A double check valve is provided that includes an in-line inlet check valve and an outlet check valve that cooperate to prevent back flow of fluid through the valve. The check valve also includes at least one vent that allows for fluid trapped within the check valve to drain, thereby preventing freezing of the check valve and hydrant to which it is interconnected. The check valve provided omits many superfluous components and thus is smaller and easier to install than check valves of the prior art.

A backflow preventer for water distribution installations includes a body having an inlet conduit arranged along an inlet axis, an outlet conduit arranged along an outlet axis, and a discharge conduit arranged along a discharge axis of the body. The backflow preventer is provided with check valves that prevent a backflow of fluid from the outlet to the inlet in the event of low pressure upstream of the backflow preventer and/or high pressure downstream of the backflow preventer. The backflow preventer further includes a discharge valve arranged along the discharge axis of the body of the backflow preventer for discharging fluid in the low and/or high pressure conditions. A discharge pipe is connected to the discharge valve to discharge the fluid outside the backflow preventer along an end discharging axis of the fluid outside the backflow preventer. Coupling elements are provided to adapt the backflow preventer to various applications for varying the angular position of the discharge pipe with respect to the body of the backflow preventer.

The present disclosure provides a backflow prevention device includes an upper chassis, a lower chassis, a seal member, and a resilient member. The upper chassis defines a receiving space passing through a bottom of the upper chassis. The lower chassis defines an air flow channel. A part of the lower chassis is accommodated in the receiving space of the upper chassis, and fixedly connected to an inner wall of the upper chassis. The upper chassis and the lower chassis are mounted to a pot. The seal member is received in the receiving space. The resilient member is resiliently mounted between the seal member and the upper chassis. The resilient power of the resilient member pushes the seal member to resist against and seal the air flow channel.

A double check valve is provided that includes an in-line inlet check valve and an outlet check valve that cooperate to prevent back flow of fluid through the valve. The check valve also includes at least one vent that allows for fluid trapped within the check valve to drain, thereby preventing freezing of the check valve and hydrant to which it is interconnected. The check valve provided omits many superfluous components and thus is smaller and easier to install than check valves of the prior art.

The present disclosure provides a backflow prevention device includes an upper chassis, a lower chassis, a seal member, and a resilient member. The upper chassis defines a receiving space passing through a bottom of the upper chassis. The lower chassis defines an air flow channel. A part of the lower chassis is accommodated in the receiving space of the upper chassis, and fixedly connected to an inner wall of the upper chassis. The upper chassis and the lower chassis are mounted to a pot. The seal member is received in the receiving space. The resilient member is resiliently mounted between the seal member and the upper chassis. The resilient power of the resilient member pushes the seal member to resist against and seal the air flow channel.

A backflow preventer that includes a housing having an inlet and an outlet adapted to be mounted in a liquid flow configuration in a liquid supply circuit. An upstream check disc assembly is positioned in the housing downstream of the inlet, and includes an upstream check plate supporting a downstream diaphragm. An upstream check disc is positioned downstream of the diaphragm and integrally formed with an upstream stem mounted in an aperture in a central hub formed in the check plate for movement between an normally open, flow position and a closed position preventing backflow of liquid through the inlet. A downstream check disc assembly is positioned in the housing downstream from the upstream check disc assembly. A vent discharges liquid to atmosphere upstream of the downstream check disc assembly.

A shower system includes a water supply conduit, a reservoir, and a valve actuator. The reservoir is fixedly coupled to the water supply conduit such that the reservoir and the water supply conduit are fluidly coupled. The valve actuator is configured for actuation between a first position in which water is supplied from the water supply conduit and a second position in which water is supplied from the reservoir. In some implementations, the shower system further includes a showerhead that is fluidly coupled to the water supply conduit and the reservoir such that water may be supplied from either the water supply conduit to the showerhead or from the reservoir to the showerhead.

A backflow preventer including a body having an inlet for connection to an upstream portion of a plumbing system and an outlet for connection to a downstream portion of the plumbing system, a first check valve and a second check valve located in the body for preventing the reverse flow of water between the outlet and the inlet. An inlet pressure zone is positioned between the inlet and the first check valve, an outlet pressure zone is positioned between the outlet and the second check valve, and an intermediate pressure zone is positioned between the first and the second check valves. Position sensors sense the positions of the check valves, and pressure sensors sense the pressures in the zone. A controller in communication with the position sensors and the pressure sensors calculates the opening and closing pressures of the check valves.

A testing device for a backflow preventer assembly has a plurality of automated valves. Each automated valve is coupled to a corresponding test valve of the backflow preventer assembly. A high side diverter array is coupled to at least one of the plurality of automated valves. A low side diverter array is coupled to at least one of the plurality of automated valves. A vent side diverter array is coupled to at least one of the plurality of automated valves. A pressure differential transmitter is coupled to the high side diverter array and the low side diverter array. A high side bleed solenoid is coupled to a high side of the pressure differential transmitter. A low side bleed solenoid is coupled to a low side of the pressure differential transmitter. A vent side bleed solenoid coupled to a vent side diverter array. A plurality of bypass solenoids is coupled to the high side bleed solenoid, the low side bleed solenoid and the vent side bleed solenoid. A first sensor is coupled to the high side bleed solenoid, the low side bleed solenoid and the vent side bleed solenoid.

A backflow preventer assembly for a water management system includes a backflow preventer, an upstream shutoff valve, a downstream shutoff valve, a flow path, a pressure meter, and a flow meter. The upstream shutoff valve is positioned upstream from the backflow preventer. The downstream shutoff valve is positioned downstream from the backflow preventer. The flow path is defined at least partially through the backflow preventer, the upstream shutoff valve, and the downstream shutoff valve. The pressure meter includes a pressure sensor. The pressure sensor is in fluid communication with the flow path. The flow meter includes a flow sensor. The flow sensor is in fluid communication with the flow path.