Fluid handling – Destructible or deformable element controlled – Destructible element
Reexamination Certificate
2000-10-16
2001-11-27
Buiz, Michael Powell (Department: 3753)
Fluid handling
Destructible or deformable element controlled
Destructible element
C137S073000, C137S080000, C169S057000, C169S058000, C239S075000
Reexamination Certificate
active
06321768
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable
BACKGROUND OF THE INVENTION
This invention relates to fluid control valves and more particularly to a high temperature fire hazard shutdown valve for interrupting fluid flow.
1. Field of the Invention
Relief valves or emergency shutdown valves for protecting equipment and piping under greater than a predetermined value for releasing or stopping the flow of fluid are well known. However, there is a need for a heat responsive valve to be interposed in a fluid conducting line which is responsive to excessive heat such as, heat generated by a fire in which a heat responsive element forms a fuse for moving a valve from an open fluid flow position to a closed position or vice versa.
2. Description of the Prior Art
The prior art generally reveals a plurality of heat responsive valves, commonly referred to as sprinkler valve heads, which are connected with a fluid fire retardant, usually water, which is released to control the fire in response to a predetermined temperature melting a fusible link maintaining the sprinkler head in valve closed position which when melted by excessive heat allows fluid to be sprayed into a predetermined area for controlling fires.
This invention provides a valve which controls the flow of fluid by allowing fluid flow therethrough in which a heat fusible plug maintains a pressure responsive collapsible pin relief valve monitoring fluid flowing through the valve and interrupts the flow by collapse of the pin in response to excessive fluid pressure with the additional feature of the heat fusible plug melting as a result of a fire and releasing one end portion of the pressure responsive collapsible pin, thus allowing fluid pressure to close the valve flow passageway.
I am not aware of any prior art valve disclosing this fluid pressure responsive, fusible plug type emergency shut-down valve.
BRIEF SUMMARY OF THE INVENTION
A valve body having spaced-apart bolt flanges for inline connection with a pipeline is provided with a flow passageway between the bolt flange ends. A transverse bore, open to one side of the body, intersects the fluid passageway and forms a shoulder for receiving a sleeve-like valve seat mating and sealing with a piston type valve, having a piston rod slideably projecting axially outward of a central bore in a bonnet head. A pressure responsive collapsible pin projects axially outward from the end of the piston rod, opposite the piston and is slideably received by a bore in a plate parallel with the valve bonnet and supported in spaced relation there-with by a plurality of bolts forming a cage means
40
. Sleeves surrounding the posts maintain the plate in spaced relation with the bonnet head and an axial threaded bore in the plate receives a plate bushing having an axial bore slideably surrounding the other end portion of the collapsible pin. An axial opening in the plate bushing opposite the collapsible pin is filled with a heat fusible alloy, such as babbitt.
The principal object of this invention is to provide a fluid pressure control emergency shutdown or relief valve having a fuse plug maintaining a pressure responsive collapsible pin holding a valve in a seated or unseated position which further includes a heat fusible plug which releases one end portion of the collapsible pin in response to a predetermined temperature for sliding movement outwardly of the valve and allowing a valve to seat or unseat for permitting or stopping fluid flow through the valve.
REFERENCES:
patent: 3338255 (1967-08-01), Exline et al.
patent: 3489160 (1970-01-01), Moore
patent: 3734114 (1973-05-01), Phillips
patent: 4896690 (1990-01-01), Taylor
patent: 000769009 (1957-02-01), None
Buiz Michael Powell
Krishnamurthy Ramesh
Rhea Robert K.
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