An installment method of a fluid control body and a fluid control device including a fluid control body with which processes of designing, manufacturing, and managing the fluid control body are simplified to suppress cost of manufacturing, etc, includes a cut-off step of cutting off part of a fluid pipe inside a casing, and an installment step of installing the fluid control body including an on-off valve formed by a valve seat body and a valve element, and a partition body formed by a wall portion, a lid portion, and a seal component, inside the casing in a sealed manner in a state where an operation shaft of the on-off valve is placed in a direction different from the vertical direction.

A plumbing fitting with a body having a flow path extending therethrough, and a receptacle disposed in the body is disclosed. The receptacle is arranged to releasably receive a mechanism is movable between a first operational position in which the flow path extends through the receptacle and the mechanism, and a second position in which the flow path bypasses the mechanism. In the second position, the mechanism can be released from the receptacle while a fluid flows through the flow path.

A valve assembly includes an inlet to receive a fluid into the valve assembly, an outlet to discharge the fluid from the valve assembly and a service stop coupled to the inlet or the outlet. The service stop can rotate relative to the inlet or the outlet to control a flow of the fluid through the inlet or the outlet. The service stop can include a first tool interface to receive a first hand tool and transfer a first torque from the first hand tool to the service stop to facilitate rotating the service stop using the first hand tool. The service stop can include a second tool interface to receive a second hand tool different from the first hand tool and configured to transfer a second torque from the second hand tool to the service stop to facilitate rotating the service stop using the second hand tool.

A plumbing fitting with a body having a flow path extending therethrough, and a receptacle disposed in the body is disclosed. The receptacle is arranged to releasably receive a mechanism is movable between a first operational position in which the flow path extends through the receptacle and the mechanism, and a second position in which the flow path bypasses the mechanism. In the second position, the mechanism can be released from the receptacle while a fluid flows through the flow path.

A backflow prevention assembly is disclosed including a backflow prevention valve having a valve housing including a valve inlet end and a valve outlet end; a spool spacer of predetermined length having a first end and a second end; an inlet shut-off valve; and an outlet shut-off valve, wherein the spool spacer extends between the backflow prevention valve and one of the inlet shut-off valve and the outlet shut-off valve. The entire assembly, including the backflow prevention valve, the spool spacer, the inlet shut-off valve, and the outlet shut-off valve, is a certified assembly, certified by a certifying authority prior to installation. Methods of manufacturing a backflow prevention assembly and replacing a backflow prevention assembly are also disclosed.

A valve removal method of a fluid pipeline structure, which removes an unnecessary portion of a valve device from a connection port portion side of a pipe without flow disruption in the fluid pipeline structure that detachably includes the valve device including a valve body, which is openable and closeable from a direction intersecting a flow path axis of a connection port portion, on the connection port portion side of the pipe connected to a fluid piping system includes a valve body fixing step of fixing the valve body at a closed valve position to the connection port portion side in a sealed manner; and a valve component removing step of removing other unnecessary valve components of the valve device in a state where the valve body which is fixed in a sealed manner is left on the connection port portion side.

Provided is a flow rate control apparatus capable of being used continuously when the apparatus is used in equipment that operates continuously, and a flow rate control method for the flow rate control apparatus. A flow rate of a fluid is controlled via any one of control valves disposed in branch passages, respectively. When replacement of the one control valve is determined to be necessary on the basis of a signal outputted from a monitoring portion of the one control valve, the one control valve performing flow rate control is closed, and another control valve disposed in another one of the branch passages, is opened, to perform flow rate control with a flow rate equivalent to that before the replacement. Furthermore, on-off valves disposed at upstream and downstream sides of the closed control valve are closed.

A backflow prevention assembly is disclosed including a backflow prevention valve having a valve housing including a valve inlet end and a valve outlet end; a spool spacer of predetermined length having a first end and a second end; an inlet shut-off valve; and an outlet shut-off valve, wherein the spool spacer extends between the backflow prevention valve and one of the inlet shut-off valve and the outlet shut-off valve. The entire assembly, including the backflow prevention valve, the spool spacer, the inlet shut-off valve, and the outlet shut-off valve, is a certified assembly, certified by a certifying authority prior to installation. Methods of manufacturing a backflow prevention assembly and replacing a backflow prevention assembly are also disclosed.

A backflow prevention assembly is disclosed including a backflow prevention valve having a valve housing including a valve inlet end and a valve outlet end; a spool spacer of predetermined length having a first end and a second end; an inlet shut-off valve; and an outlet shut-off valve, wherein the spool spacer extends between the backflow prevention valve and one of the inlet shut-off valve and the outlet shut-off valve. The entire assembly, including the backflow prevention valve, the spool spacer, the inlet shut-off valve, and the outlet shut-off valve, is a certified assembly, certified by a certifying authority prior to installation. Methods of manufacturing a backflow prevention assembly and replacing a backflow prevention assembly are also disclosed.

A zone valve control system for a flow valve comprising a direct current rotary electric motor connected to a valve shaft, an electronic control system comprising a microprocessor, an electric measuring device for signaling the presence of a predetermined electrical stall current, a rectifier and a regulator to convert and regulate external AC voltage to a desired DC power output; and an electrical storage system having a total storage capacity sufficient to power the DC electric motor to move the valve between the closed and opened positions; an external sensor for signaling when a certain condition exists in an external zone; the microprocessor controlling the flow and polarity of DC current to the motor; whereby the electronic control system controls movement of a valve operably connected to the output shaft to open or close a valve to maintain a desired predetermined condition in the external zone.