Flow control valves may be positioned downstream of water meters to increase pressure and compress entrained water vapour passing through the meters. However, turbulence within such valves can cause the valve's head to move radially, bending a shaft within the valve which may break. Accordingly, there is provided a flow control valve comprising: a housing having a flow passage; a valve seat defined within the flow passage; a valve head moveable to a closed position to engage the valve seat and seal the flow passage; a shaft secured to the valve head; a support slidingly mounting the shaft within the housing; a spring biasing the valve head to the closed position and configured to maintain the valve head in the closed position until a predetermined pressure is applied; and a guide assembly extending along at least a portion of the flow passage to constrain radial movement of the valve head.

The systems and methods of the present disclosure provides an independent passive variable resistor that can be interposed between a fluid reservoir at an inlet pressure and receptacle at an outlet pressure. The resistor can adjust resistance to the pressure difference from the input to the output so that the flow rate through it is a constant rate. The resistor can include a moveable element and a biasing mechanism located in a chamber to create a flow channel. Each side of the moveable element is exposed to the inlet and outlet pressures and moves within the flow channel to modify the resistance of the flow through the chamber in response to the pressures. The balance of these forces determines the position moveable element, which interacts with the fluid channel to determine the flow resistance through variable resistor. The biasing mechanism can provide the necessary pressure to establish equilibrium flow rate.

A pressure relief valve (10) in a hydraulic tensioner for an endless loop power transmission member and method of assembly can include a check valve member (18) positioned within a fluid passage (14) defined by a housing (12) for movement toward and away from a valve seat (16) defined by the housing (12), a spring (20) normally biasing the check valve member (18) toward the valve seat (16), and a spring retainer (22) assembled within the fluid passage (14) to a variable depth in response to feedback pressure for automatically adjusting a biasing force of the assembled spring (20) to compensate for tolerances effecting a relief pressure value of an assembled pressure relief valve and allowing control of the relief pressure value to be within a predetermined range with respect to a predetermined target relief pressure value for driving the check valve member (18) away from the valve seat (16).

A break check valve includes a valve body defining a mating surface and a valve inner cavity; a pivot pin positioned inside the valve inner cavity and secured to the valve body, an axis of the pivot pin offset in a radial direction with respect to a longitudinal axis of the valve body; and a valve member positioned within the valve inner cavity and configured to rotate about the pivot pin from an open position to a closed position of the valve, the valve member comprising a plate and an arm extending from the plate, the valve member configured to remain in the open position of the valve as long as a mating surface of a hydrant remains in contact with the mating surface of the valve body and configured to close when the mating surface of the hydrant is separated from the mating surface of the valve body.

In a valve member, supply and discharge apertures of fluid are formed at a body having a fluid space E. A one electrode Da including a contact T is provided at an aperture edge of the supply aperture and/or a peripheral part of an aperture edge of the body. The body includes another electrode Db, and stores a valve member made of a conductor and opening and closing the supply aperture, and a coil spring made of a conductor and urges the valve member. A guide member made of a conductor is attached onto the valve member. The guide member is formed to secure a flow path of the fluid from the supply aperture to the discharge aperture while being slidable in the fluid space E, has a reception surface facing one end face of the fluid space E while receiving the fluid from the supply aperture.

Disclosed herein is a valve plug (10) comprising a valve plug body (11); one end surface of the valve plug body (11) is configured as a sealing surface (111), and the other end surface of the valve plug body (11) facing away from the sealing surface (111) is provided with a step (12); an outer diameter of the valve plug body (11) gradually increases from the one end surface to the other end surface, and the sealing surface (111) of the valve plug body (11) can be of various shapes such as a spherical surface, a conical surface, or a flat surface. The valve plug is simple in structure, and can shorten the sealing response time, increase the working effect of a high-pressure pump, and reduce the machining difficulty while ensuring the sealing effect. Also disclosed are a high-pressure pump structure and a valve plug sealing method.

A wiper arm adapter device with at least one fluid channel (44a, 46a; 44b, 46b) for conducting a fluid, and with at least one connecting unit (48a; 48b) for connecting the fluid channel (44a, 46a; 44b, 46b) to a fluid line element (36a; 36b) of a wiper arm and/or to a wiper blade adapter (30a; 30b), wherein the connecting unit (48a; 48b) has at least one connecting element (52a, 54a; 52b, 54b) which at least partially delimits the fluid channel (44a, 46a; 44b, 46b). The connecting unit (48a; 48b) has at least one valve element (56a, 58a; 56b, 58b) which is arranged on the connecting element (52a, 54a; 52b, 54b) and is configured to form the fluidic connection of the fluid channel (44a, 46a; 44b, 46b) to the wiper blade adapter (30a; 30b) in a closeable manner.

An electromagnetic induction continuous-flow water heater, in particular an automatic beverage vending machine is provided. The heater includes: a tubular body having a longitudinal axis and at least one inlet, configured to receive water to be heated and to feed it, in use, into the tubular body, and an outlet, through which the heated water flows out of the tubular body; and an electrical winding wound around the tubular body and electrically powerable to generate an electromagnetic induction field. The tubular body is made of an electrically conductive material heated by electromagnetic induction. The heater further includes an insert housed inside the tubular body and extending along the longitudinal axis with the tubular body and the insert delimit at least between an external surface of the insert and an internal surface of the tubular body, a helical flow channel for the water, which extends helically around the longitudinal axis.

A fluid pressure regulator includes at least one fluid inlet conduit for connection to a pressurised fluid source, an outlet conduit. and an elastically expansible chamber arranged between the at least one fluid inlet conduit and the outlet conduit. The elastically expansible chamber being configured to elastically deform the at least one fluid inlet conduit upon expansion to modify the cross sectional area of the at least one fluid inlet conduit.

Flow control valves may be positioned downstream of water meters to increase pressure and compress entrained water vapour passing through the meters. However, turbulence within such valves can cause the valve's head to move radially, bending a shaft within the valve which may break. Accordingly, there is provided a flow control valve comprising: a housing having a flow passage; a valve seat defined within the flow passage; a valve head moveable to a closed position to engage the valve seat and seal the flow passage; a shaft secured to the valve head; a support slidingly mounting the shaft within the housing; a spring biasing the valve head to the closed position and configured to maintain the valve head in the closed position until a predetermined pressure is applied; and a guide assembly extending along at least a portion of the flow passage to constrain radial movement of the valve head.