Control valves with adjustable valve packing
AssigneeFisher Controls International LLC
InventorYan Qiu
Life of this patent
Estimating the term…
Abstract
An example apparatus is disclosed herein comprising a valve that includes a valve body defining a fluid passageway between an inlet and an outlet, a flow control member in the fluid passageway, a stem coupled to the flow control member, and a bonnet coupled to the valve body. The stem extends through a channel in the bonnet. A section of the channel forms a bore. The bore is threaded. The apparatus includes packing in the channel to form a seal between the bonnet and the stem. The apparatus includes a worm wheel nut threadably engaged with the bore. The stem extends through an opening in the worm wheel nut. The apparatus also includes a worm meshed with the worm wheel nut. The worm is to rotate the worm wheel nut to cause the worm wheel nut to move and adjust a load on the packing.
Claims19
An apparatus comprising:
- a valve including:
- a valve body defining a fluid passageway between an inlet and an outlet;
- a flow control member in the fluid passageway;
- a stem coupled to the flow control member;
- a bonnet coupled to the valve body, the stem extending through a channel in the bonnet, a section of the channel forming a bore, the bore being threaded;
- and
- packing in the channel to form a seal between the bonnet and the stem;
- a worm wheel nut threadably engaged with the bore, the stem extending through an opening in the worm wheel nut;
- and
- a worm meshed with the worm wheel nut, the worm to rotate the worm wheel nut to cause the worm wheel nut to move and adjust a load on the packing.
An apparatus comprising:
- a valve including:
- a valve body defining a fluid passageway between an inlet and an outlet;
- a flow control member in the fluid passageway;
- a stem coupled to the flow control member;
- a bonnet coupled to the valve body, the bonnet defining a channel, the stem extending through the channel, a section of the channel forming a bore with an inner surface having first threading;
- and
- packing in the channel to form a seal between the bonnet and the stem;
- a nut at least partially in the bore, the nut having an outer surface with second threading that is meshed with the first threading, the stem extending through an opening in the nut;
- and
- a motor to, when activated, rotate the nut to cause the nut to move axially in the bore and change an axial load on the packing.
A method comprising:
- accessing a temperature value from sensor data output by a temperature sensor of a control valve system, the control valve system including a valve including packing in a channel of the valve, the temperature sensor to measure the temperature value of a gas in the channel;
- comparing the temperature value to a threshold;
- and
- in response to the temperature value satisfying the threshold, activating a motor to adjust a load on the packing, wherein activating the motor causes a nut in the channel to rotate, and rotation of the nut moves a packing load connector that is engaged with the packing.
Dependencies are inferred from the claim text.