Control valves

Claim 2

In a control valve comprising a body having inlet and outlet connections and a valve seat formed there between, a bonnet on said body, a valve plug in said body adapted to open and close upon said valve seat, a valve stem extending through said bonnet, said valve plug having a hollow shank portion receiving said valve stem and loosely slidable thereon, manual operating means for said valve stem to open or close said valve plug upon said valve seat, said manual operating means including nonrising stem means between said valve plug and said bonnet, and a spring between said valve plug and said valve stem for normally urging said valve plug towards said valve seat, whereby said valve plug also serves as a check valve.

Claim 3

In a control valve comprising a body having inlet and outlet connections and a valve seat formed around said inlet, a bonnet on said body, a valve stem supported in said bonnet, nonrising stem means between said valve stem and said bonnet, a hollow valve plug loosely slidable on the end of said valve stem and adapted to open and close upon said valve stem, a spring around said valve stem extending between said valve stem and said valve plug for normally urging said valve plug into engagement with said valve seat, inlet fluid flow forcing said valve plug off of said valve seat and upon reverse flow said valve plug closing upon said valve seat under control of said spring to serve as a check valve, and a manual operating means on said bonnet adapted to tightly close said valve plug upon said valve seat to shut off the fluid flow or to throttle the valve plug to regulate the flow rate through the control valve.

Claim 4

In a control valve comprising a body having inlet and outlet connections and a valve seat formed around said inlet, a bonnet on said body, a valve stem supported in said bonnet, nonrising stem means between said valve stem and said bonnet, a hollow valve plug loosely slidable on the end of said valve stem and adapted to open and close upon said valve stem, a spring around said valve stem extending between said valve stem and said valve plug for normally urging said valve plug into engagement with said valve seat, inlet fluid flow forcing said valve plug off of said valve seat and upon reverse flow said valve plug closing upon said valve seat under control of said spring to serve as a check valve, and a manual operating means on said bonnet adapted to tightly close said valve plug upon said valve seat to shut off the fluid flow or to throttle the valve plug to regulate the flow rate through the control valve.

Claim 5

In a control valve comprising a valve body having an inlet and an outlet and a valve seat formed around said inlet, a bonnet on said body opposite said valve seat, a valve stem supported from said bonnet, nonrising valve stem means between said valve stem and said bonnet, a hollow valve plug loosely slidable from the end of said valve stem, a spring around said valve stem normally urging said valve plug into seating engagement with said valve seat in the absence of fluid flow from the inlet, at low pressure, or balanced pressure, normal fluid flow through said control valve forcing said valve plug oFf of said seat against the pressure of said spring, said valve stem being manually adjustable to control the opening of said valve plug to a value in accordance with the desired rate of fluid flow through said control valve, or shutting off the fluid flow, said valve plug automatically closing upon said valve seat upon reverse fluid flow through said control valve.

Claim 6

In a control valve comprising a valve body having an inlet and an outlet and a valve seat formed around said inlet, a bonnet on said body opposite said valve seat, a valve stem supported from said bonnet, nonrising valve stem means between said valve stem and said bonnet, a hollow valve plug loosely slidable from the end of said valve stem, a spring around said valve stem normally urging said valve plug into seating engagement with said valve seat in the absence of fluid flow from the inlet, at low pressure, or balanced pressure, normal fluid flow through said control valve forcing said valve plug oFf of said seat against the pressure of said spring, said valve stem being manually adjustable to control the opening of said valve plug to a value in accordance with the desired rate of fluid flow through said control valve, or shutting off the fluid flow, said valve plug automatically closing upon said valve seat upon reverse fluid flow through said control valve.

Claim 7

The control valve as claimed in claim 3, in which the valve plug has a hollow shank portion into which the end of the valve stem extends and in which in the absence of fluid flow, at low pressure or balanced pressure, the spring closes the valve plug upon the valve seat so the end of the valve stem is spaced from the bottom of the hollow shank portion.

Claim 8

The control valve as claimed in claim 3, in which the valve plug has a hollow shank portion into which the end of the valve stem extends, and in which the spring for urging the valve plug against the valve seat surrounds the shank portion and abuts the rear side of the valve plug.

