Abstract: Embodiments of the invention relate to a first stage pressure reducing valve having a tubular plug, particularly for regulators of scuba breathing apparatus. According to embodiments of the invention, at least a portion of the outer surface of the valve has fins for heat exchange with the outside environment, designed to prevent or reduce the formation of ice caused by the temperature drop generated by gas expansion inside the valve.

Abstract: The invention relates to a first stage pressure reducing valve having a tubular plug, particularly for regulators of scuba breathing apparatus. According to the invention, at least a portion of the outer surface of the valve has fins (19, 19?) for heat exchange with the outside environment, designed to prevent or reduce the formation of ice (18) caused by the temperature drop generated by gas expansion inside the valve.

Abstract: A membrane valve wherein the shutter disk is retained in contact with the valve seat during ejection of liquid or gas by means of one or more ribs that are substantially in contact with the shutter disk along one or more lines secant to the shutter disk and/or by means of one or more rows of secondary clamping pins that are engaged in matching openings on the valve seat. Further, a second stage pressure reducer for two-stage underwater regulators incorporating a membrane valve wherein the shutter disk is retained in contact with the valve seat during exhalation of gas by means of one or more ribs that are substantially in contact with the shutter disk along one or more lines secant to the shutter disk and/or by means of one or more rows of secondary clamping pins that are engaged in matching openings on the valve seat.

Abstract: A device (7, 8, 10) is provided for retaining free loose ends of tightening or fastening straps (5) or belts, or the like, particularly in articles for wearing, and more particularly in buoyancy compensator vests for underwater diving. A free end is a part of a segment of a strap or belt (5) which is secured by the other end to a first part (101) of the article, which first part (101) is designed to be connected to a second part (102) of the article, by said segment of the strap or belt (5). The second part (102) is connected in an intermediate portion of the segment of the strap or belt (5), whereby said segment of the strap or belt (5) is divided into a portion (105) for connecting the two parts (101, 102) of the article, and a free loose portion (205). The segment of the strap or belt (5) is connected to said first part (101) in a permanent manner, a widened member (7, 8, 10) being provided for fastening and retaining an end of the segment of the strap (5) to the corresponding first part (101).

Abstract: A regulator for underwater breathing apparatus comprising a first stage regulator, a second stage regulator, and a hose, wherein one or more thermally conductive inserts are positioned between the first stage regulator, the second stage regulator, and the hose, causing a heat transfer between the surrounding water and the breathing gas. This invention further relates to a regulator for underwater breathing apparatus wherein breathing resistance is decreased or eliminated by providing one or more expansion tanks that store breathing gas and that are positioned between the first stage regulator, the second stage regulator, and the hose. In one embodiment, the thermally conductive inserts also act as expansion tanks.

Abstract: A membrane valve wherein the shutter disk is retained in contact with the valve seat during ejection of liquid or gas by means of one or more ribs that are substantially in contact with the shutter disk along one or more lines secant to the shutter disk and/or by means of one or more rows of secondary clamping pins that are engaged in matching openings on the valve seat. Further, a second stage pressure reducer for two-stage underwater regulators incorporating a membrane valve wherein the shutter disk is retained in contact with the valve seat during exhalation of gas by means of one or more ribs that are substantially in contact with the shutter disk along one or more lines secant to the shutter disk and/or by means of one or more rows of secondary clamping pins that are engaged in matching openings on the valve seat.

Abstract: A second stage pressure reducer for two-stage scuba regulators, comprising gas supply chamber; an elastic diaphragm; an inlet, connected to the gas supply chamber through an orifice; a tubular element, conveying breathing gas from the orifice to the gas supply chamber; a poppet stem, housed inside the tubular element; a poppet seat, affixed to the poppet stem and causing the orifice to open or close; a poppet spring, causing the poppet stem to slide; centering tabs, protruding from the poppet stem and maintaining the poppet stem in a constant axial position and further allowing the poppet stem to slide axially; a guide system for preventing axial rotation of the poppet stem but not axial sliding; and a demand lever, causing translations of the poppet stem as a consequence of diaphragm movements. The guide system may be a system of grooves, rails or a combination thereof.

Abstract: A valve for underwater aqualung supplying devices, including a pressure chamber and a watertight compensation chamber adjacent and watertightly separated by a partition wall. A shutter including a tubular stem inserted, at least in part, inside each chamber. The pressure chamber connected to a pressurized gas source and a housing suitable for cooperating with an end connected with the shutter. The compensation chamber is provided with at least one opening communicating with the outside and a stem end in the shape of an expansion enlarged head connected with the valve outlet. A coil spring is watertightly driven into the chamber between the expansion head and the partition wall. In the valve the enlarged expansion head of the shutter is encircled by a thermal insulating annular part watertightly positioned between the head and the side wall of the compensation chamber.

Abstract: A diving and swimming mask, comprising a mask body made of a soft material which has at least one front opening around the eye region, which opening is closed by a transparent member, particularly a lens and there being provided, at each lateral side of the mask, attachment points for attaching an end of a strap and/or a buckle element for engagement of an end of a strap for fastening the mask against the user's face. According to the invention, when worn by the user the transparent member is positioned inclined or may be positioned inclined against the face of the user at the lower edge of the said transparent member, i.e. at the edge nearest to the user's mouth so that the upper edge of the transparent element is nearer to the user's face at the said lower edge, than at the opposite upper edge of the said transparent element.

