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VENT VALVE WITH TAPERED VENT

IP.com Disclosure Number: IPCOM000243905D
Publication Date: 2015-Oct-27
Document File: 3 page(s) / 186K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention relates to vent valves for marine service and improved design thereof Vent valves for marine service such as those used in oil and gas service may be exposed periodically to seawater The invention provides a taper on the outlet side of the vent valve to allow fluid to drain away from the valve head The taper starts at the seal seat and continues to the outer extremity of the valve The continuous tapering of the bore from the point of seal to the external edge chamfer allows fluid to drain away from the valve head very effectively without the need to increase the outer dimensions of the valve and therefore the space that they occupy on the end fittings Because there is no change to the valve on the source end where a standard fitting can be used the new design can be retro fitted to existing structures or installations if necessary replacing existing valves

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BACKGROUND

The invention relates to vent valves for marine service, and improved design thereof. Vent valves for marine service, such as those used in oil and gas service, may be periodically or continually exposed to sea water. In the case of periodic exposure the vent portion of the valves requires periodic cleaning to ensure proper operation of the valve. This cleaning may be done by freshwater jetting etc. so that salt or other deposits can be removed. Without proper salt removal the salts can build up around the vent and block it, or prevent the valve from opening. The cleaning could be a problem with current designs, as it may not always be effective due to access being restricted into the vent portion of the valve. Existing solutions to ease the maintainability of the valves include using a larger bore aperture for the vent, however it may not be possible to accommodate a larger valve in the structure. The current invention presents efficient design solutions for vent valves to improve maintainability.

BRIEF DESCRIPTION OF DRAWINGS

The invention discloses apparatus and method for improving maintainability of marine vent valves, wherein:

FIG. 1 illustrates vent valve with taper provided in outlet for effective drainage.

FIG. 2 shows vent valve outlet with curved taper.

DETAILED DESCRIPTION

The invention as illustrated in FIG. 1 and 2 provides a taper on the outlet side of the vent valve to allow fluid to drain away from the valve head. As shown in FIG. 1 the taper starts at the seal seat, and continues to the outer extremity of the valve. The continuous tapering of the bore from the point of seal to the external edge / chamfer as shown in the figure, allows fluid to drain away from the valve head very effectively without the need to increase the outer dimensions of the valve and therefore the space that they occupy on the end fittings. FIG. 1 also shows an optional screw-on anti-marine-fouling mesh made from a copper alloy which could be applied for continuous subsea use. In a variant shown in FIG. 2, the v...