The present disclosure relates to coupling device and valve assembly for use with accessing the water flow in a fire hydrant. Specifically, the present disclosure relates to various coupling device and valve assemblies which are used as a quick connect and disconnect of a fire hose to the hydrant. Additionally, it is advantageous that the coupling device and valve assemblies also provide a self-sealing valve feature, which immediately stops the flow of water when the hose is disconnected from the hydrant. An advantage provided by the present coupling device and valve assemblies is that should a primary valve on a hydrant become unusable, the fire hose can be quickly disconnected from that hydrant and reconnected to a second hydrant without requiring a shutdown of the water grid feeding the disconnected hydrant.

A valve assembly for a hydrant can include a main valve defining a bore; and an auxiliary valve assembled to and extending through the bore of the main valve, the auxiliary valve defining a fluid channel through the auxiliary valve, the auxiliary valve including: an upper auxiliary valve shaft; a lower auxiliary valve shaft, the upper auxiliary valve shaft movable in a vertical direction with respect to the lower auxiliary valve shaft, a position of the lower auxiliary valve shaft restrained with respect to a position of the upper auxiliary valve shaft within a predetermined movement range; and a sealing element preventing fluid flow through the fluid channel.

A valve assembly for a hydrant can include a main valve defining a bore; and an auxiliary valve assembled to and extending through the bore of the main valve, the auxiliary valve defining a fluid channel through the auxiliary valve, the auxiliary valve including: an upper auxiliary valve shaft; a lower auxiliary valve shaft, the upper auxiliary valve shaft movable in a vertical direction with respect to the lower auxiliary valve shaft, a position of the lower auxiliary valve shaft restrained with respect to a position of the upper auxiliary valve shaft within a predetermined movement range; and a sealing element preventing fluid flow through the fluid channel.

An embodiment of a valve, such as a water valve, includes a body, a sleeve, and a rod. The body includes a body cavity, and the sleeve is removably disposable within the body cavity and includes a sleeve cavity. And the rod is movably disposable within the sleeve cavity and is configured to form a fluid-tight seal between the body cavity and the sleeve cavity while the rod is in a closed position and is configured to allow a fluid to flow from the body cavity to the sleeve cavity while the rod is in an open position. Furthermore, one or more components of the valve each can be made partially or fully from one or more polymers.

The present disclosure relates to coupling device and valve assembly for use with accessing the water flow in a fire hydrant. Specifically, the present disclosure relates to various coupling device and valve assemblies which are used as a quick connect and disconnect of a fire hose to the hydrant. Additionally, it is advantageous that the coupling device and valve assemblies also provide a self-sealing valve feature, which immediately stops the flow of water when the hose is disconnected from the hydrant. An advantage provided by the present coupling device and valve assemblies is that should a primary valve on a hydrant become unusable, the fire hose can be quickly disconnected from that hydrant and reconnected to a second hydrant without requiring a shutdown of the water grid feeding the disconnected hydrant.

The shut-off element of a hydrant has a main valve body and a sealing surface that can be brought into mutual sealing contact, of which the sealing surface at least in sections is provided with a recess on the inner circumference.

An improved hydrant structure with an integral piston set is provided with the hydrant main body having a valve chamber for receiving a water control valve. The water control valve is composed of a valve member, rubber pads, a piston cylinder with an integrally enclosed structure and a piston rod disposed inside the valve member, a valve rod, a cover, a valve cap, and a rotary button; the outer side of the piston cylinder is formed with different outer diameters, and the preset portions thereof are formed with a water inlet and a water outlet holes, such that the piston rod can be adjusted to alter the relative relation, thereby achieving functions of starting/terminating water supply and adjusting water mixing ratio. The piston cylinder with an integrally enclosed structure is formed through a stainless steel base pipe and a plastic sleeve member enclosing the exterior thereof.

A main valve assembly and a method of forming the same which can contain sensors therein that are in contact with water below the main valve and provide water characteristic signals above ground to a water characteristic monitoring device at atmospheric pressure.

A main valve assembly and a method of forming the same which can contain sensors therein that are in contact with water below the main valve and provide water characteristic signals above ground to a water characteristic monitoring device at atmospheric pressure.

The present disclosure relates to coupling device and valve assembly for use with accessing the water flow in a fire hydrant. Specifically, the present disclosure relates to various coupling device and valve assemblies which are used as a quick connect and disconnect of a fire hose to the hydrant. Additionally, it is advantageous that the coupling device and valve assemblies also provide a self-sealing valve feature, which immediately stops the flow of water when the hose is disconnected from the hydrant. An advantage provided by the present coupling device and valve assemblies is that should a primary valve on a hydrant become unusable, the fire hose can be quickly disconnected from that hydrant and reconnected to a second hydrant without requiring a shutdown of the water grid feeding the disconnected hydrant.