A first valve mechanism is a valve mechanism provided in a flow path coupled to a liquid ejecting head that ejects a liquid, and including a valve that opens/closes the flow path, a first communication liquid chamber that communicates with the flow path, and a first pressure receiving body that converts a pressure difference between a pressure of the first communication liquid chamber and a reference pressure into an operating force of the valve, in which a threshold pressure of the first communication liquid chamber for determining opening/closing of the valve is variable.

The present invention relates to a liquid metering device (1) for metering pumps which is formed by a main longitudinal conduit (2) with a first and second opposite ends (2.1, 2.2) comprising a fluid inlet (3) at the first end (2.1) located perpendicular thereto, a first outlet (4) at the second end (2.2), and a first connection (5) to backpressure control means (6), a second connection (7) to safety means (8), acting in parallel and in an independent manner, and a second overpressure outlet (9), arranged in one and the same connecting section (10), and where said connecting section (10) has an inclined wall (11) allowing the fluid to exit through the first outlet (4) for a fluid pressure equal to or greater than a fixed backpressure value and the fluid to exit through the second outlet (9) for a pressure greater than a fixed value.

Pressure reducer (10) having a housing (11) with a valve (12) positioned in said housing (11), wherein in closed position the valve (12) separates an inlet pressure chamber (13) of the housing (11) from an outlet pressure chamber (14) of the housing (11), and in open position connects the inlet pressure chamber (13) and the outlet pressure chamber (14), wherein the valve (12) has a diaphragm (16) acting on a valve tappet (15), on which diaphragm, by providing a pressure reducing function, a spring force of a spring element (17) acting in the opening direction of the valve (12) acts on the one hand and a force that is a function of the pressure prevailing in the outlet pressure chamber (14) acting in the closing direction of the valve (12) acts on the other hand, wherein the valve (12) has, attached to the valve tappet (15), a valve body (21) which, in closed position, bears against a valve seat (22) in a sealing manner and which in open position is raised off the valve seat (22), and wherein the spring element (17) is arranged between spring plates (18, 19), namely between a spring plate (18) facing the diaphragm (16) and a spring plate (19) facing away from the diaphragm (16). A sensor (27) for detecting leakage is integrated into the pressure reducer.

Setting device for a pressure regulator includes a tubular casing developing according to a longitudinal axis (X) and in which there are a movable body, a sliding setting plate and a spring interposed between them; an adjusting unit suited to adjust the position of the setting plate and having a first rotating shaft connected to the setting plate through a screw mechanism which converts opposite rotations of the first shaft into corresponding opposite movements of the setting plate along the longitudinal axis (X), and an electric motor powered by a control device and provided with a second shaft constrained to the first shaft. The control device includes two different input lines to receive corresponding electric signals and an output line to supply power to the electric motor and is configured to transmit an electric pulse emitted by any of the input lines to the output line with polarity depending on the input line which emitted the electric pulse.

A unit for regulating or controlling a fluid pressure has a valve housing with an inlet and an outlet. A switching film is disposed in the valve housing and switches at pressure differences of 1 mbar to 250 mbar for regulating, opening or blocking a flow of a fluid from the inlet to the outlet. The switching film is formed of a fluorine and carbon containing polymer material. The switching film has a plate-shaped flat body with a bending region and has a central closure region surrounded by the bending region. The bending region, when switching the switching film, moves the central closure region relative to a valve seat of the valve housing in an axial direction of the plate-shaped flat body toward or away from the valve seat by a low-stretch bending movement. A switching film for such a unit is provided also.

A pressure regulator, said pressure regulator comprising a housing containing a channel arranged to communicate a fluid from a fluid inlet to a fluid outlet, said channel comprising a valve seat housing, a valve seat and closure member with said closure member operable with the valve seat and valve seat housing to control flow through the channel; wherein the housing comprises a resilient diaphragm in fluid communication with the fluid and in physical communication with the closure member such that the diaphragm is operable to deform in response to a change in pressure of the fluid and such that deformation of the diaphragm causes the closure member to change position, and; wherein the section of the diaphragm not in fluid communication with the channel, is in fluid communication with the exterior of the regulator via a vent aperture and; wherein the closure member comprises an upstream valve element and downstream valve element, wherein the downstream valve element is a ridge operable with an aperture in the valve seat housing to at least partially control fluid flow, wherein said ridge of the closure member is partially or fully inside said aperture in the valve seat housing when the upstream valve element of the closure member is at or between the fully open position and a predetermined partially open position with the valve seat, to provide a restriction to fluid flow but not to fully obstruct flow.

A control line stabilizer includes a body defining an inlet chamber, an outlet chamber, a passageway connecting the inlet chamber and the outlet chamber, a first seat, and a second seat. A disc is disposed in the passageway and is movable between a first closed position, in which the disc engages the first seat, an open position, in which the disc is spaced away from the first seat and the second seat, and a second closed position in which the disc engages the second seat. A first spring is disposed in the outlet chamber and is operatively coupled to the disc. A second spring is disposed in the inlet chamber and is operatively coupled to the disc. The disc restricts fluid flow through the passageway by moving to the first closed position and by moving to the second closed position.

A one-gauge one-turn regulator manifold includes a manifold body, a spring set, a knob set, an annular dial and one inlet pressure gauge. The outlet pressure is selected and adjusted by turning a control knob without a pressure gauge. The control knob with a marker indicating the outlet pressure from zero to maximum is rotatable within one turn. The knob set contains one adjusting screw which is used to fine-tune the pressure, and thus the outlet air pressure is calibrated as expected. The annular dial with pressure tick marks is located between the control knob and the manifold body. The outlet pressure is easy to selected and controlled by turning the knob to the desired pressure makers on the dial without the pressure gauge.

A method to operate a pressure regulator including an inlet flow passage and an outlet flow passage; a plunger reciprocally between the inlet and outlet flow passages, wherein an axis of the plunger is offset from an axis of the inlet flow passage and the plunger moves with respect to a stationary valve seat to regulate pressure of liquid flowing through the pressure regulator.

A first valve mechanism is a valve mechanism provided in a flow path coupled to a liquid ejecting head that ejects a liquid, and including a valve that opens/closes the flow path, a first communication liquid chamber that communicates with the flow path, and a first pressure receiving body that converts a pressure difference between a pressure of the first communication liquid chamber and a reference pressure into an operating force of the valve, in which a threshold pressure of the first communication liquid chamber for determining opening/closing of the valve is variable.