Abstract: Pressure volume regulator (20) for control of supply and pressure of barrier fluid for pumps and compressors subsea, comprising an inlet (18) for barrier fluid at an inlet pressure, a first outlet (19) and a second outlet (15), the inlet pressure is higher than the first outlet pressure that is higher than the second outlet pressure. The pressure volume regulator is distinctive in that the inlet and the second outlet are interlocked between a movable longitudinal interlock member (5) with valve elements operatively arranged at either end, the length of the interlock member plus said valve elements is shorter than the distance between an open-close valve mechanism of the inlet and an open-close valve mechanism of the second outlet.

Abstract: Pressure volume regulator (20) for control of supply and pressure of barrier fluid for pumps and compressors subsea, comprising an inlet (18) for barrier fluid at an inlet pressure, a first outlet (19) and a second outlet (15), the inlet pressure is higher than the first outlet pressure that is higher than the second outlet pressure. The pressure volume regulator is distinctive in that the inlet and the second outlet are interlocked between a movable longitudinal interlock member (5) with valve elements operatively arranged at either end, the length of the interlock member plus said valve elements is shorter than the distance between an open-close valve mechanism of the inlet and an open-close valve mechanism of the second outlet.

Abstract: In aspects, a portable breathing apparatus is provided that includes a face mask having a breathing valve, a blower for the supply of breathing air to the breathing valve via a supply line, a filter device for cleaning of the breathing air from the blower, and a compressed-air reservoir for alternative supply of breathing air to the breathing valve. Additionally, the breathing valve is a demand valve configured to supply pressure equal to or above an ambient pressure, a check-valve is arranged on the upstream side of the blower, and the compressed-air reservoir is provided with a pressure control valve for establishing an overpressure above the ambient pressure in the entire breathing system, wherein the pressure control valve is upstream of the breathing valve and downstream of the check valve, so that gas or liquid cannot penetrate into the system when breathing gas is supplied from the compressed-air reservoir.

Abstract: A chamber having an internal volume, end surfaces and a side wall. The chamber is adapted to change its volume by leakage-free displacement of the end surface. The side wall has at least three adjacent sleeves (1-6), and an elastic seal (8-14) is arranged between each of the sleeves, such that the seals are pressurized and expanded when the sleeves are moved due to a displacement of the end surfaces.

Abstract: The invention is concerned with a chamber amending its volume by displacement free of leakage of a surface element constituting one of the end surfaces of the chamber. The side walls of the chamber comprise a selected number of sleeves which are connected free of leakage by means of elastic seal. The chamber according to the invention is characterized in that the volume of the chamber is amended when small differences occur in the balance between the forces effecting said surface element and that this property is effected very little of the difference between the internal and the external pressure of the chamber. The chamber according to the invention may be used to increase the efficiency of different products such as high pressure valves, pulsation dampener, piston pumps and such.

Abstract: A portable semi-closed breathing apparatus for divers, having a circuit comprising a breathing bellows (1) connected to a pressure gas source (2) for the supply of breathing gas, a demand-controlled breathing valve (20), an actuator (4) for expansion and contraction of the breathing bellows (1) in step with the diver's breathing pattern, a means (5) for compensation of consumed oxygen, and a means (6) for removal of CO2 from the breathing gas. The actuator (4) is a cylinder/piston unit (9, 10) having a first chamber (11) connected to a source (13) for compensation gas, and a second chamber (12) connected to a valve means (5). During the diver's exhalation phase the valve means (5) is arranged to supply compensation gas to said second chamber (12) under control of the breathing valve (20), so that the breathing bellows (1) expands and absorbs exhaled gas from the diver.

Abstract: A portable breathing apparatus comprising a face mask (1) having a breathing valve (2), a blower (4) for the supply of breathing air to the breathing valve via a supply line (3), a filter device (7, 8) for cleaning of the breathing air from the blower (4), and a compressed-air container (12) for alternative supply of breathing air to the breathing valve. The breathing apparatus is characterised in that the breathing valve (2) is a demand valve, that a check valve (9) is arranged on the upstream side of the blower (4), and that the compressed-air container (12) is provided with a pressure control valve (13) for establishing an overpressure in the entire breathing system upstream of the breathing valve (2) and downstream of the check valve (9), so that gas or liquid from the surroundings can not penetrate into the system.

