Abstract: A spring stop arrangement for a check valve may include: a check seat defining a flow path; a clapper assembly connected to the check seat and configured to obstruct the flow path, the clapper assembly including: a clapper; and a seal retainer detachably mounted to the clapper; a cam arm connected to the check seat, the cam arm including a stopper; and a torsion spring operatively connected to the cam arm so as to apply a biasing force to the cam arm against the direction of fluid flow. When the seal retainer is dismounted from the clapper, the stopper may be configured to contact the check seat so as to prevent rotation of the cam arm.

Abstract: A check valve may include: a check seat defining a flow path; a clapper assembly hingedly connected to the check seat and configured to obstruct the flow path, including: a clapper and a seal retainer detachably mounted to the clapper; a first extension extending from the clapper assembly in an upstream direction and having a roller; a cam arm rotatable relative to the clapper assembly and configured to engage with the roller; and a torsion spring operatively connected to the cam arm so as to apply a biasing force to the cam arm in the upstream direction. The biasing force may be imparted to the clapper assembly via the cam arm and roller, so that the clapper assembly obstructs the flow path.

Abstract: An accumulator assembly having a wastewater retention tank defining an interior chamber. A fluid level sensor is coupled to the waste retention tank and configured to sense a level of liquid in the chamber. An extraction pipe extends into the chamber and is coupled to an extraction valve. Coupled to the fluid sensor is a controller that is also coupled to the fluid level sensor and to the extraction valve. The controller is configured to open the extraction valve upon receipt of a signal from the sensor. The accumulator assembly also includes an odor mitigation subassembly in fluid communication with the chamber. The odor mitigation subassembly further includes an air displacement port, an odor filter and an overflow prevention device, the overflow prevention device being in fluid communication with the chamber and located downstream of the air displacement port and upstream of the filter.

Abstract: A backflow prevention device includes a main pipe body extending along a first center longitudinal axis, at least one check valve disposed within the main pipe body, an inlet pipe connected to an inlet side of the main pipe body, and an outlet pipe connected to an outlet side of the main pipe body. The inlet pipe and the outlet pipe extend along a second center longitudinal axis. The first center longitudinal axis is offset with respect to the second center longitudinal axis in a direction perpendicular to the first and second center longitudinal axes. A center of the valve seat of the at least one check valve is offset with respect to the second center longitudinal axis in the direction perpendicular to the first and second longitudinal axes.

Abstract: A ligature resistant strainer for a drain assembly and connecting to a drain system. The strainer includes a grate and an extension block coupled to the grate. The grate defines a first thickness, and the extension block defines a second thickness that is greater than the first thickness. Portions of the grate cooperate with portions of the extension block to define a plurality of apertures extending through the strainer and inhibiting attachment of a ligature to the strainer.