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1. (WO2018224734) INLET VALVE FOR COMPRESSOR PRESSING GASEOUS MEDIUM, COMPRESSOR AND METHOD FOR CONTROLLING THE INLET VALVE OF THE COMPRESSOR
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CLAIMS

1 . Inlet valve for a compressor pressing gaseous medium, which inlet valve comprises

- a casing (1 );

- an inlet channel (9) that is formed through the casing for bringing gaseous medium into the inlet valve, to its inlet side;

- an outlet channel (10) that is formed through the casing for removing gaseous medium from the inlet valve, from its outlet side;

- a cylinder space (7) that is arranged at least partly inside the casing (1 );

- a piston (4) that is arranged to be moved in the cylinder space (7) in a first direction, i.e. towards the inlet channel (9), and in a second direction, i.e. away from the inlet channel (9);

- two or more flow paths (5, 6, 17) for control medium that are formed through the casing (1 ) into the cylinder space (7) for conducting control medium into the cylinder space (7) and out of it, and thereby for moving the piston (4);

- a shut-off means (2) for regulating and for closing the flow of gaseous medium, which shut-off means (2) is arranged to be moved by means of the piston (4),

characterized in that

- at least one flow path for control medium is a seepage flow path (17) that is connected to the cylinder space (7) in such a way that during regulation and closing of the shut-off means (2) the pressure of the control medium on the seepage flow path (17) is lower than in the cylinder space (7).

2. Inlet valve according to claim 1 , characterized in that inside the casing (1 ), between the cylinder space (7) and the inlet channel (9), is a slide surface (14) supporting the piston (4) at the clearance (19) distance from the outer surface (18) of the piston (4), and in that the seepage flow path (17) is connected to the cylinder space (7) via the clearance (19).

3. Inlet valve according to claim 2, characterized in that the seepage flow path (17) is arranged to lead from the clearance (19) of the slide surface (14) and the outer surface (18) of the piston to outside the cylinder space (7).

4. Inlet valve according to claim 1 , 2 or 3, characterized in that the seepage flow path (17) is arranged to conduct control medium out of the cylinder space (7) during regulation and closing of the shut-off means (2).

5. Inlet valve according to any of the preceding claims 2-4, characterized in that in connection with the slide surface (14) is a seal (1 5) that is arranged to seal the clearance (19) between the slide surface (14) and the outer surface (18) of the piston.

6. Inlet valve according to claim 5, characterized in that the seepage flow path (17) is connected to the cylinder space (7) via the clearance (19) between the seal

(15) and the cylinder space (7).

7. Inlet valve according to any of the claims presented above, characterized in that the inlet valve comprises an outlet channel (24) that is arranged to lead out of the cylinder space (7), typically from the top part of it, into the seepage flow path (17).

8. Inlet valve according to any of the preceding claims, characterized in that the seepage flow path (17) leads to the reservoir line for control medium, in which line the pressure is lower than the control pressure prevailing in the cylinder space (7).

9. A compressor comprising an inlet valve, the outlet channel (10) of which inlet valve is connected to the suction orifice (21 ) of the compressor, characterized in that the inlet valve is according to any of the preceding claims 1-8.

10. Method for controlling the inlet valve of a compressor pressing a gaseous medium, which method comprises at least the following phases:

- gaseous medium is brought into the inlet valve, to the inlet side, into the inlet channel (9) of the inlet valve;

- gaseous medium is removed from the outlet side of the inlet valve, from the outlet channel (10) of the inlet valve;

- the piston (4) is moved in the cylinder space (7) of the inlet valve, said cylinder space being arranged at least partly inside the casing (1 ) of the inlet valve, in a first direction, i.e. towards the inlet channel (9), and in a second direction, i.e. away from the inlet channel (9);

- the inlet channel (9) is, if so desired, closed with a shut-off means (2) that is operatively connected to the piston (4) in such a way that it moves along with the movement of the piston (4);

characterized in that

- control medium is conducted along a first flow path (5, 6) for control medium through the casing (1 ) of the inlet valve into the cylinder space (7) and along a second flow path, i.e. a seepage flow path (17), away from the cylinder space (7) at a lower pressure than the control pressure of the cylinder space (7), and thereby the piston (4) and shut-off means (2) are moved by controlling the pressure of the control medium in the cylinder space (7).

1 1 . Method according to claim 10, characterized in that control medium is conducted from the cylinder space (7) into the seepage flow path (17) via a throttle and along the seepage flow path (17) to outside the inlet valve.

12. Method according to claim 10 or 1 1 , characterized in that control medium is conducted via the clearance (19) between the slide surface (14) between the cylinder space (7) and inlet channel (9) and the outer surface (18) of the piston into the seepage flow path (17) to outside the cylinder space (7) and thereby the pressure exerted on the clearance (19) and on the piston (4) seal (15) disposed in the clearance (19) is reduced, and in that control medium is conducted along the seepage flow path (17) onwards into a space that is under lower pressure than the cylinder space (7), such as into the reservoir line and/or the control medium reservoir.

13. Method according to claim 10, 1 1 or 12, characterized in that control medium and/or the gas in it is conducted from the cylinder space (7) into the seepage flow path (17) via a separate outlet channel (24).

14. Method according to any of claims 10-13 presented above, characterized in that, during regulation and closing of the shut-off means (2), a part of the control medium is conducted from the cylinder space (7) into the seepage flow path (17) as an essentially continuous flow, and another part of the control medium is con-ducted to control the piston (4).

15. Method according to any of claims 10-14 presented above, characterized in that the temperature of the structures of the inlet valve are adjusted by conducting control medium at the desired temperature via the clearance (19) and, if neces-sary, also via a separate outlet channel (24) from the cylinder space (7) into the seepage flow path (17).

16. Method according to any of claims 10-15 presented above, characterized in that fluid medium, preferably hydraulic oil, is conducted as a control medium into the cylinder space (7) of the inlet valve and out from it.