A sliding metal seal valve comprises one or more non-circular (oblate) metal seals. Use of non-circular (oblate) sliding metal seals, permits the rotor of a rotary sliding metal seal valve to have a smaller diameter which permits a smaller overall valve size. Reduced rotor diameter also reduces the torque required to turn the rotor, permitting smaller actuator motors to be used. Axially sliding valves such as bar valves may also employ such non-circular sliding metal seals to permit a reduction in the width of such valve.

A method of pressurization and evacuation of a system including during a pressurization phase; introducing a pressurized gas stream into the top valve, which is actuated to direct the pressurized gas stream into the bottom valve, wherein the bottom valve is actuated to direct the pressurized gas stream to the customer apparatus; and during a vacuum phase; introducing the pressurized gas stream into the top valve, which is actuated to direct the pressurized gas stream into the inlet port of the pressure inlet of the educator, thereby producing a low pressure condition in the suction inlet, introducing a customer gas stream into the bottom valve, which is actuated to direct the customer gas to exit the bottom valve, wherein the low pressure condition causes the customer gas stream to be directed to the educator suction inlet, wherein it mixes with the pressurized gas stream and exits the educator discharge outlet.

The servovalve incorporates a rotating plate valving element which connects between the valve ports through cavities formed inside it. The valving element cavities are formed symmetrically in both the valving elements sides, where each pair of symmetrical cavities is optionally separated by a stiffening web. Holes through the webs connect between the symmetrical cavities. The control orifices are formed between some edges in the valving element cavities and edges of cavities in adjacent fixed elements surrounding the valving element and properly designed for this purpose. The flow ducts inside the valves are formed by the cavities in the valving element and the adjacent parts to provide enough flowing cross sectional areas. The control orifices are formed in pairs at both valving element sides to duplicate the area and provide symmetry for flow forces lateral components balance. Each portion of the valving elements is subjected to the same pressure at its both sides to provide static balance. The rotational movement generates relatively large control orifice from rotary or linear drivers of short strokes. Thin valving elements with cavities provide lowest inertia for high speed of response.

Electric valve and a refrigerating system. An inlet, a pressure relief port and a plurality of outlets are set on a valve seat of the electric valve; a valve cap is covered above the valve seat; an electric motor is fixedly set on the valve cap, a stator of the electric motor is set on the outer surface of the valve cap, and a rotor is set in the intracavity of the valve cap; the lower end of a mandrel is fixedly provided with a valve core that is opened with a pressure-relief diversion slot and a through slot, wherein the pressure-relief diversion slot is opened on the lower surface of the valve core, the through slot penetrates through the valve core along the thickness direction of the valve core. Refrigerant bifurcation, cutoff, pressure relief, etc., in refrigerating system is realized by rotating the valve core to different positions.

A downhole hydraulic control tool comprising a substantially tubular body adapted for connection in a tubing string, the body including a throughbore arranged coaxially with a bore of the tubing string and one or more pockets arranged on a wall of the body, the pockets including a hydraulic power source and at least two control lines, wherein the device includes a pump to drive hydraulic fluid through the control lines and a switchable flow mechanism for switching the flow of pumped fluid between the at least two control lines, and a switchable flow mechanism and a method of operating one or more downhole devices from a downhole located hydraulic control tool.

A leveling valve for discharging and supplying air from and to a plurality of utilization elements comprises a valve disc arrangement configured to direct air between a source of pressurized air, an exhaust port, and the utilization elements. The valve disc arrangement comprises a first and a second valve disc, which are rotatable with respect to each other such that the valve is switchable between multiple switching positions, and, in some switching positions, either the source of pressurized air or the exhaust port are in fluid communication with the utilization elements. The valve discs provide a stepped increase in flow cross-section in a respective flow path to or from the utilization elements. The stepped increase is dependent on the angle of rotation between the valve discs.

Distributing, opening and closing device for taps, has an inlet chamber, an outlet chamber to the shower column/head or to the shower hose, an outlet chamber to the shower hose or the shower column/head, a discharge opening and a water regulator with the functions of opening, intermediate closing and closing/discharging in one single mechanism, the water regulator being connected to the chambers of the distributing device, and being regulated via an actuating control with several positions, diverting the water, depending on the actuating rotation, to the corresponding chamber or discharge opening of both, thus releasing the water retained in the feed pipes in order to eliminate uncontrolled discharges of water, dripping or the formation of bacteria that are commonly generated in stagnant water, such as legionella.