Valve device for waste pipe
AssigneeMcAlpine & Company Limited
InventorJames Edward McAlpine
Life of this patent
Estimating the term…
Abstract
Plumbing apparatus (10) for incorporation in a waste pipe system comprises a tubular body having an inlet (14) for connection to an upstream waste pipe and an outlet (16) for connection to a downstream waste pipe. A one-way water valve (22) is provided in the body and is arranged to permit flow from the inlet to the outlet and to prevent flow from the outlet to the inlet. An air valve (24) is mounted on an upper portion of the body and is arranged to permit flow of air into the body and to restrict flow of air out of the body. In the event of negative pressure in the downstream waste pipe system the air valve opens to allow air to be drawn into the system. In the event of positive pressure in the downstream waste pipe system the one-way water valve closes.
Claims50
Plumbing apparatus for incorporation in a waste pipe system, the apparatus comprising:
- a tubular body having an inlet for connection to an upstream waste pipe and an outlet for connection to a downstream waste pipe;
- a one-way valve in the body arranged to permit flow from the inlet to the outlet and to restrict flow from the outlet to the inlet, and
- at least one pressure relief device on a portion of the body arranged to permit the flow of air into the body and to restrict flow of air out of the body.
The apparatus of any preceding claim, wherein apparatus comprises a plurality of pressure relief devices.
The apparatus of any preceding claim, the at least one pressure relief device comprises a pressure relief mechanism.
The apparatus of any preceding claim, wherein the at least one pressure relief device is rotatably mounted to the tubular body.
The apparatus of any preceding claim, wherein an access is provided in the tubular body for inspection and cleaning.
The apparatus of claim any preceding claim, wherein the inlet and outlet are configured to facilitate retrofitting of the apparatus in an existing waste pipe system.
The apparatus of any preceding claim, wherein air valve comprises a valve member resiliently biased against a seat.
A method of protecting a waste pipe system from pressure fluctuations comprising:
- connecting an inlet of a tubular body to an upstream waste pipe system and an outlet of the body to a downstream waste pipe system;
- providing a one-way valve in the body;
- providing at least one pressure relief device on a portion of the body;
- closing the one-way valve in response to positive pressure in the downstream waste pipe system;
- and
- activating the at least one pressure relief device in response to negative pressure in the waste pipe system.
Plumbing apparatus for incorporation in a waste pipe system substantially as described and as illustrated in the accompanying drawing.
A waste pipe system incorporating plumbing apparatus substantially as described herein.
A method of protecting a waste pipe system from pressure fluctuations substantially as described herein.
Dependencies are inferred from the claim text.