Abstract:
Method and apparatus for generating a flow through a contained section, e.g. a pipe, below the surface of a body of water. Fields of application include coastal protection and energy production. The contained section is connected to valved mouths located beneath different points of the migrating wave profile, whereby a uni-directional flow is induced due to the differences between the hydrostatic pressures in these points. Various configurations of the system are described, including a perforated pipe enclosed by a flexible hose, which is attached at intervals to the pipe and supplied with slits.
Abstract:
A rigid piston assembly for use in a conventional flush valve includes a rigid piston and a solenoid configured to fixedly engage within the valve body. A flush valve for a plumbing fixture as well as a method of retrofitting a piston valve into a diaphragm flush valve body includes a rigid piston and solenoid configuration.
Abstract:
The invention provides a flushing apparatus (100), for a toilet or urinal, which includes a flushing mechanism, in the form of a flushing valve (2), and manual activation means (4) for activating the flushing valve (2). The flushing apparatus (100) also includes a sensor (41) for sensing, in use, a presence of a user proximate the toilet or urinal and a sensed activation means, in the form of a solenoid valve (45), activatable by the sensor (41), for activating the flushing valve (2). The flushing valve (2) includes a pressure chamber (29) depressuriseable by the manual activation means (4) and the solenoid valve (45) in order to activate the flushing valve (2). The invention extends to a kit for retrofitting a flushing apparatus having manual activation means, for a toilet or urinal.
Abstract:
A rigid piston assembly for use in a conventional flush valve includes a rigid piston configured to fixedly engage within the valve body. The present invention is also directed to a flush valve for a plumbing fixture as well as a method of retrofitting a rigid piston into a diaphragm flush valve body.
Abstract:
In one embodiment, a mains pressure valve has a body (10) and a main valve component (17) which is movable to effect opening and closing of the mains pressure valve. A flow controller (36) is disposed downstream of the main valve component and has a downstream end. At least one air vent (38) is provided downstream of the downstream end of the flow controller (36) and the vent is shielded from the downstream end of the flow controller (36). In another embodiment, there is a main chamber (12) within which the main valve component (17) moves, the main chamber having a control portion (40). A bypass passageway (13) has an upstream end (35) from the control portion (40) of the main chamber and a downstream end (46). A control valve (42) controls the flow through the by-pass passageway (13) to control the operation of the mains pressure valve. The downstream end (46) of the bypass passageway (13) is downstream of the flow controller (36). In a further embodiment, an upstream portion of the bypass passageway (13) is defined within a manifold (25).
Abstract:
A mains pressure valve which comprises a main chamber (12) having an inlet chamber (11) for fluid and a discharge chamber (14) for fluid; a piston (17) located in the main chamber (12) which is movable into and out of sealing engagement with the outlet of the main chamber (12) and which defines above it an upper portion (40) of the main chamber (12); a port (35) in the upper portion (40) which permits fluid to flow therethrough; and actuation control (42) associated with the port to regulate the flow of fluid through the port. Upon actuation fluid in the upper portion (40) drains through port (35) allowing piston (17) to rise and mains pressure fluid passes from inlet chamber (11) through main chamber (12) and out discharge chamber (14). Fluid bleeds via flow valve (21) and (22) into upper portion (40) and as port (35) is closed piston (17) closes the valve after a predetermined period.
Abstract:
Piston structure having a first side and a second side and in a recess (6) formed in an outer portion of the piston (1, 22) a resilient sealing element (5, 11, 21) is placed. The axial width and at least in some places the radial depth of the recess (6) are greater than the cross-sectional diameter of the sealing element (5, 11, 21) which is able to move, owing to the pressure difference of the two sides, between a first and a second position, thereby alternately ensuring a cumulated cross-sectional area at most A1, and a cross-sectional area A0, or a cumulated cross-sectional area at most A2, and a cross-sectional area A0. A1 and A2 are substantially smaller than A0. The invention further relates to a liquid feeder valve including this piston structure for allowing liquid flow-through in a certain amount or for a period of time from a pressurized source of liquid.
Abstract:
A stop valve capable of contributing to the stabilization of operating responsiveness, comprising a housing having a water inlet port and a water outlet port, a piston installed in the housing so as to be moved slidably in axial direction by the external operation of a shaft, and a pressure offset means offsetting a pressure applied to the other side of the piston from the washing water in the water outlet port, the pressure offset means further comprising a pressure offset chamber formed on one side of the piston and a passage allowing the other side of the piston to communicate with the pressure offset chamber, wherein the piston is slid in one axial direction so as to close a communication of the water inlet port with the water outlet port by seating on the seat face of the housing and slid to the other axial direction so as to open the communication of the water inlet port with the outlet water port by moving apart from the seat face.
Abstract:
A mains pressure flusher valve (10) which includes a valve body (8) defining (i) a main chamber (12) having a main inlet for fluid and a main outlet for fluid (9) and (ii) a discharge chamber (14) extending downstream from the main outlet (9), the discharge chamber (14) being adapted to be connected in use to a flush pipe (48); a piston (17) located in the main chamber (12) which is movable into and out of sealing engagement with the main outlet (9); a non-return valve (36) located in the discharge chamber (14) having a mouth at its upstream inlet and a outlet, the non-return valve (36) adapted to inhibit fluid flowing from the downstream side of the non-return valve (36) to any part of the mains pressure flusher valve upstream of the non-return valve; sealing means (46) to inhibit fluid in the discharge chamber (14) from escaping, in use, to an external surface of the flush pipe (48); a subsidiary passageway (13) having (i) a first portion with an entry for fluid in fluid communication with an upper portion (40) of the main chamber (12) above the piston (17), (ii) a control valve to permit flow of fluid through the subsidiary passageway (13) and (iii) a second portion (13a) adjacent to the discharge chamber with an outlet for fluid into the discharge chamber (14), the outlet for fluid located downstream of the main outlet (9) and upstream of, and spaced from, the sealing means (46).