disc 5 and configured to urge secondary disc 5 to a closed position; inner body valve seat support 9, which may act as a retention ring, disposed proximate to fluid outlets 32a,32b and configured to do not disrupt fluid flow within ring disc nozzle check valve 100 as the fluid passes over primary disc 4 and/or secondary disc 5; and one or more fasteners 12 configured to secure retention ring 9 to valve body 1.

A check valve is provided. The check valve includes a valve body and a piston unit. The valve body includes a valve cavity and a valve port. The valve body is provided with an inlet and an outlet. The valve port is located between the inlet and the valve cavity. The outlet is in communication with the valve cavity. The piston unit is capable of moving in the valve cavity along an axis of the valve body to open/close the valve port. The valve cavity includes a flaring portion. Along the axis of the valve body, a flow area of a cross section of the flaring portion is greater than a flow area of a cross section of the valve port.

A valve assembly that includes a valve housing and a valve body that is configured to be mated with the valve housing. The valve housing includes at least one window that extends through a wall of the valve housing, and the valve body includes at least one prong that is configured to mate with the window when the valve body is mated with the valve housing.

A check valve is provided which may be installed horizontally or in other non-vertical orientations, and used with variable frequency drives and other applications without the valve becoming misaligned. In one aspect, the valve includes a housing with an inner surface and a passage. A flange within the housing divides the housing into upstream and downstream portions, and extends around the inner surface, defining a valve seat and a valve aperture. A poppet is positioned in the downstream portion. The poppet includes a valve head and a plurality of guide legs extending from the valve head and into the downstream portion, and not through the valve aperture. The valve head is resiliently biased in the closed position against the valve seat to inhibit fluid flow in a first direction. A guide disposed within the housing receives the plurality of guide legs of the poppet valve as the poppet valve moves between an open position and a closed position.

A valve includes a valve housing defining a fluid flow passage, a valve seat extending into the fluid flow passage, a valve poppet mechanically coupled to a valve stem, the poppet engages and disengages with the valve seat, a spring extending around a portion of a periphery of the valve stem, the spring extends and contracts to close and open the fluid flow passage, the valve stem having a spring abutting surface, a pocket positioned within the fluid flow passage and having a body extending from a closed end to an open end; the spring extends through the open end when in an extended state, and when the spring is in a contracted position, the open end of the pocket abuts with the spring abutting surface of the valve stem to seal the spring within the pocket.

A system and method for maintaining the integrity of a dry pipe sprinkler system. The system includes an auxiliary drain including a main collection pipe, a heater having a bracket configured to attach the heater to the main collection pipe of the auxiliary drain, the bracket including a deflector configured to direct heat from the heater onto the main collection pipe, and a self-draining apparatus configured to receive excess water from the auxiliary drain.