Claim 9

The control valve as claimed in claim 3, in which the valve plug has a hollow shank portion into which the end of the valve stem extends, and in which the spring for urging the valve plug against the valve seat surrounds the shank portion, said valve stem being adjustable to regulate the fluid flow rate through the valve, such flow forcing said valve plug open from its valve seat to the regulated position in which the bottom of the hollow shank portion engages the lower end of the valve stem.

Claim 10

The control valve as claimed in claim 3, in which the valve plug is provided with a hollow shank portion receiving the valve stem, the shank portion being surrounded by the spring and the spring engaging the rear side of the valve plug, said valve plug having a flexible nose portion engaging said valve seat.

Claim 11

The control valve as claimed in claim 7, in which the valve seat is surrounded by an upstanding counter bore in which the valve plug is recessed but slightly spaced from the sidewalls of the counter bore.

Claim 12

The control valve as claimed in claim 6, in which the hollow shank portion of the valve plug is provided with an opening extending from the inside of the shank portion to the rear outside of said valve plug in order to release the pressure inside the shank portion and below the valve stem when the valve plug is opened from the valve seat.

Claim 13

The control valve as claimed in claim 6, in which the hollow shank portion of the valve plug surrounds the valve stem and is spaced therefrom so there is a loose fit between them, said loose fit and space enabling said valve plug to center itself upon its valve seat during throttle flow of fluid, and serving to relieve the pressure inside the hollow shank portion below the end of the stem when the valve plug is opened from its valve seat by the fluid pressure.

Claim 14

In a control valve comprising a valve body having an inlet and an outlet and a valve seat formed around said inlet, a bonnet on said body opposite said valve seat, a valve stem extending through said bonnet, nonrising stem means between said bonnet and said valve stem comprising interfitting lugs and slots whereby rotation of said valve stem is prevented while axial movement toward said valve seat is produced, a hollow valve plug having a shank portion loosely slidable from the end of said valve stem, a spring around said valve stem and shank portion urging said valve plug towards seating engagement with said valve seat in the absence of fluid flow, at low pressure, or balanced pressure, said valve stem being manually adjustable to control the position of said valve plug with respect to the fluid rate of flow desired, said adjustment also adapted to close said valve plug upon said valve seat to shut off the fluid flow, said valve plug also automatically closing upon said valve seat upon reverse fluid flow through said control valve, said valve plug arranged for slight rotary positioning of the shank portion with respect to said valve stem each time To seat upon different positions of said valve seat.

Claim 15

In a control valve comprising a valve body having an inlet and an outlet and a valve seat formed around said inlet, a bonnet on said body opposite said valve seat, a valve stem extending through said bonnet, nonrising stem means between said bonnet and said valve stem comprising interfitting lugs and slots whereby rotation of said valve stem is prevented while axial movement toward said valve seat is produced, a hollow valve plug having a shank portion loosely slidable from the end of said valve stem, a spring around said valve stem and shank portion urging said valve plug towards seating engagement with said valve seat in the absence of fluid flow, at low pressure, or balanced pressure, said valve stem being manually adjustable to control the position of said valve plug with respect to the fluid rate of flow desired, said adjustment also adapted to close said valve plug upon said valve seat to shut off the fluid flow, said valve plug also automatically closing upon said valve seat upon reverse fluid flow through said control valve, said valve plug arranged for slight rotary positioning of the shank portion with respect to said valve stem each time To seat upon different positions of said valve seat.

Claim 16

In a control valve, a body having an inlet and an outlet, a valve seat in said body and a valve plug in said body adapted to close on said seat and control water flow from the inlet to the outlet, a valve stem mounted in said body, said valve plug being slideable on said stem, spring means normally urging said valve plug to close on said seat, and means operable from outside said body to cause said valve stem to hold said valve plug in closing position on said seat.

Claim 17

In a control valve, a body having an inlet and an outlet, a valve seat in said body and a valve plug in said body adapted to close on said seat and control water flow from the inlet to the outlet, a valve stem mounted in said body, said valve plug being slideable on said stem, spring means normally urging said valve plug to close on said seat, and means operable from outside said body to cause said valve stem to hold said valve plug in closing position on said seat.

Claim 18

The structure of claim 12 further characterized in that the means operable from outside said body variably position the valve stem within the body to control movement of said valve plug relative to said seat.