A two-stage switch valve includes a valve body slidable in a flow passage of a fluid, and a spring urging the valve body upstream. The valve body includes a valve element slidable in the flow passage, an upstream guide having a ring shape and being slidable in the flow passage, and legs connecting the valve element and the upstream guide. The upstream guide is located upstream of the valve element. The legs are inclined from an axial direction of the upstream guide and extend from the upstream guide toward a center of the valve element.

A two-stage switch valve includes a valve body slidable in a flow passage of a fluid, and a spring urging the valve body upstream. The valve body includes a valve element slidable in the flow passage, an upstream guide having a ring shape and being slidable in the flow passage, and legs connecting the valve element and the upstream guide. The upstream guide is located upstream of the valve element. The legs are inclined from an axial direction of the upstream guide and extend from the upstream guide toward a center of the valve element.

There is provided a shut-off valve including: a valve body part having a valve body surface; a valve seat part provided around an inlet, and having a valve seat surface disposed at a position opposite to the valve body surface; and a moving mechanism that is connected to the valve body part, and moves the valve body part in a direction of an axis to switch to either a shut-off state or a circulation state, wherein the valve seat part has an endless inner peripheral side projection and an endless outer peripheral side projection that project from the valve seat surface toward the valve body surface along the axis, and the valve body part has a diaphragm forming the valve body surface, and an elastic member disposed on a back surface of the diaphragm.

There is provided a shut-off valve including: a valve body part having a valve body surface; a valve seat part provided around an inlet, and having a valve seat surface disposed at a position opposite to the valve body surface; and a moving mechanism that is connected to the valve body part, and moves the valve body part in a direction of an axis to switch to either a shut-off state or a circulation state, wherein the valve seat part has an endless inner peripheral side projection and an endless outer peripheral side projection that project from the valve seat surface toward the valve body surface along the axis, and the valve body part has a diaphragm forming the valve body surface, and an elastic member disposed on a back surface of the diaphragm.

A flow control valve providing a constant outflow in a variable inflow fluid pressure environment from as low as 0 bar and at least up to 6 bar. The flow valve comprises a flow control surface that features at least one flow control opening for controlling the outflow through the valve. The flow control opening configured to have a triangular-like polygonal configuration.

A flow control valve providing a constant outflow in a variable inflow fluid pressure environment from as low as 0 bar and at least up to 6 bar. The flow valve comprises a flow control surface that features at least one flow control opening for controlling the outflow through the valve. The flow control opening configured to have a triangular-like polygonal configuration.

A drip emitter has a flexible membrane for regulating a flow of liquid exiting the emitter. The membrane, in a non-stressed or non-flexed state into a regulating chamber of the emitter, includes a non-planar portion.

A ventilation flow rate regulator for a pressurised tank of a vehicle. The regulator includes a body including a gas inlet and a gas outlet, and at least one restrictor mounted movably relative to the body. The restrictor is mounted to reduce a cross-section of at least one path of a gas flow proceeding from the inlet to the outlet, when a flow rate at the inlet is greater than a predetermined threshold. The regulator is arranged so that the cross-section remains non-zero irrespective of a flow rate.

A ventilation flow rate regulator for a pressurised tank of a vehicle. The regulator includes a body including a gas inlet and a gas outlet, and at least one restrictor mounted movably relative to the body. The restrictor is mounted to reduce a cross-section of at least one path of a gas flow proceeding from the inlet to the outlet, when a flow rate at the inlet is greater than a predetermined threshold. The regulator is arranged so that the cross-section remains non-zero irrespective of a flow rate.

A hydraulic valve is disclosed comprising a venting passage for allowing fluidic communication between an interior and an exterior of the hydraulic valve, the venting passage having a first portion following a first path extending in a first plane, and a second portion following a second path extending in a second plane, wherein the first plane is at an angle to the second plane, and wherein the first and/or second path is a labyrinth path in its respective plane.