Abstract: A method and a regulating valve for maintaining a fluid pressure within a defined volume (3), and simultaneous registering of discharge of fluid from the volume as a result of leakage or consumption. The fluid is supplied from a pressure regulating valve (20) provided with a means (5-7, 22-26) which opens for the supply of fluid to the volume (3) when the pressure therein has sunk below a first value (P1), and which shuts off the fluid supply when the pressure in the volume (3) has achieved a preset second value (P2) which is substantially higher than the first value (P1). Thus, after each opening of the regulating valve (20) there occurs a distinct pressure increase at the valve outlet. This pressure increase is registered as a pressure pulse, and the frequency of delivered pressure pulses is monitored and utilised as a measure of occurring leakage and/or consumption of the supplied fluid.

Abstract: A system for controlling the working conditions for mechanical pumps supplying associated devices with pressure fluid via a pipe system. A valve means (25) is placed between at least one of the pumps and an appurtenant device supplied by the pump, which valve means is arranged to open only when the pump has started up, and by adjustment of its flow cross-section seeks to maintain its downstairs pressure at a value (P3) which is predetermined from the specifications of the pipe system and said device, but gives priority to restrict its flow cross-section so that counterpressure of the pump does not fall below a given minimum value (P2) determined from the characteristic properties of the pump. The valve means is a regulating valve (25) operating in accordance with this functional principle.

Abstract: An arrangement in a fire water system, especially for an offshore platform, wherein the system comprises one or more fire water pumps (6) connected through a pipe system (2-5) to a number of deluge valves (812) coupled to associate with pipe stretches leading to respective fire sections. The arrangement comprises a distribution manifold (2) having an upstream side (3) which is in open connection with the fire water pumps (6) and with a buffer tank (7) for water, and having a downstream side (4) connected to the deluge valves (12) which are coupled to said pipe stretches, and there is also provided a gas supply means (10) connected to the buffer tank (7) and having a pressure which is sufficient to see to it that the water pressure at the upstream side of the distribution manifold does not sink below a predetermined level after activation of the deluge valves (12).

Abstract: A method and a regulating valve for maintaining a fluid pressure within a defined volume (3), and simultaneous registering of discharge of fluid from the volume as a result of leakage or consumption. The fluid is supplied from a pressure regulating valve (20) provided with a means (5-7, 22-26) which opens for the supply of fluid to the volume (3) when the pressure therein has sunk below a first value (P1), and which shuts off the fluid supply when the pressure in the volume (3) has achieved a preset second value (P2) which is substantially higher than the first value (P1). Thus, after each opening of the regulating valve (20) there occurs a distinct pressure increase at the valve outlet. This pressure increase is registered as a pressure pulse, and the frequency of delivered pressure pulses is monitored and utilised as a measure of occurring leakage and/or consumption of the supplied fluid.

Abstract: A protection system arranged to prevent a large trans-membrane pressure difference over a pressure sensitive membrane (4) fitted in a pressure resistant chamber (3), wherein the membrane forms a physical barrier between a liquid and a gas mixture carried through the chamber (3), the protection system includes two shut-off valves (9, 10) provided in the liquid inlet and outlet lines respectively, a buffer tank (3) provided in the line between one of the shut-off valves (9, 10) and the pressure resistant chamber (3), a pressure equalizing valve (12) provided between the gas inlet line (8) and the buffer tank (2) and a pressure sensing valve (14) for measuring the pressure difference over the membrane (4) and which activates the shut-off valves (9, 10) once this pressure difference exceeds a predetermined value.

Abstract: A method and a valve apparatus for counteracting harmful pressure pulses caused by rapid retardation of a liquid in a hydraulic system comprising a pump for the supply of liquid to a conduit stretch containing a non-liquid-filled volume. The valve apparatus comprises a main valve having an inlet connected to a reservoir for pressurised gas, a first valve chamber connected in use to said volume, and a regulating unit for controlling the supply of pressurised gas to the first chamber.

Abstract: A device for repairing damages or providing branchings on pipes, especially in existing underwater pipe installations, comprises a cylindrical, longitudinally divided muff (1) which is dimensioned to be placed around and clamped to the topical pipe (4) by a clamping means (6), a sealing means (18) being provided between the muff (1) and the surface of the pipe (4). At least one of the muff members (2, 3) is composed of a strong outer layer (10) and a less strong inner layer (11) which layers are joined so as to form an intermediate closed volume (14 and 15), said muff member (2 or 3) being provided with a means (17) for supplying a hydraulic pressure medium (19) to said volume, so that the volume when pressurized expands and the inner layer (11) and the sealing means (18) thereby are pressed to seating engagement with the adjacent surface of the pipe (4).

