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US 5,441,203 AGranted
Spray nozzle holder containing two valves for flow control
AssigneeLurmark Limited
InventorsTrevor W. B. Swan, John A. B. Castell
Life of this patent
Estimating the term…
Abstract
A spray nozzle holder (1) has an inlet (12) through which liquid to be sprayed is admitted and an outlet (14) for passing liquid to a nozzle tip attached in use to the holder. A check valve (50,51,52) is positioned between the inlet (12) and the outlet (14) for preventing liquid flow when the liquid pressure is below a predetermined level. A further valve (20,23,24,26) is provided to prevent liquid flow to the outlet (14) during removal or maintenance of the check valve (50,51,52).
Claims18
A spray nozzle holder comprising:
- an inlet through which liquid to be sprayed is admitted;
- an outlet for passing liquid to a nozzle tip attached in use to the holder;
- a removable check valve between said inlet and said outlet for preventing liquid flow when the liquid pressure is below a predetermined level;
- a further valve located upstream of the check valve and positionable for preventing liquid flow to said outlet during removal or maintenance of the check valve;
- and
- the check valve only being removable when the further valve is positioned to prevent liquid flow beyond the further valve.
3 more elements
A valve assembly comprising:
- a body;
- said body having an inlet through which liquid is admitted and an outlet through which liquid exits;
- a check valve between said inlet and said outlet for preventing liquid flow when the liquid pressure is below a predetermined level;
- a further valve for preventing liquid-flow to said outlet during removal or maintenance of the check valve;
- a cap which is rotatably fixed to the body and which covers the check valve;
- the arrangement being such that the cap can only be removed when rotated to a particular orientation, at which orientation liquid flow to the outlet is prevented.
3 more elements
A spray nozzle holder comprising:
- an inlet through which liquid to be sprayed is admitted;
- an outlet for passing liquid to a nozzle tip attached in use to the holder;
- a check valve removably mounted between said inlet and said outlet for preventing liquid flow when the liquid pressure is below a predetermined level;
- a further valve located between the inlet and the outlet upstream of the check valve;
- and
- a cap for releasably securing the check valve in the holder and being operatively coupled to the further valve, said further valve being positionable by the cap for preventing liquid flow to said outlet and the check valve being releasably removable by the cap only when the further valve is positioned to prevent liquid flow to the outlet.
3 more elements
Dependencies are inferred from the claim text.