Shut-in spray gun for high pressure water blast cleaning
First Claim
1. Valve apparatus for use in a high pressure fluid blast cleaning operations, comprising:
- a body having an inlet for a source of fluid under high pressure and an outlet for the discharge of fluid under high pressure, said body having a bore communicating said inlet and said outlet;
tubular guide means removably positioned in said bore and defining a valve seat;
valve means positioned in said guide means and having a closure element movable longitudinally between a closed position where said element engages said seat to shut off flow between said inlet and outlet and an open position where said element is spaced from said seat to permit flow from said inlet to said outlet;
hydraulically operable means including a resultant transverse area of said valve means responsive to said pressure for biasing said valve means toward said closed position, said biasing means being defined in part by a first diameter of engagement of said closure element with said seat and a second diameter of sealing contact between said valve means and said guide means, said first diameter being less than said second diameter to provide said resultant transverse area so that said pressure generates force which tends to shift said closure element against said seat; and
actuating means for shifting said valve means to said open position.
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Accused Products
Abstract
In accordance with an illustrative embodiment of a high pressure water blast gun as disclosed herein, such gun includes a valve body having inlet and outlet ports and an internal chamber, and a removable valve cartridge in the chamber which includes a guide tube and a valve closure element slidably arranged in the tube. The closure element includes a leading end portion having a peripheral edge that engages an inclined seat surface in the guide tube with line contact on a first diameter, and a trailing end portion which is sealed against the guide tube on a second diameter which is greater than the first diameter to provide a hydraulic bias force that tends to close the valve against the seat. Both hand and foot operated embodiments are disclosed.
121 Citations
19 Claims
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1. Valve apparatus for use in a high pressure fluid blast cleaning operations, comprising:
- a body having an inlet for a source of fluid under high pressure and an outlet for the discharge of fluid under high pressure, said body having a bore communicating said inlet and said outlet;
tubular guide means removably positioned in said bore and defining a valve seat;
valve means positioned in said guide means and having a closure element movable longitudinally between a closed position where said element engages said seat to shut off flow between said inlet and outlet and an open position where said element is spaced from said seat to permit flow from said inlet to said outlet;
hydraulically operable means including a resultant transverse area of said valve means responsive to said pressure for biasing said valve means toward said closed position, said biasing means being defined in part by a first diameter of engagement of said closure element with said seat and a second diameter of sealing contact between said valve means and said guide means, said first diameter being less than said second diameter to provide said resultant transverse area so that said pressure generates force which tends to shift said closure element against said seat; and
actuating means for shifting said valve means to said open position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a body having an inlet for a source of fluid under high pressure and an outlet for the discharge of fluid under high pressure, said body having a bore communicating said inlet and said outlet;
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9. A valve cartridge assembly for use in a high pressure water blast gun, comprising:
- a generally tubular guide member having axially spaced flow ports and an internal inclined seat surface arranged between said flow ports; and
a valve element slidably positioned in said guide member, said valve element including a head portion having sealing contact with said guide member and adapted to engage said seat to prevent fluid flow through said blast gun, said valve element further including a trailing portion having an outer surface that is sealed with respect to said guide member on a diameter that is greater than the diameter of said sealing contact of said head portion, the difference in transverse areas defined by said diameters producing a hydraulic bias force which tends to shift said valve head against said seat. - View Dependent Claims (10, 11, 12)
- a generally tubular guide member having axially spaced flow ports and an internal inclined seat surface arranged between said flow ports; and
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13. A valve closure element for use in a high pressure water blast gun, comprising:
- a cylindrical leading portion and a cylindrical trailing portion connected to one another by a reduced diameter central portion, said leading portion providing a valve head and having an outer diameter;
means on said valve head adapted to engage a seat surface to prevent fluid flow, said trailing portion having an outer diameter that is greater than said outer diameter of said leading portion to define a differential area on which pressures can act to force said valve head against the seat. - View Dependent Claims (14, 15, 16)
- a cylindrical leading portion and a cylindrical trailing portion connected to one another by a reduced diameter central portion, said leading portion providing a valve head and having an outer diameter;
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17. Valve apparatus for use in a high pressure fluid blast cleaning operation, comprising:
- a valve body having an inlet for a source of fluid under high pressure and an outlet for the discharge of fluid under high pressure, said body having a bore communicating said inlet and said outlet;
tubular guide means removably positioned in said bore and defining a valve seat;
valve means positioned in said guide means and movable between a closed position where said element engages said seat to shut off flow between said inlet and outlet and an open position where said element is spaced from said seat to permit flow from said inlet to said outlet;
hydraulically operable means including a resultant transverse area of said valve means for biasing said valve means toward said closed position in response to pressure at said inlet, said resultant transverse area being defined in part by a first, lesser diameter of engagement of said valve means with said guide means and a second, greater diameter of sealing contact of said valve means with said guide means; and
foot-operated means for shifting said valve means to said open position against the bias of said hydraulically operable means. - View Dependent Claims (18, 19)
- a valve body having an inlet for a source of fluid under high pressure and an outlet for the discharge of fluid under high pressure, said body having a bore communicating said inlet and said outlet;
Specification