Abstract: A gas regulating valve, especially for use in breathing valves for diver masks and the like. The valve comprises a sleeve-shaped housing (1) having an inlet chamber (I) and an outlet chamber (II), a main valve body (2) cooperating with a seat (3) separating the inlet chamber (I) from the outlet chamber (II), a piston (12) or the like separating the outlet chamber (II) from a servo chamber (III), and a control valve (5,6) arranged to be opened and closed by the main valve body (2). The control valve (5,6) causes a controlled gas flow to the servo chamber (III), which entails that the main valve body (II) is forced to move such that the seat (6) of the control valve at all times rests sealingly against the valve body (5) of the control valve.

Abstract: A pressure regulating unit for supplying a pressurized fluid, especially breathing gas, to a user, which unit comprises a pressure regulator (3, 22-29) and a switching means (1, 9, 10, 13-20) for controlling the fluid supply from a preferential supply line (6) and an alternative supply line (8) to a common outlet (12) from the unit. The unit comprises a first chamber (13) which is in open connection (16) with the preferential supply line (6), and which contains a spring-actuated first sensing diaphragm (14) sensing the pressure in the preferential line (6) and being operatively connected to and driving the valve means (9, 10, 17-20).

Abstract: A closed or semi-closed breathing system for smoke diving and the like includes a pneumatically controlled breathing bag (1) communicating in a circulation (4, 5, 6) with a breathing mouthpiece or breathing mask (2) for a user and with an absorption means (3) for exhaled CO.sub.2, a pneumatic actuator (9) arranged for alternating expansion and contraction of the breathing bag (1) in accordance with the breathing pattern of the user, and a pressurized gas source (11) coupled to the breathing bag (1) to supplement the breathing gas therein. The system includes a mode regulator (10) arranged to control the actuator's actuation of the breathing bag (1) while simultaneously maintaining an overpressure in the breathing mask (2) in relation to the surroundings, and a dosing means (13) for the supply of a metered gas quantity to the breathing bag (1) in dependence on its degree of filling.

Abstract: An emergency breathing device for use of evacuation in connection with fires, chemical accidents or the like, and which comprises a heat-resisting and gas-tight protective hood (1) which is adapted to surround the head (2) of a user, and wherein there are arranged an oxygen supply unit having a reservoir (12) for the supply of oxygen to the breathing air in the hood, and a CO.sub.2 absorber (14) for purifying the breathing air. The hood (1) has double walls (3, 4) for providing a closed breathing bag (5) which is separated from the surrounding atmosphere and which is provided with a suitable positioned mouthpiece (7) for use by the user. Further, the oxygen supply unit comprises a dosing means (40) which is arranged to inject oxygen in accordance with the breathing frequency of the user.

Abstract: A flow regulator for maintaining a stable rate of flow of a fluid in a flow channel (2), comprising a flow-actuating element (4) which is movable under the influence of a pressure drop in the fluid flow, and a throttle valve (10) for regulating the fluid flow under the influence of said element (4). The fluid-actuated element (4) constitutes a control element for a servo means (11) comprising a pilot valve (17) for controlling the movement of a drive means (12) coupled to a valve body (19) in the throttle valve (10), and which, by means of the servo means (11), is arranged to be moved in a smooth manner independently of sudden changes in the fluid flow. The control element is influenced by a prestressed spring (9) acting in the opposite direction to the flow direction, so that the control element (4) is moved in the flow direction only when the rate of flow exceeds a preselected level.

Abstract: A testing apparatus for in situ calibration of various types of pressure gauges is provided for measuring absolute pressure, manometric pressure or differential pressure. The apparatus includes a reference chamber where a desired pressure can be established with very high accuracy. Pressure regulation is based on an output signal from a calibrated electronic pressure sensor connected to the reference chamber, and on a reference signal (V.sub.ref), these signals being supplied to an electronic control circuit which controls a regulating valve. The regulating valve controls gas pressure within the reference chamber so that the pressure is established on the desired valve.