Abstract: Diving mask with compensation consisting of an outer frame, suitably shaped, and of an inner face connected to said outer frame. The frame is formed by a body shaped so as to house the diver's nose and provided on the side of at least one nostril of the diver's nose with structure for the compression of said nostril, and on the side of the other nostril with at least one abutment for said nostril. The compression structure is secured to the body and can be operated by the diver from the outside of the mask.

Abstract: The invention relates to a first stage pressure reducing valve having a tubular plug, particularly for regulators of scuba breathing apparatus. According to the invention, at least a portion of the outer surface of the valve has fins (19, 19′) for heat exchange with the outside environment, designed to prevent or reduce the formation of ice (18) caused by the temperature drop generated by gas expansion inside the valve.

Abstract: The invention relates to a pressure reducing valve having a piston-like plug, and whose output pressure is automatically controlled relative to ambient pressure, particularly for scuba breathing apparatus regulators. According to the invention, an antifriction member (18) is interposed between the pad (13) which forms the valve seat and cooperates with the tubular plug (8) and the threaded stem (17) for adjusting the axial position of the pad (13), which antifriction member is free to rotate and to slide axially and prevents any direct contact between the pad and the adjustment threaded stem (17), thereby preventing the threaded stem from driving the pad along (13) into rotation. The antifriction member may be a disk (18) made of a relatively hard material with an appropriate surface smoothness, such as stainless steel or tungsten or a plastic material known with the trade name DELRIN, or the like.

Abstract: The invention relates to a swim fin, comprising a seat for the foot, the so-called footpocket (1) and a propelling blade (102, 202), the fin being composed of at least two materials, whereof one is comparatively rigid and substantially inextensible and the other is comparatively soft, i.e. has a different rigidity and/or is extensible. According to the invention, the at least one comparatively rigid material forms a frame (4) for the blade (102, 202) and/or footpocket (1), designed to be overmolded with the part/s (101, 201, 301, 302, 402, 502, 105) made of the at least one comparatively soft material, which complete and/or connect and/or cover, at least partly, the parts of the frame (4).

Abstract: A diving and swimming mask, comprising a mask body (1) made of a soft material which has at least one front opening around the eye region, which opening is closed by a transparent member, particularly a lens (2) and there being provided, at each lateral side of the mask, means for attaching an end of a strap and/or a buckle element for engagement of an end of a strap for fastening the mask against the user's face. According to the invention, when worn by the user the transparent member is positioned inclined or may be positioned inclined against the face of the user at the lower edge of the said transparent member, i.e. at the edge nearest to the user's mouth so that the upper edge of the transparent element is nearer to the user's face at the said lower edge, that at the opposite upper edge of the said transparent element.

Abstract: An air valve of a balancing jacket can be opened not only by a conventional driving cable located within the corrugated pipe of the balancing jacket, but also independently from the conventional driving cable by an auxiliary driving member integral or operationally connected with the valve element of an air valve and controlled by the diver directly with his hands and/or by a separate control member.

Abstract: The invention relates to a pressure reducing valve having a piston-like plug, and whose output pressure is automatically controlled relative to ambient pressure, particularly for scuba breathing apparatus regulators. According to the invention, an antifriction member (18) is interposed between the pad (13) which forms the valve seat and cooperates with the tubular plug (8) and the threaded stem (17) for adjusting the axial position of the pad (13), which antifriction member is free to rotate and to slide axially and prevents any direct contact between the pad and the adjustment threaded stem (17), thereby preventing the threaded stem from driving the pad along (13) into rotation. The antifriction member may be a disk (18) made of a relatively hard material with an appropriate surface smoothness, such as stainless steel or tungsten or a plastic material known with the trade name DELRIN, or the like.

Abstract: The invention relates to a swim fin, comprising a seat for the foot, the so-called footpocket (1) and a propelling blade (102, 202), the fin being composed of at least two materials, whereof one is comparatively rigid and substantially inextensible and the other is comparatively soft, i.e. has a different rigidity and/or is extensible. According to the invention, the at least one comparatively rigid material forms a frame (4) for the blade (102, 202) and/or footpocket (1), designed to be overmolded with the part/s (101, 201, 301, 302, 402, 502, 105) made of the at least one comparatively soft material, which complete and/or connect and/or cover, at least partly, the parts of the frame (4).

Abstract: Aeration tube provided on its lower end with a mouthpiece (2) and on its upper end with an air intake hole (41), such tube consisting in its length of two or more tubular elements (1, 3) connected in such a way that the tube can be folded two or more times on itself.

Abstract: Diving mask with compensation consisting of an outer frame, suitably shaped, and of an inner face connected to said outer frame. Said frame is formed by a body shaped so as to house the diver's nose and provided on the side of at least one nostril of the diver's nose with means for the compression of said nostril, and on the side of the other nostril with at least one abutment for said nostril. Said compression means are secured to the body and can be operated by the diver from the outside of the mask.

Abstract: A poppet seat for air regulating devices, such as underwater diving equipment, includes a metal or plastic substrate around and through which synthetic or rubber seat material is molded. In its preferred form, this seat material surrounds the sides of the substrate and fills holes therein as well as an annular v-groove formed in the periphery of the substrate to further enhance the mechanical bond between the substrate and seat material.