A valve assembly with a spring retention assembly including an elongated cylinder portion having an open threaded end and a closed end and an elongated piston portion having a free end and a threaded tab end configured to thread through the open threaded end and, thereby, be slideably captured in the cylinder portion. A spring couples to the body portion and the piston portion to provide a force to urge the body portion and the piston away from one another, wherein the closed end and the free end are similarly shaped so that the spring retention assembly can be reversibly mounted to a valve member that can also be reversibly mounted.

A system and method for providing improved water line installation, and more specifically, to a system and method for providing a positive stop flow pipe isolation insert for use in installing water lines to an existing and active main water line is disclosed. The positive stop flow pipe isolation insert includes a water system pipe isolation insert segment connected to mechanical gate valve attached to a water system. The water system pipe isolation insert segment is coupled together with a solid inner core center on its opposite end. A water main pipe isolation insert segment is coupled to the solid inner core center and to the water main pipe on the other. Each of the pipe segments possess a 2″ c.c. threaded hole along a common center line of the pipe segments. A backflow preventer may be attached to the positive stop flow pipe isolation insert using the pair of 2″ c.c. threaded holes to use during pressure testing and chlorination.

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 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.

There is provided a system separator having a backflow preventer including a housing enclosing a main flow conduit, a valve seat inside the housing on the main flow conduit, and a valve body movable relative to the valve seat to close off the main flow conduit together with the valve seat in a closed position and to release the main flow conduit in an open position. The valve body is alternately movable between the closed position and the open position by at least one of a pressure difference in the main flow conduit or a force of a spring element, and the main flow conduit is divided in the area of the valve body into at least one outer flow conduit and one inner flow conduit, and the valve body encloses the inner flow conduit and forms at least one valve-body valve seat on the inner flow conduit.

A holder including a holding body configured for displaceable attachment to a rod and including a rod passage opening for the rod, and a clamping unit movable between a clamp position and an enable position. The clamping unit, in case of the holding body attached to the rod, in the enable position is capable of enabling a shifting movement of the holding body along the rod and in the clamp position is capable of exerting a clamping force to block a shifting movement of the holding body along the rod. An operating unit is provided for user-operated moving of the clamping unit between the clamp position and the enable position. The clamping unit is a wrap spring unit wrapping around the rod passage opening and comprising a plurality of wrap springs disposed adjacent to each other in a longitudinal axis direction of the rod passage opening, each spring wrapping around the rod passage opening over more than 180°, and/or a wrap spring wrapping around the rod passage opening over more than 360°, wherein the respective wrap spring is movable by the operating unit between a constricting condition providing the clamp position of the clamping unit and an enlarging condition providing the enable position of the clamping unit.

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.

An improved backflow assembly apparatus is contemplated. The apparatus having a backflow assembly, the backflow assembly having a body, an inlet, a first valve control assembly connecting the inlet to the body, an outlet, and a second valve control assembly connecting the outlet to the body, and a flushing system connected to the body of the backflow assembly, the flushing system having an access lid for connecting directly to the body, a relief valve connected to the access lid, and a flushing hose attached to the relief valve.

A valve assembly having a body forming a bucket having a sidewall extending between an open end and a closed end along a bucket axis. A first conduit and a second conduit extend from the sidewall, wherein the first and the second conduits extend along a conduit axis that is perpendicular to the bucket axis. A frame inserts into the bucket along the bucket axis and includes a valve seat and a valve member biased against the valve seat. A guide is provided in the bucket between the closed end and the frame and extends along a guide axis between a first opening arranged in a first plane and aligned to receive fluid flow from the first conduit and a second opening arranged in a second plane and aligned to direct fluid flow through the valve seat. The first and second planes are not parallel to one another.

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.